By George A & Wallen, I Eugene (Eds) Llano
About The Product
Published by way of the yank Geophysical Union as a part of the Antarctic study Series.
Of the volumes presently on hand within the Antarctic study sequence, this quantity is the fourth facing the biology of the antarctic seas. those amassed papers contain the result of unique investigations, eleven of that are involved usually with the id and distribution of marine vegetation and animals. within the first of those papers Stewart Springer provides a scientific appraisal of the 5 species of elasmobranch Rajidae from Antarctica, of which one represents a brand new and specific species. Heretofore one of many peculiarities of the antarctic ichthyological fauna has been the absence of sharks. during this very major contribution, the writer establishes the main southerly checklist for any member of the elasmobranchs. the second one paper, through Patricia Kott, amplifies our systematic wisdom of the tunicates of the South Atlantic, South Pacific, and Indian oceans. It extends her monograph released as quantity thirteen of the learn sequence less than the name of Antarctic Ascidiacea and is predicated on collections made within the Antarctic via 1967; new species are integrated. Additions and corrections to quantity thirteen are appended to this paper. John C. Markham reviews on numerous reduce chordates of the genus Cephalodiscus and discusses the systematics and distribution of the 5 species identified from the Antarctic. The Deep Freeze fabrics tested during this research have been received in the course of the U.S. military Hydrographic place of work oceanographers from icebreakers assigned to activity strength forty three sooner than and after the 1955-1959 foreign Geophysical yr and precede the nationwide technology beginning subsidized examine now being performed by way of the USNS Eltanin and the R/V Hero below the U.S. Antarctic study application.
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740 (384494 meters). narrow stigmatain the branchialsac,he qualifiesthis Distribution. The previouslyrecordedmaximumdepth statement by sayingthat the inner detailsof the thorax for this specieswas 439 metersoff the Knox Coast are not certain. Van Name  has also drawn [Kott, 1969]. The new record from Eltanin Sta. 1545 attention tothefactthatMichaelsen hasnotrepre-considerably extends this depth range. 11]. In viewofthesimilarity in sizeand Description. Zooids openaround theborder of theupper rowsof stigmata wasnotdiscernible.
There is a thick layer of layer in the roof of the commoncloacalcavity. The bladdercellsin the surfacetest. There are alsolarge spiculesare stellateand fairly large, althoughthey stellate spiculesaround the anterior ends of the vary considerablyin size. There is an especiallyexzooids. In somespecimens there is an accumulation tensiveposterior abdominalcommoncloacal cavity of pigmentat the anteriorend of the endostyle,and into which the zooidsopen directly. Theseopenings in one colonythis is accumulated into a distinctpig- are sometimeslined by spicules,indicating 5-lobed ment spot.
There are 8 to 10 developing embryosin the peribranchial cavity,and obliquestomach foldsand,as is usualfor the species, the form of the colony. theseare broken and interruptedalong their length. Thetestis lobes areclustered intheposterior abdo- Aplidium scabellum (Michaelsen) men. Numerous eggsare presentin the ovary,and ,4maroucium scabellum Michaelsen, 1924, p. -thereare embryosprotrudingfrom the posterodorsal Brewin,1956,p. 124. corner ofthethorax in contracted specimens. Thesespecimens are typicalof the species.
Biology of the Antarctic Seas IV by George A & Wallen, I Eugene (Eds) Llano