MARINE MOLLUSCA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 123 



Lacuna ><l>i/.^/c<>/<t, sp. n. (Plate, figs. 8, X't, 8b). 



L. testa parva, profuiidc'- umliilk-ata, all>n-ra!raiva. rpidc'rmidc- lin.imic.-a contec-ta, fragili, vix solida, 

 imfractibua 5, quorum apex ipsc- miiv iniiiic rsus", duobus his pvuximis cum pi-miltimis tiniiidulis, ultimo 

 pauHum effuso, lievi, omniluis inlV.-i suturas c-aualiculatis et acute spiraliter cariuatis, apud basini, circa. 

 umliilicuni, crassi-earinato cariuis liinis, sulco interstitial! pnedito, apertura rotunda, labro tc>mii, margine 

 columellari late retlexo. 



Alt. -2, lat. 2-15 rum. 



Hal. Deposit No. 38, dredged .\Iareh 18, 1904. Lat. 71 22' S., long. Hi" 34' W., 

 1410 fathoms. Station 417. 



One specimen only, hut adult and fairly perfect, save for a slight fracture of the 

 outer lip. It appears nearly akin to L. ininlil ijnrmis, Jeffreys, or L. cincta of the same 

 author, from the Atlantic-, collected mi the /'rr/^////<< Expedition, especially as 

 regards the sculpture round the umbilical region, the thickened double carination with 

 interstitial sulcus. Another feature of interest is the curiously immersed nucleus, 

 and the strong canaliculation round the upper portion of i-ach whorl, followed by an 

 acute spiral keel. The substance of the shell is chalky white, covered with a dark- 

 brown epidermis. The specific name proposed is given in consideration of the extreme 

 depth at which it was dredged. 



Lacuna wandelensis, E. Laniy. 



Lacuna wand>l<itfi>-, E. Lamy, Es^'il. .1 utftn-f. Fnuiriu'.^ com niiiiidee par le Dr Jean Char cot : 

 Moll., p. 5, pi. i. iigs. 5, 6, 7 (Paris, 1906). 



Halt. Station 325, Scotia Bay. South Orkneys, 9-10 fathoms, on Macrocystis and 

 other large Fuci. 



A very few examples, and all in non-adult condition, belong almost certainly to 

 this species. 



Family Rissvi(l&. 



Ri sx< in <fi'?>rfti; Sm. 

 t,(, }]. \. Smith, Aa/. A/tturct. F.xfifd. : Nat. Hist., vol. ii. p. 9, pi. ii. fig. 1 



(1907). 



Halt. South Orkney Islands, Scotia Bay, 9-10 fathoms. Station 325. 

 The specimens are dead, but seem to agree in form with the above species. 



(Onoba] filostria, sp. n. (Plate, fig. 9). 



H. h-M.-i parva, paulluiii intiata. solidula, parum rimata, anfractiliu-i 4.',, cpini-uni apiralrs .Inn heves, 

 tiiiniduli. c-ii-teris vi-nti-icusis, apud suturas improsis, arctissimd spiraliter tenuiliratie, api-ituia uvata, alba, 

 la) ini paiillinii etfuso, hand iiiiiltuin im-ra-.-alci, fc-ix- c-uiitiuuo. 



Long. 2, lat. 1'50 mm. 



Hab. South Orkney Islands, Scotia Bay, 9-10 fathoms. Station 325. 



Allied to several Onul;<-. mostly described of recent years from deep-sea explora- 



(RoY. SOC. EHIN. TRANS, Vol.. XLVUI., 349.) 



