i 7 o DISCOVERY REPORTS 



Genus Belaturricula n.g. 

 Type : Bela turrita St rebel 



This genus is provided for a large narrowly fusiform species with a tall spire, a bluntly rounded, 

 paucispiral smooth protoconch, a short straight spout-like anterior canal and a very shallow Turriculid 

 style of anal sinus, with the outer lip very little produced and parallel to the axis of the shell. The 

 dentition is not known, nor has it been determined if an operculum is present or not. 



The type species seems to be very similar to Watson's Pleurotoma (Surcula) dissimilis (1886, p. 298, 

 pi. 26, fig. 3) from south-east of the Philippine Islands in 500 fathoms. 



Strebel's shell has no resemblance to ' Bela ' auct., which name has long served as a dumping ground 

 for species of uncertain affinity. 



The sinus in the St. 159 example, recorded below, although shallow, is much more distinct than 

 shown in Strebel's figure. 



Belaturricula turrita (Strebel) 



Bela turricula Strebel, 1908, p. 18, pi. 3, fig. i,2a-c. 



Type locality. Shag Rock Bank, west of South Georgia, 53 34' S, 43 23' W, 160 m. 

 St. 159. Off Cumberland Bay, South Georgia, 53° 52' 30" S, 36 08' W, 21 Jan. 1927, 160 m. 



One empty shell, 50 x 17-5 mm., compared with 60 x 21 mm. for Strebel's holotype. 



Genus Conorbela n.g. 

 Type : Bela antarctica Strebel 



A new genus is required for this shell, which has little in common with the several other Antarctic 

 and Subantarctic species ascribed to 'Bela' auct. by Strebel (1908). 



The shell is comparatively large, thin and ovate-biconic with a prominent, flat, sloping shoulder 

 defined by a rounded peripheral keel. The protoconch, so far as can be judged from available material, 

 is relatively large, dome-shaped and paucispiral. The anterior canal is spout-like, very little produced 

 but slightly constricted by a spiral termination to the smooth, arcuate columella. The posterior sinus 

 is a broad, very shallow arc extending from the suture to the peripheral keel. The operculum is 

 irregularly ovate, with a terminal nucleus, vestigial, occupying only a third the linear dimensions of the 

 aperture. No radula was located. 



The form of the sinus suggests relationship with the Conorbiinae and the presence of an operculum 

 disassociates it from Gymnobela, the only other Turrid genus of similar form. Except for the lack of 

 columellar plaits and the shallow but definite posterior sinus, Conorbela resembles the Cancellarid 

 Admete carinata Watson and the Volutid, Paradmete percarinata n.sp. 



Conorbela antarctica (Strebel) 



Bela antarctica Strebel, 1908, p. 16, pi. 3, fig. 30a, b. 



Type locality. South-west of Snow Hill I., 64 36' S, 57 42' W, 125 m. 



St. 170. Off Cape Bowles, Clarence I., 6i° 25' 30" S, 53 46' W, 23 Feb. 1927, 342 m. (one old eroded shell). 

 St. 363. 2-5 miles S 8o° E of south-east point of Zavodovski I., South Sandwich Is., 26 Feb. 1930, 329-278 m. 

 (three living but somewhat eroded examples). 



