SYSTEMATIC 165 



Genus Paradmete Strebel, 1908 



Type (here designated) : Paradmete typica Strebel 



This Antarctic genus was ascribed by its author to the Cancellariidae, but Thiele (1929, p. 351) 



figured the radula which is very similar to that of the Boreal Volutomitra, an atypical member of the 



Volutidae. Both Paradmete and Volutomitra have a spur-shaped central tooth and a pair of irregularly 



shaped lateral plates, without cusps. 



There are sufficient differences in detail, however, between the radulae of each to warrant retaining 

 both genera at present, but that they have had a common ancestry is almost certain. 

 Thiele (1929, loc. cit.) evaluated these shells as follows: 



Subfamily Volutomitrinae (of the Volutidae). 

 Genus Volutomitra H. & A. Adams, 1853. 

 Section Volutomitra (S.S.) 



Section Microvoluta Angas, 1877 ( = Paradmete Strebel, 1908). 

 Peile (1922, p. 18, text-fig. 8) figured and described the radula of the New South Wales australis 

 Angas, the genotype of Microvoluta. This species has a central tooth more like that of Paradmete than 

 that of Volutomitra, but differs from both in the absence of laterals. There is no marked similarity 

 between the relatively large and thin Paradmete, which has narrow, not very conspicuous columellar 

 plaits and the quite small, solid Microvoluta, with strong, very oblique plaits and a disproportionately 

 large, smooth, paucispiral protoconch. They should be kept separate until more is known concerning 

 their anatomy. 



Unfortunately, the several living examples from the ' Discovery ' material had been plunged into strong 

 alcohol and were too hardened and contracted to be worth dissecting. 



Paradmete fragillima (Watson) 



Volutomitra fragillima Watson, 1882, p. 334. 

 Volutomitra fragillima Watson, 1886, p. 263, pi. 14, fig. 7. 

 Paradmete typica Strebel, 1908, p. 22, pi. 3, fig. 35 a-/. 

 Paradmete typica Melvill & Standen, 1912, p. 357. 

 Volutomitra fragillima Smith, 1915, p. 74. 



Type localities. Royal Sound, 28 fathoms, Kerguelen I. (fragillima); South Georgia, 75 m. (typica). 

 St. 27. West Cumberland Bay, South Georgia, 3-3 m. S 44 E of Jason Lt., 15 Mar. 1926, no m. 

 St. 140. Stromness Harbour to Larsen Point, South Georgia, 54 02' S, 36 38' W to 54 11' 30" S, 36° 29' W, 



23 Dec. 1926, 122-136 m. 

 St. 156. North of South Georgia, 53 51' S, 36 21' 30" W, 20 Jan. 1927, 200-236 m. 

 St. 159. North of South Georgia, 53 52' 30" S, 36 08' W, 21 Jan. 1927, 160 m. 

 St. 190. Bismarck Strait, Palmer Archipelago, 64 56' S, 65 35' W, 24 Mar. 1927, 315 m. 



Range. Kerguelen I., 28 fathoms (Watson) ; off Oates Land, 69 43' S, 163 24' E, 180-200 fathoms 

 (Smith) ; South Georgia, 24-3 1 o m. (Strebel and ' Discovery ') ; Palmer Archipelago, 3 1 5 m. (' Discovery ') 

 and Burdwood Bank, 56 fathoms (Melvill & Standen). 



I have seen only South Georgian and Palmer Archipelago material, but Smith (191 5) remarked that 

 ' The Kerguelen shell figured by Watson has a much shorter spire than other specimens from the same 

 locality which agree perfectly with Strebel's figure of Paradmete typica'. 



Paradmete longicauda Strebel 



Paradmete longicauda Strebel, 1908, p. 24. 

 Type locality. South Georgia, 54 22' S, 36 27' W, 95 m. 



St. 27. West Cumberland Bay, South Georgia, 3-3 miles S 44° E of Jason Lt., 15 Mar. 1926, nom. 



