MARINE MOLLUSCA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 127 



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



M. testa iniimta, iinperforata, fusifonui, delicata, pallide fuscescente, anfractibus 6^, quorum apicales 

 2J heterostrophi, albi, Ireves, bulbosi, cfeteris apud suturas impressis, pulchre spiraliter cariiiatis, carinulis 

 fcribus anfractuuni superiorum, ultimo quatuor, arctissimd lirulis longitudinalibus decoratis, interstitiis 

 quadratis, apertura rotunda, labro teiiui, margine columellari paullum excavate. 



Long. 2, hit. 1 mill. 



Hah. — Trawl, Biu-dwood Bank, at 56 fathoms. Station 346. 



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

 Hedley,* 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 {Mari. 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, (pyo/iax'??, 

 contending with cold.) 



(c) Gymnoglossa. 



Family Eulimid^. 



Eulima antarctica, Strebel. 



EuUma antarctica, H. Strebel, Schwed. Sudpolar Exped., Band vi., 1, p. 65, Taf. vi. fig. 91 a-r 

 (1908). 



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

 Station 346. 



One specimen, live, but hardly full-grown. 



Family Pyramidellidfe. 

 Turhonilla .smithii, Pfeffer. 



Turl)oniUa smithii, G. Pfeffer, MS. in H. Strebel, Molliish 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, 16«). 



T. testa aciculato-fasiforrai, delicata, subpellucida, albo-lactea vel pallidc straminea, paullum nitente, 

 anfractibus 9, quorum apicales bulbosi, tumidi, leniter beterostropbi, cfeteris ventricosulis, ad suturas impressis, 

 sub lente delicatissime longitudinaliter lirati.s, in speciminibus (juibusdam fere vel omnino la;vibus, 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. x,\xi. p. 118 (1883). 



(ROY. SOC. EDIN. TRANS., VOL. XLVIII., 353.) 



