MARINE MOLLUSC A OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 127 



Mathilda rhigomaches, sp. n. (Plate, fig. 15). 



M. testa minuta, imperforata, fusiformi, delicata, pallid^ fusoescente, anfractibus 6|, quorum apicales 

 2J heterosfcrophi, albi, leeves, bulbosi, eaeteris apud suturas impressis, pulchre spiraliter carinatis, earinulis 

 tribus anfractuum superiorum, ultimo quatuor, arctissimd lirulis longitudinalibus decoratis, interstitiis 

 quadratis. apertura rotunda, labro tenui, margine columellari paullum excavato. 



Long. 2, lat. 1 mm. 



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



In sculpture this little species resembles a Lovenella, especially L. austrina, 

 Heclley,* from the opposite shores of Antarctica. It is only about a quarter of the 

 size, however, of this shell, while the apex is heterostrophe, the peristome continuous. 

 FISCHER (Man. de Conch., p. 172, 1887) gives a list of Magellanic Mollusca, and 

 includes a " Mathilda magellanica." This is evidently a " nomen nudum." No 

 description can be found, and the name rests on no authority. The remarks of 

 M. DE BOURY t will probably, in connection with this, be found of interest, (piyonaws, 

 contending with cold.) 



(c) Gymnoglossa. 



Family Eulimidse. 



Eulima antarctica, Strebel. 



Eulima antarctica, H. Strebel, Sehwed. Sudpolar Exped., Band vi., 1, p. 65, Taf. vi. fig. 91 a-c. 

 (1908). 



Hab. Trawl, Burdwood Bank, south of the Falkland Islands, 56 fathoms. 

 Station 346. 



One specimen, live, but hardly full-grown. 



Family Pyramidellidse. 

 Turbonilla smithii, Pfeffer. 



Turbonilla smithii, G. Pfeffer, MS. in H. Strebel, Mollusk. der Magalhaen. Prov., p. 659, Taf. 

 xxiii. fig. 42 a-d (1905). 



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



One example, immature, but with sufficient characters to pronounce fairly certainly. 



Turbonilla xenophyes, sp. n. (Plate, figs. 16, 16a). 



T. testa aciculato-fusiformi, delicata, subpellucida, albo-lactea vel pallide straminea, paullum nitente, 

 anfractibus 9, quorum apicales bulbosi, tumidi, leniter beterostrophi, caeteris veutricosulis, ad suturas impressis, 

 sub lente delicatissime longitudinaliter liratis, in speciminibus quibusdam fere" vel omnino Isevibus, apertura 

 ovata, peristomate tenui, columella simplice. 



Long. 2-75, lat. '75 mm. 



* Report Brit. Antarct. Exped., 1907-9 (Shackleton), vol. ii., part i. p. 5 (pi. i. fig. 7) (1911). 

 t Journ. de Conch., vol. xxxi. p. 118 (1883). 



(HOY. soc. EDIN. TRANS., VOL. XLVIIL, 353.) 



