32 DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE [JaU. 20, 



'Porcupine' Exp. 1870: Atl. St. C. Sagres. A single but 

 living specimen. 



This pretty species resembles in the coloured bands the well-known 

 N. triseriata of Say; but the whorls are not so ventricose in the 

 present species, the spire is more pointed, and the umbilicus differs 

 in having a small semicircular pad covering more than half of it. 

 The suture in the present species is not excavated as in N. rnontacuti, 

 and the spire is shorter and also more pointed. It differs from 

 N. macilenta and its probable variety N. rizzce, in shape, consist- 

 ence, colour, and umbilicus. 



Professor G. O. Sars" has very kindly examined for me the 

 odontophoresof the present species and N. triseriata. He finds that 

 the conchological difference of the two species is also well marked in 

 the structure of their respective raduhie. "The middle plate is 

 especially different. In N. notabilis the middle tooth is unusually 

 small, and by no means equals ihe size of the lateral teeth. lu 

 A^. triseriata the middle plate is rather large and has the middle 

 tooth much larger and more prominent than the lateral teeth. The 

 shape of the plate in each is also different. Moreover the jaws 

 in A'^ notabilis appear to be much coarser in structure, and the 

 whole radula is also comparatively longer. In both species the 

 inner uncinus exhibits the secondary tooth characteristic of the genus 

 (or subgenus) Lunatiu.'" 



8. Natica subplicata\ Jeffreys. (Plate IV. figs. 2, 2 a.) 



Shell globular or inclined to oval, rather thick, opaque, and 

 glossy : sculpture, numerous but short and irregular, ohlique, longi- 

 tudinal puckers or wrinkles below the suture of the body-whorl, 

 and the rest of the shell is sliglitly striated in the same direction : 

 colour ivory-white : spire short, apex pointed : whorls 5, tumid ; 

 the last occupies g of the spire in length : suture deepish : mouth 

 triangularly oval, pointed above and rounded below, equal in length 

 to :j of the spire : outer lip genily curved and thick-edged: inner 

 lip forming a narrow and nearly even glaze over the whole of the 

 pillar : umbilicus small, ending below in a broadish groove : operculum 

 horny, yellowish. L. 0'4, B. 0'35. 



•Porcupine' Exp. 18/0 : St. 1, 2, 3, 9, 13, 17a, C. Espichel, 22, 

 26, 30. 



Distribution. Bay of Biscay ('Travailleur ' Exp.), off C. Verd I. 

 (•Tahsman' Exp.); 370-1192 fms. 



Differs from other species now described or noticed in respect of 

 the peculiar folds below the suture. 



9. Natica angulata", Jeffreys. (Plate IV. fig. 3.) 



Shell solid, with a flattened spire and a sharp angular keel on 

 the j)eriphery ; whorls 2-3 ; suture deep ; umbilicus small. L. O'Oo, 

 B. 0075. 



'Porcupine 'Exp. 1869: St. 4. 1870: Atl. 30; Med. 55. 



All the specimens are very small ; but I cannot identify them 



' Plicated underneath the suture. - Angular. 



