A SMALL TKLBE 211 



CHAPTER XV 



TRIBE V. STENOPIDEA 



THE carapace is produced to a laterally compressed ros- 

 trum. The first antennae have two flagella, the second 

 have a scale. The mandibles have a three-jointed palp. 

 The exopod of the third maxillipeds is small, slender, and 

 almost rudimentary. The first three pairs of trunk-legs 

 are chelate, the third pair being the longest and largest. 

 The branchiae are filamentous ; only the second maxillipeds 

 have a podobranchial plume ; the hindmost pleurobranchial 

 plume is the largest. The first pair of pleopods is one- 

 branched and foliaceous ; the uropods and telson have no 

 transverse suture. 



Family Stenopidce. 



This being the only family has the characters of the 

 tribe. It contains two genera long included among the 

 Penseidee, with which they agree in having the third pair 

 of trunk-legs larger than the two preceding pairs, but sepa- 

 rated from that group by the structure of the branchias. 

 Of the third genus now transferred to this family, the 

 branchias have not been described. 



Stenopus, Latreille (in Desmarest), 1825, has a long, 

 flat, obtusely pointed scale on the second antennas, the 

 third trunk-legs long and slender, the fourth and fifth pairs 

 with the antepenultimate joint subdivided, the telson taper- 

 ing. The genus ranges from the eastern to the western 

 hemisphere and from the Arctic regions to the tropics. 

 8tenopus liispidus (Olivier) is recorded from the Pacific, 

 from Bermudas, and perhaps from Greenland. Spence 

 Bate's figures of this species are reproduced on a re- 



p 2 



