I3 , DISCOVERY REPORTS 



C. Prosiphiinae (central tooth tricuspid, lateral teeth multicuspid). Typically, the laterals have 

 a long basal projection, like a handle ; without this projection but with lateral denticles, in Proneptunea ; 

 and combining the features of basal projection and lateral denticles, but minus the central tooth in 

 Meteuthria, Prosipho, Anomacme, Fusinella, Meteuihria, Proneptunea and Chlanidotella. The Prosipho 

 radula, including its variations, does not appear to occur outside Antarctic and Subantarctic seas. 



The above arrangement is provisional only and is probably more convenient than real. It is advanced, 

 however, as a step towards the unravelling of the complexity of southern Buccinoid development. 



There is no reason why we should look for the origin of these shells from outside the Southern 

 Ocean, for they could have developed in that region concurrently with the northern Buccinidae and 

 Neptuniidae, a common ancestry being assumed in the geological past. It would seem that Searlesia 

 (the West American dira) and Kelletia are both invading Buccinulidae from the south and conversely 

 that the South African Burnupena is a true member of the northern Buccinidae. 



In this connexion the present distribution of Fnsitriton demonstrates the effectiveness of the 

 continuity of the Americas with the Scotia Arc, and the Atlantic-Indian Ocean cross-ridge in giving 

 that genus a bipolar circum-Pacific range. 



Family BUCCINULIDAE 



Subfamily Cominellinae 



Genus Pareuthria Strebel, 1905 



Type (s.d. Tomlin, 1932), Fusus plumbeus Philippi 



A characteristic Subantarctic and Antarctic genus of small, elongately fusiform shells resembling 



Euthria and Buccinulum in shell features, but with bicuspid instead of tricuspid lateral teeth, which 



feature allies the genus with the Cominellinae. The protoconch is smooth and papillate, of about two 



whorls, and the operculum is leaf-shaped with a terminal nucleus. 



The genus is best developed in the Magellan region, but extends eastwards to Campbell Island, New 

 Zealand, and southwards to the Davis Sea. 



Pareuthria fuscata (Bruguiere) 



Buccinum fuscatum Bruguiere, 1789, p. 282. 



Buccinum antarcticum Reeve, 1846, fig. 30. 



Euthria anta.rcti.ca Adams, 1858, p. 86. 



Tritonium schwartzianum Crosse, 1861, p. 174, pi. 6, figs. 9, 10. 



Fusus (Euthria) fuscatus Watson, 1886, p. 209. 



Euthria fuscata Strebel, 19056, p. 611, pi. 24, figs. 69-72, 74-79. 



Euthria antarctica Lamy, 1905, p. 476. 



Euthria fuscata Lamy, 1907, p. 2. 



Euthria fuscata Melvill & Standen, 1907, p. 139. 



Euthria (Pareuthria) fuscata Strebel, 1908, p. 28. 



Euthria (Pareuthria) fuscata Melvill & Standen, 1914, p. 121. 



Type localities. ? (fuscatum) ; Falkland Is. [antarcticum). 



St. 54. Port Stanley, East Falkland Is., 15 May 1926, Shore collecting. 



St. 55. Entrance to Port Stanley, East Falkland Is., 2 cables S 24 E of Navy Point, 16 May 1926, 10-16 m. 



St. 56. Sparrow Cove, Port William, East Falkland Is., ii cables N 50 E of Sparrow Point, 16 May 1926, 



ioi-16 m. 

 St. 58. Port Stanley, East Falkland Is., 19 May 1926, 1-2 m. 



Dentition. Fig. L, 69, p. 194. 



Range. Strait of Magellan and Falkland Is. 



