272 REPORT OF COMMISSIONER OF FISH AND FISHERIES [566 | 
Sound, among masses of a large compound Ascidian, (Amouroucium pel- 
lucidum,) in eight to ten fathoms, off Nobska Point, are probably this 
species, but unfortunately females only were obtained, while Say de- 
scribes and figures the male alone. In our specimens, the antennulze 
and antenne are spotted with very dark purplish-brown, the anterior 
part of the body almost black, the middle and posterior portions spotted 
with black, or very dark purplish brown. They are between 4 and 5™™ 
long and inhabit unattached tubes as described by Say. The tubes are 
regularly cylindrical, quite thin and delicate, black, about 5™™ long, and 
0.4™™ in diameter, and are carried about by the animal very much as the 
larvie of some of the Phryganeide carry about their tubes in fresh water. 
In the structure of the caudal appendages, our specimens are quite differ- 
ent from the species usually referred to Cerapus, but I have not thought 
best to make any changes in nomenclature until the discovery of the 
male shall make it certain whether our specimens belong to the species 
deseribed by Say. 
COROPHIUM CYLINDRICUM Smith. (p. 370.) 
Podocerus cylindricus, Say loc. cit., p. 387, 1818, (not of Bate, Catalogue Amphip. 
Crust. Brit. Mus., p. 256.) 
New Jersey to Vineyard Sound. Very abundant among weeds and 
hydroids about piles of wharves, and almost everywhere in shallow 
water. 
Length, about 4"™. 
SIPHONGCETES CUSPIDATUS Smith, sp. nov. (p. 501.) 
Male: Head produced into a long, slender, acute rostrum, and each 
side between the antennula and antenna into a long Jobe rounded at 
the end where the eye is situated, and contracted toward the base. 
Antennula reaching about to the middle of the fourth segment of the 
peduncle of the antenna; segments of the peduncle equal in length ; 
flagellum scarcely longer than a segment of the peduncle, and composed 
usually of five segments. Antenna a little longer than the body; third 
segment of the peduncle alittle longer than any segment of the peduncle 
of the attennula; fourth segment nearly twice as long as the third ; last 
segment nearly one-half longer than the third; flagellum a little shorter 
than the last segment of the peduncle. Legs much like Kroyer’s fig- 
ures of S. typicus, those of the first pair with the carpus twice as long 
as broad; propodus slightly narrower and a little longer than the car- 
pus, the posterior edge furnished with long hairs and several stout spines. 
Legs of the second pair much stouter. Posterior caudal stylets with 
the terminal process fully as long as the ramus itself, the ramus as broad 
as long, the extremity obtusely rounded and furnished with very long 
hairs. Telson broader than long, transversely elliptical. 
In the female the antennz and second pair of legs are more slender 
than in the male. 
In aleoholic specimens the antennule are marked with narrow bands 
of black or dark brown upon each segment of the Hagellum and at 
