656 REPORT OF COMMISSIONER OF FISH AXD FISHERIES. 



Dredged in Lake Superior, in company with Gammarus limnccuSy 

 among' CladopJiora, in eight to thirteen fathoms, on the south side of 

 Saint Ignace Island. 



The incubatory lamelhe of the female are very large, projecting much 

 beyoud the epimera of the anterior legs, as in G. recurvatus Grube, 

 (Archiv fiir l:Taturgeschichte, vol. xxxii, p. 410, pi. 10, fig. 1,) which our 

 species much resembles in the form of the antennuUij, antennie, anterior 

 legs, &c., while it differs much in the posterior caudal stylets and in the 

 form of the telsou. 



A single specimen of a male Grangonyx, collected by Mr. J. W. Milner 

 n an estuary of Lake Huron, belongs apparently to this species, but is 

 ver3" much larger, being 14""" in lengtb, so that it is quite probable 

 that the si)ecimens from Lake Superior are all young. This large spec- 

 imen, however, agrees in all essential features with the smaller ones. 



Crangontx vitkeus Packard. 



? ? Sfi/gohromiis vitreus Cope, American Naturalist, vol. vi, p. 422, 1872; Third aud 

 Fourth Auuual Reports of the Geological Survey of Indiana, p. 181, 1872. 



Crangomjx vitreus Packard, Fifth Annual Report of the Peabody Academy of 

 Science, Salem, p. 95, 1873. 



Dr. Packard's specimens were from three different wells in Orleans, 

 lud., and were collected by M. X. EIrod, who says that many of them 

 were in and on buckets that had been in the bottom of the well for sev- 

 eral days. Professor Cope's specimens were from Mammoth Cave, Ken- 

 tucky, but are described in such an unintelligible manner that it is very 

 doubtful whether the}' belong to the saine species, or even genus, as Dr. 

 Packard's specimens. I have, however, followed Dr. Packard in quoting- 

 Professor Cope's name as a synonym. 



Ceangontx tenuis, sp. nov. 



A slender, elongated species, with very low epimera, resembling more 

 in form the species of JSljjhagus than the typical species of Grangonyx. 



Eyes not observable in alcoholic specimens. Secondary flagellum 

 of the autenukie very small, composed of two segments, of which the 

 terminal is very short. 



First and second pairs of legs differing but little in the two sexes. 

 First pair stouter than the second, aud with the palmary margin of the 

 propodus much more oblique; the palmary margin of the propodus of 

 both pairs, and in both sexes, armed each side with a series of stout, 

 obtuse spines, with a notch aud a cilium near the tip. 



First three segments of the abdomen longer than the last three of the 

 thorax ; fourth, fifth, and sixth together scarcely longer than the third. 

 Caudal stylets all extending to about the same point. First pair with 

 the rami subequal, scarcely half as long as the peduncle. Peduncle in 

 the second pair reaching a little beyond the peduncle of the first pair ; the 

 rami very unequal, the outer only half as long as the inner. Posterior 

 pair scarcely as long as the telsonj the single terminal segment very 



