72 PROPILIDIUM. 



Patella? emarnuiulokhs PHIL., Mai. Bl. xv, p. 224, 1868. 



A single specimen seen. Has the aspect of Emarginula, but no 

 trace of any incision in the shell. The riblets in front are smaller, 

 filiform ; wider and more distant behind. The animal soaked in 

 water showed elongated tentacles with eyes at their bases, but 

 branchiae could not be made out. (Phil.) 



This may be referred to Lepeta provisionally. 



Genus PROPILIDIUM Forbes & Hanley, 1849. 



Propilidium F. & H., Hist. Brit. Moll, ii, p. 443, 444. BARS, 

 Moll. Reg. Arct. Norv., p. 123. FISCHER, Manuel, p. 863. BALL, 

 Blake Report, p. 412. Eostrisepta SEGUENZA. 



The adult shell of this genus retains the distinctly spiral nucleus ; 

 and in the cavity of the apex it is furnished with a small plate or 

 septum, like that of Puncturella. 



The dentition (pi. 39, figs. 13, 14) is very similar to that of 

 Pilidium. It may well be doubted whether there are any gills, 

 although Forbes' original figure shows a pair of small plumes. This 

 point calls for additional observation. At all events, the position of 

 the genus is doubtless in Lepetidce, for the dentition agrees with no 

 other family of limpets. 



P. ANCYLOIDE Forbes. PL 39, figs. 8, 9, 10, 11, 12, 13, 14, 15. 



Shell having an oval outline, compressed at the sides, rather thin, 

 semitransparent, glossy at the apex, but elsewhere of a dull hue ; 

 sculpture, very numerous and close-set fine striae, which radiate from 

 the beak and are exquisitely granulated in consequence of their being 

 intersected or decussated by equal sized concentric striae ; color 

 dirty white, occasionally diversified by a few clear longitudinal 

 rays or lines; beak smooth and highly polished, styliform and 

 slender, pinched up into a minute spire of between one and two 

 whorls, which curls downwards at the posterior end ; mouth oval ; 

 of nearly the same breadth throughout; margin thin and even, 

 minutely tuberculated in immature specimens ; inside nacreous, 

 furnished in the centre with a thin laminar partition, like the half 

 deck of a vessel, which has its opening towards the head or anterior 

 part; pallial scar broad. 



Length 0'15, breadth O115 inch. (Je/r.') 



Coasts of Ireland and Scotland ; Scandanavia ; Naples, and Tra- 

 pani, Sicily, 10-145 fms. Fossil in Sicilian, Pliocene. 



