ZOOLOGY. MOLLUSCA. 185 



disposition of the acetabula, which are in zigzig alternation 

 from first almost to last ; the body is also in part granulated, 

 and the siphon, instead of being attached for nearly its full 

 length, is largely free. 



I should have hesitated, perhaps, in describing this as a new 

 species, distinct from 0. Bermuderws, and preferred supposing 

 that the characters indicated by Hoyle were not very clearly 

 marked, or that they possibly represented only the immature 

 form, but Hoyle distinctly states that while his specimen is 

 probably immature, the characters are so well marked as to 

 safely permit of their recognition as typical of a new species 

 (op. cit., p. 95). 



Aplysia aequorea. (PI. 15, figs. 2, 2a, 2b). 



Body broadly oval, with a moderately elongated neck; ten- 

 tacles cylindrical, slit at the extremity ; buccal lobes broad, 

 infolded; mouth between fairly developed lips; aperture to 

 opercular cavity on a slightly raised papilla. 



Color drab or greenish ; exterior surface with thin black an- 

 nulations and irregular markings, which are few and scattered ; 

 the inside of the mantle-lobes, as well as the cover to the oper- 

 cular cavity, almost free of blotches. 



Shell narrowly-elongate, somewhat oblique, and calcareously 

 lined ; longitudinally radiated, and transversely finely striated. 



Length of animal about four and a-half inches. 



A single specimen, found in shallow water on the south side 

 of Castle Harbor, opposite Tucker's Town. 



The nearest ally of this species is probably the Aplysia 

 occllata of D'Orbigny, from the Canary Islands, or the common 

 A. dactylomcla, from the eastern Atlantic, of which the former 

 is by some authors considered to be only a local variety (Roche- 

 brune, Nouvelles Archives du Mustum, 1881, p. 264). From 

 both of these forms, apart from other characters, it differs in 

 the absence of the heavy ocellation, and from A. dactylomela 

 in lacking the purple lining on the mantle margins. From 

 A. oce&zta, again, it is clearly marked off by the non-maculated 



