566 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



Sound, among masses of a large compound Ascidian, {AmourQucium iwl- 

 lucidum,) in eight to ten fathoms, oft' 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 antennulse 

 and antennae are spotted with very dark purplish-brown, the anterior 

 I)art 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 

 Q 4mm ly^ diameter, and are carried about by the animal very much as the 

 larvae of some of the Phryganeidse 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 Cerajms, 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 

 described by Say. 



COROPHIUM CYLINDRICUM Smith, (p. 370.) 



Podocerus cylindricus, Say loc. cit., p. 387, 1818, (not of Bate, Catalogue Aiuphip. 

 Crust. Brit. Mus., p. 256.) 



New Jersey to Vineyard Sound. Yery abundant among weeds and 

 hydroids about piles of wharves, and almost everywhere in shallow 

 water. 



Length, about 4™"^. 



SiPHONCECETES CUSPIDATUS Smith, Sp. UOV. (p. 501.) 



Male: Head produced into a long, slender, acute rostrum, and each 

 side between the antennula and antenna into a long lobe rounded at 

 the end where the eye is situated, and contracted toward tlie 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 a little longer than any segment of the peduncle 

 of the attennula 5 fourth segment nearly twice as long as the third ; last 

 segment nearly one-half longer than the third 5 flagellum a little shorter 

 than the last segment of the peduncle. Legs much like Kroyer's fig- 

 ures of 8. 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 tlian long, transversely elliptical. 



In the female the antennjc and second pair of legs are more slender 

 than in the male. 



In alcoliolic specimens the antennulie are marked with narrow bands 

 of black or dark brown upon each segment of the llagellum and at 



