MARINE MOLLUSC A OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 101 



several Georgia Island species described by Dr PFKFFER.* It is of remarkably thin 

 substance, covered with a leathery brownish-olive epidermis, which extends over the 

 outer lip, and to some extent also round the columellar margin, which is slightly 

 basally produced. 



Littorina (Pellilitorina) pellita, v. Marts. 



Litlorina pellita, E. von Martens, "Moll. Siid-Georgien," Sitz. Ges. Naturf. Fr. Berlin Jahrg., 



1885, p. 92. 

 Lserilitorina pellita (Marts.), v. Martens and Pfeffer, "Moll. Siid-Georgien," Jahrb. Hamburg. 



Wiss. Anst., iii. Jahrg., p. 79, pi. i., figs, b, d (1886). 

 Littorina (Pellilitorina) pellita (Marts.), E. A. Smith, "Southern Cross" Antarct. Exped., 



p. 204 (1902). 



Hob. Shore pools, Scotia Bay, South Orkneys, December 6, 1903. Station 325. 

 Off weed and stones at 9-10 fathoms, May 1903. 



The largest example (alt. 15, lat. 12 mm.) comes from Scotia Bay. 



Littorina (Pellilitorina} setosa (Smith). 



Littorina setosa, E. A. Smith, Ann. and Mag. N. Hist., xvi., p. 69 (1875); Phil. Trans. Roy. 

 Soc. Land., vol. clxviii., p. 172, pi. ix., fig. 6. 



Hob. Station 325, Scotia Bay, South Orkneys, 9-10 fathoms, June 1903. 



Much more uncommon than L. pellita, v. Marts. Our few examples are hardly 

 typical, and in form show affinity with pellita. We are indebted to Mr E. A. SMITH for 

 having examined them. 



Lacuna divaricata, Fabr. 



Trochus divaricatus, Fabr., Faun. Greenland., p. 392 (1780). 



Lacuna vincia, Forbes and Hanley, iii., p. 62, pi. Ixxii., figs. 10-12; Ixxiv., figs. 7, 8; 

 Ixxxvi., figs. 6-8. 



Hob. Shore, Port William, Falkland Islands, January 31, 1904. 

 We cannot dissociate the Antarctic specimens from those of Arctic or British 

 shores. One example is banded, being probably the var. fasciata, Brown. 



Lacuna notorcadensis, sp. n. (Plate, figs. 3, 3a). 



L. .testa parum rimata, ovato-rotunda, tenui, cinereo-alba, imdique epidermide tenui straminea 

 induta, anfractibus 4-5, quorum apicalis minutus, obtusus, Isevis, cseteris apud suturas gradatis, spiraliter 

 acute penultimo quadri-, ultimo anfractu octo-carinato, lineis incrementalibus obscuris longitudinaliter prseditis, 

 apertura fere rotunda, labro paullum elfuso, continue, columella fere recta. 

 Long. 3, lat. 3 mm. 



Hab. Station 325, Scotia Bay, South Orkneys, 9-10 fathoms, April 1903. 

 Much resembling in general appearance, though not in substance and texture, a 

 Fossarus, this little shell might possibly find a place near Lfevilitorina umbilicata, 



* VON MARTENS and G. PFEFFER, Mollusk. von Siid-Georgien, pp. 81 sqq. 

 (ROY. soc. EDIN. TRANS., VOL. XLVI., 131.) 



