l68 CONNECTICUT CliOL. AND NAT. HIST. SURVEY. [ BuU. 



Siphonoecetes Kroyer. 



Body slender and narrow, abdomen very small. Coxal plates 

 very small. 



AntemiEe densely setose and unequal; first pair slender and 

 without accessory flagellum; principal fiagellum well developed. 

 Second pair much longer than first, subpediform, with short 

 flagellum armed apically with unguiform spines. 



Mandibular palp small, uniarticulate. 



Gnathopods unequal, the second pair being considerably 

 stronger than the first pair and distinctly subchelate. Anterior 

 pairs of pereiopods with basal joint and merus much expanded; 

 third and fourth pereiopods comparatively small, with dactyl 

 inverted; last pair considerably more elongated and with basal 

 joint lamellarly expanded and fringed on both sides with ciliated 

 setae. 



First and second uropods biramous, with outer ramus the 

 larger and spinulous externally. Last pair with peduncle lami- 

 narly expanded; single ramus small, simple, setiferous. 



Telson imperfectly defined from last segment, smooth above 

 and broadly rounded at tip. 



Siphonoecetes smithianus Rathbun. 



1874. Siphoncccetes cuspidatus, Smith, Rep. U. S. Com. 

 Fish., 1871-2, p. 566. 



1905. Siphonoecetes smithianus, Rathbun, Occas. Papers, 

 Boston Soc. Nat. Hist., vol. 7, p. 74. 



Head produced- into a long, slender, acute rostrum, inter- 

 antennal lobes long, projecting in a rounded form at the end 

 and somewhat constricted at the base. Eyes situated on inter- 

 antennal lobes. 



First antennae of female extending as far as penultimate 

 joint of peduncle of second antennae; first joint of peduncle 

 stouter than succeeding ones, but subequal in length to each 

 of them; flagellum of about four joints and one-half as long as 

 peduncle. Second antennae two-thirds as long as body; peduncle 

 stout, third joint as long as first joint of peduncle of first antennae, 

 fourth joint longer than fifth which in turn is nearly one-half 

 longer than the third; flagellum slightly longer than third joint. 



