322 PROCEEDINGS OF THE ACADEMY OF [1888. 



to look upon tliem as mere varietal forms of a single species, the Al- 

 pheus avarus of Fabricius. The older the specimens, the more 

 deeply grooved is in most cases the hand. 



Alpheus minus, Bay. 



A number of species taken from sponges and tunicates collected 

 in Harrington Sound. All the individuals were of small size, meas- 

 uring rather less than an inch in length, although the females were 

 abundantly provided with eggs. 



Alpheus formosus, Gibbes. 



One specimen (dredged) which agrees well with Gibbes' descrip- 

 tion (Proc. Amer. Assoc, 1850, p. 196), and seems to indicate that 

 the species is distinct from Alpheus minus, witlr which it is united 

 by Kingsley. The specimen is larger than any of the individuals of 

 A. minus, and is also differently colored, although appearing identi- 

 cal in alcohol. 



Palsemonella tenuipes, Dana. 



Several specimens dredged off Shelly Bay, which agree perfectly 

 with the species described by Dana from the Sooloo Sea (U. S. Ex- 

 ploring Expedition, Crustacea, p. 582). The remarkable distribu- 

 tion here indicated induced me to make a very careful examination 

 of the Bermudian species, which has left no doubt in my mind as to 

 the identity of the forms from the antipodal region of the earth's 

 surface. The only other known species of Palsemonella, P. orientalis 

 (Dana), is likewise an inhabitant of the Sooloo Sea (Dana, op. cit. ; 

 Spence Bate, Challenger Reports, Zoology, XXIV, p. 786). 



Palaemon affinis, Milne-Edwards. 



Numerous specimens from shallow water, Castle Harbor. All are 

 exactly like one another, except in the number of teeth on the beak, 

 which may be 8 above and 4 below, or in the relations of 8-3, 7-3, 

 9-3, and 9-4. This character is manifestly a very variable one, and, 

 therefore, of little or no value from a classificatory point of view. 

 The specimens agree well with the descriptions and figures of A. 

 affinis, although that species has hitherto been recorded, as far as I 

 am aware, only from the Pacific (obtained by Dana off New Zealand) 

 The species is near to the Eurafrican P. squilla, but yet sufficiently* 

 distinct to permit of ready recognition as only an allied form. 



It is remarkable, in view of the distribution and the number of 

 specimens that we obtained of this species, and the position of the 

 island group, that we should have failed to obtain any individuals 



