MARINE MOLLUSCA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 141 



Hab.— Trawl, lat. 62° 10' S., long. 41° 20' W., 1775 fathoms, March 10, 1903. 



A shell of papyraceous texture, as are so many abyssal species, whitish, with very 

 thin ash-coloured epidermis. The apex of our only specimen is wanting, and the next two 

 whorls much eroded ; the remainder are embellished with a central very acute and 

 bold keel ; in the last whorl this carina is situate above the centre, and not far below the 

 suture. A little lower comes a less-developed spiral keel. The triangular mouth is 

 ashy-white within, the columellar margin straight, and the canal prolonged. 



Mangilia costata (Donovan). 



Murex costatus, Donovan, Brit. Shells, vol. iii., pi. xci. 

 Pleurotoma costata, Don. ; Jeffreys, Brit. Conch., vol. iv., p. 379. 

 Mangelia costata, Forbes and Hanley, iii., p. 485, pi. exiv., A, figs. 3-5. 



Hab. — Shore, Port William, Falkland Islands, January 31, 1904. 



One somewhat shattered example, but agreeing with authentic Mediterranean and 

 British examples of the northern Mangilia costata (Don.), which is reported from South 

 Africa. 



Family Cancellariidsp,. 



Admete magellanica, Strebel. 

 Admete magellanica, H. Strebel, Zool. Jahrb., p. 594, Taf. xxii., figs. 29, 29 a-d (1905). 



Hab. — Port Stanley, Falkland Islands, shore, January 31, 1904. 

 Allied to A. delicatula, Smith,* but with finer ribs. 



Order Opisthobranchiata. 



Sub-order tectibranchiata. 



Family Tornatinidse. 



Retusa truncatula (Bruguiere). 



Bulla truncatula, Brag., Encycl. Meth., p. 377 (1792). 



Utriculus truncatulus, Jeff., Brit. Conch., iv., p. 421, pi. xciv., fig. 2. Sars. Moll. Reg. Arch. 



Norv., p. 285, pi. xxvi., fig. 2; pi. xvii., fig. 18. 

 Retusa truncate, Buq., Dantz., and Dollf., Moll. Rouss., i., p. 527, pi. lxiv., figs. 12-14. 

 Bulla truncata, Ad. (non Gmelin), Tr. Linn. Soc, v., p. 1, pi. i., figs. 1, 2. 

 Volvaria truncata, Brown, 111. Conch., G. B. ed., 1, pi. xix., figs. 17. 18. 

 Cylichna truncata, Loven, Ind. Moll. Skand., p. 42. Forbes and Hanley, Hist. Brit. Moll., 



iii., p. 510, pi. cxiv., figs. 7, 8; pi. vv. fig. 4 (animal). Meyer and Mobius, Fauna der 



Kieler Bucht, i., p. 87 (animal). 

 Bulla retusa, Maton and Rack., "Descr. Cat.," in Trans. Linn. Soc, viii., p. 128 (1804). 

 Retusa obtusa, Brown, Pop. Encycl., ii., p. 78, pi. xvii., fig. 110. 

 Volvaria pellucida, Brown, III. Conch., G. B. edit., i., p. 4, pi. xix., figs. 45, 46. 

 Utriculus truncatulus, var. pyriformis, Monts., Nom. Gen. e Spec, p. 50. 



* Nat. Antard. Exped., Nat. Hist., vol. ii. (Brit. Mus. N.H.), 1907, p. 4, pi. i., figs. 5, 5a. 



