MARINE MOLLUSCA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 131 



Family Cancellariidge. 



Paradmete typica, Strebel. 



Paradmete typica, H. Strebel, Schwed. Sudpolar Exped., Band vi., 1, p. 22, Taf. iii. fig. 35 a-/ (1908). 



Hob. Burdwood Bank, Station 346, at 56 fathoms, December 1, 1903. 

 Thus showing a considerable extension in range. Only one specimen, but in 

 good condition. 



Admete limneasformis, Sm. 



1 Admele limneseformis, E. A. Smith, Phil. Trans. Roy. Soc. Land., clxviii. p. 172, pi. ix. 

 fig. 4 (1879). 



Hob. Trawl, Burdwood Bank, at 56 fathoms. Station 346. 



One example, in good condition, exactly agreeing with the type, from Kerguelen 

 Land. We should hardly be prepared to suggest placing this in Dr STREBEL'S new 

 genus Paradmete. Mr CHARLES HEDLEY has lately hinted at its possible reception 

 into the genus Odostomiopsis, Thiele, and this is well worthy of consideration. The 

 shell is small, white, semi-transparent, and, as the trivial name, so well chosen, 

 suggests, almost an exact reproduction of Limnsea peregra, Miill., in miniature. 



Order OPISTHOBRANCHIATA. 

 Sub-order TECTIBRANCHIATA. 



() Bulloidea. 



Family Twnatinidse. 



Retusa Antarctica, sp. n. (Plate, fig. 20). 



R. testa delicata, parva, ovato-fusiformi, rimata, pallidissime' livido-virescente, perlsevi, subpellucida, 

 anfractibus 4, quorum apicales duo tumescentes, cseteris ad suturas rotunde" gradatim impressis, ultimo 

 raagno, Isevi, apertura ovata, labro sinuato, vix crassiusculo, columella obliqua. 



Alt. 3'25, diam. T75 mm. 



Hob. Scotia Bay, South Orkneys, 9-10 fathoms. Station 325. 

 A small, plain, greenish-livid species, translucent, very smooth, with swollen nuclear 

 whorls, and roundly shouldered at the. sutures. 



Retusa truncatula (Brug.). 



This widely distributed species, the full synonymy of which we gave in our last 

 paper (loc. cit., p. 141), and which is hardly distinguishable from the British form, 

 also occurred at the Burdwood Bank locality, Station 346, 56 fathoms. 



Fragments of others of this order, belonging to the genera Cylichna and Phihne, were 



(ROY. 8OO. EDIN. TRANS., VOL. XLVIII., 357.) 



