34 Mr. Aldei' and Mr. Hancock on new Mollusca. 



divided into smaller ones. Foot transparent white, tinged with rose- 

 colour. Length nearly half an inch. 



Among the rocks at low-water mark, Cullercoats ; A'ery rare. 



Much more delicate, transparent and graceful in its proportions 

 than the preceding, to which it is nearly allied. 



Melibcea ornata. 



Body slender, pale yellow or buff, with pink streaks and spots. 

 Tentacula filiform, issuing from wide sheaths much produced ante- 

 riorly. Veil truncated in front, extending into points at the sides. 

 Branchiae, six pairs, large, elliptical, pedunculate, papillose, the pa- 

 pillae much produced and each terminated by a dark red spot, set in 

 three circles of four to seven each, and a terminal one at the apex. 

 Foot slender, transparent white, tinged with yellow. Length -j^ths 

 of an inch. 



On corallines from deep water, Cullercoats. 



Very much resembling M. coronata, Johns., from which it differs 

 in the form of the veil and in the more produced papillae. It is al- 

 together a more slender animal. 



EOLIS ROSEA. 



Body rather broad, pointed behind, watery white, tinged with 

 rose-colour and buff on the back. Dorsal tentacula short, linear, 

 obtuse, tinged with rose-colour. Oral tentacula short, white. Two 

 pale lines proceeding from the latter terminate in a point near the 

 dorsal tentacula, as in E. papillosa. Branchiae numerous, short, ovate 

 and pointed, of a bright rose-colour, pale towards the edges, and 

 thickly sprinkled with opake white ; arranged in fifteen or sixteen 

 close-set transverse series, five or six in each, on the sides of the 

 back. Foot watery white, broad and truncated in front, obtusely 

 pointed at the sides. Length upwards of ^ths of an inch. 



At Cullercoats, rare. 



This comes very near to E. papillosa, but differs in size, colour, 

 and the number of branchial papilla;. 



E. OBTUSALIS. 



Body rather short and thick, of a uniform ochry yellow with red- 

 dish brown blotches on the head and back. Dorsal tentacula short, 

 cylindrical, reddish brown. Oral tentacula short and wide apart, 

 yellowish. Branchiae numerous, very short and obtuse, ovate, yel- 

 low, thickly set in about twelve rows on the sides of the back. 

 Foot transparent, rather broad, capable of being extended into a very 

 slender tail behind. Length j^^tlis of an inch. 



One specimen only has occurred, from deep water at Cullercoats. 



This species is also very nearly allied to E. papillosa, from which it 

 differs in size and colour, and is much more obtuse in all its parts. 



E. AURANTIA. 



Body rather stout, butt-coloured, transparent. Dorsal tentacula 

 orange, approximating, conical, annularly wrinkled. Oral tentacula 



