262 FISSURELLIDiE. 



at the sides ; the front is more arched or convex, and the back 

 more concave ; the longitudinal ribs are more closely set, and 

 mostly equal- sized; the cancellation is smaller, and exhibits 

 round holes instead of square lattice-work ; the colour is 

 often pinkish ; the beak quite overhangs the front margin in 

 full-grown specimens, and it is invariably longer, and greatly 

 incurved ; the slit is much shorter ; the mouth is smaller ; 

 and the inside is frequently reddish-brown, and the cancelli 

 are marked by white spots. L. 0*225. B. 0-185. 



Habitat : Common in 7-25 f. on the coast of Dorset 

 (Bell and others); Exmouth (Clark); Plymouth (J.G.J.); 

 Cornwall (Peach and others) ; Scilly Isles (Lord Vernon) ; 

 Channel Isles (Hanley and others) . Coralline Crag at 

 Sutton (coll. S. Wood); Palermo (Philippi). Its extra- 

 British distribution in a recent state is entirely southern, 

 but extensive; it embraces the coasts of France, Italy, 

 Algeria, and the Hellespont, at depths varying from 

 8 to 95 f. 



I have taken this living with E. fissura ; other- 

 wise I should have been disposed to consider it an 

 aberrant form of that species. Mr. Alder lately com- 

 pared the tongue of E. rosea with a drawing which he 

 had previously made of the same organ in E. fissura ; 

 and he notices the following small points of difference. 

 u The uncini or lateral spines are of three kinds. The 

 large inner one appears to be longer and more produced 

 at the point than in E. reticulata [E. fissura] ; and the 

 spines of the second kind, which are denticulated at the 

 points, are four in number in E. rosea, while (if my 

 drawing is correct) there are only three in E. reticulata 

 [E. fissura] . Their tips appear to be more slender." 

 The present species must be very prolific, judging from 

 the extraordinary number of the ova produced in April ; 

 each is enclosed in a cartilaginous case. Specimens of 

 a larger size than usual are only 3| lines long. Their 



