262 nSSURELLIDvE. 



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 diflference. 

 " 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^ w^hile (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 



