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 Utynculus and Acer a. 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 i., 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. 

 8. P. APERTA^, Linne, 



Bulla aperta, Linn. S. N. p. 1183. P. a^yerfa, F. & H. iii. p. 539, pi. csiv. e. 

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



Body broadly oval, rather convex above and flat imdenieath, 

 shmy, 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 lobe«, with the head-disk 

 and pallial shield, give a quadripartite ai)pearance 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 



