MARINE MOLLUSCA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 11!) 



Scissurella euglypta, Pels. 



Scissurella eugliipt, P. Pelseneer, Voy. du 8.Y. " Belgira " : Zooloijie, p. 17, pi. iv. 

 figs. 43-45 (1903). 



Hob. Trawl, Burdwood Bank, at 5G fathoms. Station 346. 

 Only one imperfect specimen, but recognisable. 



Scissurella siipraplicata, Sm. 



Scissurella supraplicata, E. A. Smith, Ann. ami May. N.H., xvi. p. 72 (1875). 



,, ,, Phil. Trans. Roy. Soc. Lunilun, vol. clxviii. p. 17(J, 



pi. ix. figs. 5, 5o(1879). 



Hal). Trawl, Burdwood Bank, at 56 fathoms. Station 346. 



Several examples, mostly imperfect, of this pretty species, striking on account of 

 its very marked plication above the double keel. 



fi/nora, sp. n. (Plate, figs. 2, 2a). 



Sc. testa niinuta, tenui.ssim.-i, alba, cpidermide straminua omnino contecta, depresso-effusa, anfractibus 4, 

 apicalibus parvis, ultimo lato, supra ad peripheriam planato, radiatim lineis obliquis tenuibus prsedito, 

 scissura angusta, profunda, infra :id basim concentric^ trilirato, apcrtiira ovata, iiitus alba, labro pertenui, 

 cohimella paullum incrassata, for6 recta. 



Alt. 1, diam. 1'75 mm. 



Ha b. Station 325, Scotia Bay, South Orkneys, 9-10 fathoms, on Macrocystis 

 pyrifera and other large Fuo.i. 



A depressed, obliquely effuse little species, of which but few examples occurred, all 

 in live condition, covered with straw-coloured epidermis. The upper part of the body 

 whorl is not so conspicuously radiate as in many species ; the slit is narrow, deep, its 

 edges being carinate. (n/otiopoy, honoured.) 



Section Azygobranchiata. 



Family Cyclostrematidiv. 



Cydostrema calypso, sp. n. (Plate, fig, 3). 



C. testa perminuta, anguste sed profundc' umbilicata, conica, alba, delicatula, anfractibus ad 5, iuclusis 

 apicalibus duobus laevibus, cseteris arete" longitudinaliter liratis, et spiraliter decussatim striatulis, numero 

 lirarum ultimi anfractus ad quadraginta, anfractibus omnibus ventricosis, ad suturas inultuin impresses, 

 apertura rotunda, peristomate contiiiuo. 



Alt. 1, diam. 1'15 mm. 



Hab. Trawl, Burdwood Bank, lat. 54 25' S., long. 57 32' W., at 56 fathoms. 

 Station 346. 



Exceedingly minute, resembling C. decussatum, Pelseneer,* in many ways, but 

 differing in () size, and (b) in fine and close longitudinal liration. To C. conicum, 

 Watson, collected during the Challenger Expedition (Station 24), it likewise is akin ; 

 but in this species, more than double the dimensions to begin with, the lamellae are 

 much stronger proportionately, and fewer in number than in either C. decussatum 

 or C. calypso. 



* P. PELSENEER, Voy. du N.F. "Eelyiw," p. ID, pi. v. tig. 48 (1903). 

 (ROY. soc. EDIN. TRANS., VOL. xivm., 345.) 



