76 



aS. 1. Smith — Crustaceans of the Atlantic Coast. 



Locality. 

 Cashe's Ledge, 



Halifax, 



Mass. Bay, 

 Cashe's Ledge. 



Sex. 



6 



Norway, 

 Casco Bay, 

 Grand Menan, 



Length. 

 15-Omm 



14-3 



12-0 



17-5 



18-0 



19-0 



21-8 



21-3 



24-0 



22-6 



29-0 



32-6 



35-5 



37-0 



Rostrum. 



3 + 7 

 3 



3 + 5 

 2 



2 + 3 

 1 



4 + 7 

 3 



3 + 6 

 4 



4 + 5 

 4 



3 + 6 

 4 



4 + 7 

 6 



4 + 4 



5 

 4 + 6 



7 



3 + 5 

 6 



4 + 6 



Supraorbital spines each side. 

 Two. 



Two, one very smalL 



One only ! 



Two, one very small. 



[ble. 

 Two, one scarcely percepti- 



One only 1 



Two well-developed. 



4 + 6 



5 

 4 + 6 



The form of the telson and the number of its dorsal aculi and ter- 

 minal spines was usually very constant in all the specimens examined. 

 In thirty-five out of forty-four individuals there were four pairs of 

 aculi, or four upon one side and five upon the other: of the remainder, 

 six (two males, 21 and 26'"'" long, and four females, 19 to SG-S'""" 

 long) had five pairs ; a male of 25"^"', five upon one side and six 

 upon the other; a female of 37'"™, four upon one side and three upon 

 the other; and a female of 25-5'"'", only three pairs. In thirty-seven 

 specimens in which the spines of the tip were specially examined, only 

 one (a female 36"^'" long, from Halifax, Nova Scotia, and in all other 

 respects perfectly normal) varied from the normal number, this speci- 

 men having three small ciliated spines in the middle in place of the 

 two in normal specimens. This is a case precisely similar to that 

 noticed under H. Gaimardii, and figured on Plate IX, figure 9, 

 except that in this case there seems to be no variation whatever in 

 the form of the terminal margin itself. 



In life the males at least are semi-translucent, and specked and 

 irregularly mottled with obscure brownish red on the carapax and 

 appendages. 



