Mr. Alder and Mr. Hancock on new Mollusca. 35 



rather shorter than the dorsal ones, lineal, depressed. Branchiae 

 numerous, stout, elliptic-oblong, orange-coloured above with an in- 

 termediate circle of white, and of a warm purple -brown below ; set 

 in ten or eleven close transverse rows of five or six each on the sides 

 of the back. Foot transparent, the front angles blunted and not much 

 produced. Length T %ths of an inch. 



Under large stones near low- water mark at Whitley, rare. 



E. OLIVACEA. 



Body pale yellow, sprinkled with white and orange-red or brown, 

 Dorsal tentacula approximating, linear, obtuse, with a central red- 

 dish band. Oral tentacula shortish, linear and obtuse. A streak of 

 red runs on each side of the head between the oral and dorsal ten- 

 tacula, extending behind the latter a short way down the back. 

 Branchiae few, thickish, elliptic-oblong, set in six or seven rows, 

 three or four abreast, on each side of the back, of a pale olive-brown 

 colour, the interior of a granular appearance. Foot watery white, 

 broadish and rounded in front, extending to a fine point behind. 

 Length ^yths of an inch. 



Under stones at Whitley and Cullercoats, rather rare. 



It is the most soberly coloured of the genus. 



E. Hystrix. 



Body slender, white, with olive-brown spots on the back, and a 

 row of large blotches of the same along the sides. Dorsal tentacula 

 linear, approximating, white with an olive -brown band in the centre. 

 Oral tentacula rather shorter than the dorsal, banded in the same 

 manner. Branchiae elliptic -oblong, pointed, white, with three cir- 

 cular olive-brown bands set in'six or seven distant transverse rows 

 of four or five each on the sides of the back, diverging. Foot trans- 

 parent white, rounded in front and slightly produced at the sides. 

 Length y^ths of an inch. 



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



E. VITTATA. 



Body slender, pale buff speckled with fawn-colour. Head rather 

 large and truncated in front. Dorsal tentacula slightly conical, 

 wrinkled, fawn-coloured, with pale tips. Oral tentacula rather 

 shorter than the dorsal ones and of the same colour. Branchiae 

 somewhat clavate, long, with obtuse terminations, very pale fawn- 

 coloured, with three darker bands of the same colour ; set in six or 

 seven distant rows down the sides, largest in front, four to seven in 

 each row. Length f^jths of an inch. 



On a coralline from deep water, Cullercoats ; one specimen only 

 found. 



This species differs from the last in the shape of the head and 

 branchiae. 



E. PALLIDA. 



Body transparent white with a tinge of yellow, spotted with opake 

 white and bright rose-colour on the back and head. Dorsal tenta- 



D2 



