some new and peculiar Mollusca. 233 



Fissurisejpia of Seguenza {Knw. d, Accad. d. Aspir. Nat. 3* 

 ser. vol. ii.) ; but the onlj character which distinguishes 

 Fissurisepta from Pancturella is the shape of the internal plate 

 or septum. The spire in Fissurisepta is usually deciduous or 

 worn away. The present species is allied to another unde- 

 scvibed species {granulosa), which I dredged in the ' Porcu- 

 pine ' Expedition of 1870 at a depth of 292 fathoms, and at 

 Drobak in Christianiafiord at 60 fathoms. In that species the 

 longitudinal stride are closely beaded, and there are no con- 

 centric or transverse strias. F. pajjiUosa and P. rostrata of 

 Seguenza are two other ' Porcupine ' species, and were found 

 by Professor Seguenza in the Pliocene formation at Messina. 

 The sculpture in all the species varies in being more or less 

 coarse or tine, and is sometimes absent. 



Scissurellidas. 



Scissurella crispata, Fleming. 



Sdssurella crispata, Flem. in Mem. Wein. Soc. vol. vi. p. 385, pi. 6. 

 f. 3. 



Station 5, 57 fms. ; one living specimen. British and 

 Scandinavian coasts, 7-300 fras. Greenland (Moller, Torell). 

 Spitzbergen (Torell). Labrador (Principal Dawson, fide 

 Packard) . Gulf of Gascony, 40-80 fms. (De Folin) . ' Light- 

 ning ' Expedition, 170 and 189 fms. ' Porcupine ' Expedition, 

 1869, west of Ireland, 164 and 173 fms.; one specimen is 

 intermediate in size between the Scotch and Scandinavian 

 forms : 1870, Bay of Biscay, 220-1095 fms. ; Mediterranean, 

 51-207 fms. Fossil in the Pliocene formation from Norway 

 to the ^gean archipelago. 



S. angulata of Loven is evidently the same as our species, 

 and differs in its much greater size only. I dredged it at 

 Drobak in 1869, and subjoin a description of the animal. 



Body milk-white, with a yellowish-brown tinge in front : 

 head thick, snout-shaped : tentacles conical, ciliated : eyes 

 small, on the outer base of the tentacles : foot bilobed and 

 double-edged in front, abruptly pointed behind ; tail or extre- 

 mity pinched up, and grooved underneath : p)edal filaments or 

 appendages as in Trochus, but more numerous (8 at least on 

 each side) ; they are angular and finely ciliated ; each fila- 

 ment has at its base a white globular eye-spot. The slit 

 serves for an anal or excretoiy duct ; faeces worm-shaped, 

 long, and of a dark brown colour, visible through the shell. 

 Operculum chitinous, thin, and multispiral, with a central 

 nucleus. The animal was shy or delicate, and died soon after 

 being put into a glass phial of sea-water. 



Ann. & Mag. N. Hist. Ser. 4. FoZ. xix. 16 



