474 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



Legs rather long; the three basal joints are short and stout, the 

 second longest; the three following joints are nearly equal, each about 

 as long as the three basal joints united ; tarsus small, about one-fourth 

 the propodus ; the latter is strongly curved and armed below with a series 

 of short stout spines ; dactylus about half the propodus, stout and curved ; 

 auxiliary claws more than half the dactylus. The entire surface of the 

 legs and body is scabrous with numerous pointed hairy tubercles often 

 tipped with spines ; the lateral processes of the body have three or four 

 of these tubercles near the exterior margin ; the largest are on the basal 

 joints of the legs ; on the other joints they are much smaller. The legs 

 are throughout hfiiry and most of the hairs are borne on prominent tub- 

 ercles. Color of alcoholic si^ecimeus light brown. Length 2.G millime- 

 ters; extent 8.4 millimeters. 



The egg-masses of a male specimen from Eastport, Maiue^ contain 

 embryos recently escaped from the egg. The antennoe of these are 

 enormously large and strongly chelate. The basal joint bears, at its 

 extremity, on the outer side, a long spine. The two remaining aj)- 

 pendages consist of two basal joints and a long, slender, acute terminal 

 one, bearing a spine near its middle. The body is nearly hemispherical 

 and without trace of segmentation. Eudiments of the eyes have ap- 

 peared. The rostrum is rounded-conical and much smaller than in the 

 adult. 



There can be, I think, no doubt of the identity of this form with Stimp- 

 son's Zetes spinosa. Its most closely allied European representative is 

 A. ccJdnafa Hodge [Annals and Magazine of Il^atural History, 3d series, 

 vol. xiii, ]N"o. Ixxiv, p. 115, pi. xii, figures 7-10, 18G4], and I at first 

 thought it was identical with that species. A comparison of A. spinosa 

 with three specimens of A. ecMnata from Heligoland, received from Pro- 

 fessor Semper, shows the two species to be perfectly distinct. The lat- 

 ter species has a slender, tapering rostrum of a very different shape ; 

 the peculiar conical spinous tubercles upon the legs are much more nu- 

 merous, larger, and more slender; the abdomen is much shorter and 

 stouter. Moreover, in A. ecliinata the second joint, in at least the two 

 posterior pairs of legs, has a very prominent, rounded^ hairy tubercle, 

 projecting from the lower and posterior side, which is wanting in our 

 species. 



This species ranges from Grand Manan, N. B., to Block Island Sound, 

 though it appears to be peculiarly a northern form, being represented 

 south of Cape Cod, thus far, by a single specimen. At Eastport, Me., 

 it is very common upon Hydroids, Ascidians, and other animals, and 

 under stones near low-water mark; in Casco Bay it is also frequently 

 found under similar circumstances. A single specimen was dredged by 

 the U. S. Fish Commission, off Block Island, August 30, 1874, 34 

 fathoms, mud, which is the most southern locality recorded, and also 

 the greatest depth. 



