OF THE KERGUELEN REGION OF THE GREAT SOUTHERN OCE.^N. 



475 



Coretliroti splew.lens, Eattray. 

 llemicmlu-s antarctirns, Ehreuberg. 

 AdinofijrluH oJiverianu-i, O'Meara. 



,, „ forma minor. 



AaferompJtalus hroolei, Bailej'. 



,, ■ liooh'rii, Ehrenberg. 

 Baderia--strum varians, Lauder. 



Coscinodiscnn africann.<, Janisch, vav. ictUic/tiana, 

 Grunow. 



„ anguste-lineatu-f, A. Schmidt. 



„ i-onvexus, A. Schmidt. y 



Cosi'inodi^cus denariits, A. Schmidt. 

 ,, exceiitriaif, Ehrenberg. 



„ kutzimjii, A. Schmidt, var. ijlariali.-t, 



Grunow. 

 „ le)iii<^inofu.<, .Jauiseh. 



„ liiteatus, Ehrenberg. 



„ luna; Ehrenberg. 



„ mavtjaritaceus, Castracane. 



,, oadvs-iri'lis, Ehrenberg. 



,, .««Wi7/.--, Ehrenberg. 



,, funiidu<, Janisch. 



LIST IX'.-. 



The following 26 species occur both in the surface gatherings and in the deposits at 

 the bottom within this region : — 



Navicida a-ipcru. 

 „ subtilis. 

 Syntdra liineeohtta. 

 TludassiothrLc loiujissima. 

 TrachijiiplMt ia a ustralii. 

 Frayilaria (?) iui Terebraria (?) sp. 

 lihisosoleniti setiyera. 



„ .itylifurmit. 



Melosim sp. (?). 

 Covdhron criophUuni. 

 Hemiaidus aniarciicun. 

 Adlnocycliis oliveria iihs. 

 Asteromphalus hronkei. 



AderompUalu-i huokirii. 

 Coscinodisciu african u-i. 



„ con vexiis. 



„ denarius. 



„ excentricus. 



„ kutxingii. 



„ leiitiginosits. 



„ lineatus. 



„ lun(c. 



„ maryaritMeus. 



„ octdus-iridif. 



., suhtilis. 



,, tumiduJi. 



The following general remarks on the Diatoms observed in the surface gatherings and in the deposit h-om the 

 Cliallengcr deep-water Station 157, extracted from the Challenger Report, Summary of Results, pp. 513-514, may 

 be of interest : — 



Considerable diti'erences are recognisable between the general appearance of Diatom preparations made from 

 surface gatherings as contrasted with those procured from the ooze forming the bottom in this locality. By far the 

 most abundant form at the surface was the peculiar, very elongated, ttexuous Thalassiothrix Imigissima, var. antardica, 

 Cleve and Gruuow [ = Synedru ih<d(tg.Hothrix, Cleve in parte], a species which has already been recorded as forming 

 large floating masses in the Arctic Ocean.i In the Antarctic its frustules were found arranged in little bundles— from 

 ten to twelve together— fastened together loosely at one end, but separate at the other, the whole being loosely twisted 

 into a spindle. In preparations isolated frustules of it occur but rarely, often two are found closely apposed, but not 

 uncommonly three, four, or even more are so placed. It is, perhaps, with Chwtoceros remotttm, Cleve and Grunow 

 [ = C. janischianum, Castracane], the most characteristic species found on the surface. 



The Clia!tocerotid;\> and Rhizosoleuia> are abundantly represented in tlie surface waters, but they are only repre- 

 sented by the terminal calyptrte of the latter in the bottom ooze. Most of the delicately curved, though often large, 

 forms, of Cordhron, and the singular cylindrical Dadytiosokn, have only been found in surface gatherings, whilst the 

 remarkable Tnichygphcni^i austndis, Petit, var. antardica (Sehwarz) [-= Frayilaria antarctica, C;istracane], which abounds 

 in the ooze, is much less common in the surface gatherings. Frustules of Coscinodisci and Actinocydi are also much 

 less numerous at the surface than upon the bottom, but no species which is present in tlie superficial waters is absent 

 from the ooze. 



The contents of the alimentjiry canals of several of the Echinoderms and AnneHds were examined witli the view 

 iif ascertaining whether or not a predilection was exhibited by the animals for any particular species of Diatoms ; it 

 was found, however, that they made use of the ooze as a whole, in all probability taking in the immediate surface 

 layer containing specimens recently fallen from the surface, which, doubtless, still contained some organic matter. 

 Th.e tubes of the Annelids, and the test of tlie Foraminifera licophax nodidosa, contained many of the large Coscinodisci 

 whicli would appear to have been to a gi-eater extent selected than the others in the deposit. 



» £thanj iU K. Sccnsl: Vdeiisk. Akad. IlamU., Bil. i., Xo. 13, Stockholm 1:«73. 



