PHILINE. 457 



(Dawson). It is as yet rare. My Skye specimen has 

 the remains of the mantle still adhering to the spire on 

 the outside, showing that the shell is internal. Being 

 minute, I have carefully compared all the specimens 

 (half a dozen) with the fry of other species of Philine, 

 as well as with those of Utriculm and Accra. I cannot 

 identify this with any of them. In the last two genera 

 the fry has the same cylindrical shape as the adult, and 

 the first whorl or nucleus of the spire is nipple-shaped. 

 Phyline sinuata of Stimpson (from 6 f., sand, in Bos- 

 ton Harbour) appears to be allied to the present species ; 

 but the spire of the North- American shell is represented 

 as rounded instead of carinated or angular. 



D. Smooth ; spire indistinct. 

 ty*.5^> 8. P. APERTA*, (Linne.) 



Bulla aperta, Linn. S. N. p. 1 183. P. aperta, F. & H. iii. p. 539, pi. cxiv. E. 

 f. 1, and (animal) pi. UU. f. 1, as Bullaa aperta. 



BODY broadly oval, rather convex above and flat underneath, 

 slimy, and of a consistency between gelatinous and fleshy, pale 

 yellowish -white or sometimes nearly clear white, with nume- 

 rous minute snowy specks : mantle shield-like, with a mem- 

 branous margin in front, and forming behind an angular lobe 

 which covers the crown of the shell: head or anterior disk 

 somewhat elongated, gently curved or squarish in front (now 

 and then slightly notched in the middle of this part), and 

 truncated behind : tentacles, or eyes, none : foot flexible, usually 

 rounded in front, with a membranous margin; side-lobes 

 thickened and folded back; these lobes, with the head-disk 

 and pallial shield, give a quadripartite appearance to the animal: 

 gizzard composed of three calcareous plates, united by a strong 

 cartilage ; they are concave on the outside, and covered over 

 with a thin tightly stretched membrane ; two of the plates, 

 which flank the sides, have the shape of an inequilateral tri- 

 angle, and are equal-sized ; the third is smaller and lozenge- 



* Open. 



VOL. IV. X 



