PROPILIDIUM. 73 



Patella.' ancyloides FORBES, Ann. Mag. X. H. v, p. 108, t. 2, f. 

 16.Propilidium ancyloide F. & H., Hist. Brit. Moll, ii, p. 443, t. 

 62, f. 3, 5 ; t. AA. f. 4. JEFFREYS, Brit. Conch, iii, p. 254. SARS, 

 Moll. Reg. Arct. Norv., p. 123, t. 20, f. 18a-e. DALL, Blake Report, 

 p. 412, t, 31, f. 2 (dentition). P. ancyloides JEFFR., P. Z. S. 1882, 

 p. 673. Rostrisepta parva SEG., teste JEFFR. 



The small internal transverse septum is a peculiar feature of this 

 species. 



P. SCABROSUM Jeffreys. PI. 40, figs. 47, 48. 



Shell roundish-oval, expanded, rather thin, seraitransparent and of 

 a dull hue ; sculpture, numerous but not close-set, slight stria? which 

 radiate from the beak and are more or less covered with short 

 tubercles, especially behind ; there are also several concentric ridges 

 as in the last-named species; color whitish ; beak small, pinched up, 

 incurved, and forming a minute spire of two whorls; mouth 

 roundish oval; margin thin; inside glossy; septum thick and 

 strong. Length O'lo, breadth 0*15 inch. (Jeffr.) 



Adventure Bank, Mediterranean. 



P. scabrosum JEFFR., P, Z. S. 1882, p. 674, t. 50, f. 6. 



Differs from P. ancyloides in being round instead of oval, and in 

 having much fewer and tuberculated striae ; but I am not quite 

 satisfied that it is more than a curious variety. It somewhat 

 resembles the young of Gadinia garnoti ; but that shell has not the 

 internal septum which is characteristic of the present genus. 



P. AQUITAXEXSE Locard. Un figured. 



Shell very small, patelliform, conic a little elevated ; thin, rather 

 solid, opaque, a little rugose, ornamented with longitudinal striae 

 which are very obsolete, visible only toward the base. Basal margin 

 continuous, smooth, irregularly level, visibly turned up at the two 

 extremities, descending at the median part ; aperture very broadly 

 elliptical, a little contracted behind, well rounded in front. Summit 

 subcentral, a little anterior, little elevated, recurved toward the an- 

 terior region. Length 2, width If, alt. If mill. (LocardJ) 



France. 



P. aquitanense LOCARD. Proc. de Malac. Francaise, Obs. sur la 

 Faune Marine des Cotes de Fr., in Annales de la Soc. Linn, de Lyon, 

 xxxii, 1885, p. 244 (1886.) 



This form has not been figured, and no locality is given by Locard 

 in his worthless publication. It is said to be near P. scabrosum 



