1888.] NATURAL SCIENCES OF PHILADELPHIA. 325 



Arms longest as 1. 3. 2. 4, althoiigli possibly the second pair 

 outmeasured the third pair previous to contraction ; slender, very 

 tapering, and exceedingly attenuated toward the apex ; suckers fairly 

 large, closely placed, and in regular zigzag alternation from the base, 

 contracting with a quadrangular outline. 



Body granulated posteriorly, and to a less extent in the region of 

 the neck. Color milky, closely blotched or speckled with ochre, 

 giving a yellowish appearance, and sprinkled with brown. 



Length of specimen about nine or ten inches. 



The only form with which I can closely compare this species is the 

 Octopus Bermudensis of Hoyle (Challenger Reports, Zoology, XVI, 

 p. 94, PI. II, fig. 5), which is described from a single young specimen, 

 measuring, including the arms, not more than two and a-half or three 

 inches. It differs from this form in the extremely tapering and 

 attenuated arms, their relative lengths (1. 3. 2. 4 instead 1. 2. 3. 4), 

 and in the disposition of the acetabula, which are in zigzag alterna- 

 tion 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. Bermudensis, 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 dis- 

 tinctly 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). 



GASTEROPODA. 



Aplysia aequorea, n. sp. (PI. 16, figs, 2, 2:i, 2b). 



Body broadly oval, w^ith a moderately elongated neck ; tentacles 

 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 annula- 

 tions and irregular markings, which are few and scattered ; the inside 

 of the mantle-lobes, as well as the cover to the opercular cavity, al- 

 most 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. 



