155 



f. Scaphocerite longer, nearly two-thirds the length of 



the carapace. 



g } Rostrum about i 3 / 4 -times the length of the carapace. 



Orbital spine as large and projecting just as far as 



the branchiostegal spine. The blunt carina of the 3 rd 



abdominal tergum posteriorly acutely produced to 



a bluntish point. Dactyli of 3 posterior legs short lo7igirostris Mac Gilchrist 

 (A. C. Mac Gilchrist, in : Annals Mag. Nat. Hist. Ser. 7, Vol. XV, 

 1905, p. 237.) 



g ü Rostrum little longer than the carapace. 



Branchiostegal spine much longer and more advanced 

 than the orbital. Abdomen as in Heter oc. vicarius 

 Faxon, only the 3 rd tergum being crested and 



that bhmtly signatus Rathb. ] ) 



(M. J. RATHBUN, in: U.S. Fish Commission Buil. for 1903, Part III, 

 Wash. 1906, p. 91S, PI. XXI, fig. 6.) 

 d s Branchiostegal spine short, not reaching beyond the 2 ntl 

 joint of the antennal peduncle and projecting less 

 forward than the orbital. 



//, Dactyli of the three posterior legs long and slender, 

 those of the 3 rd pair measuring about one-third 

 the length of the propodi. 

 ïj Upper margin of the rostrum proper armed with 



7 or 8 teeth tricarinatus Alcock & Anderson 



L Upper margin of the rostrum proper armed with 



2 or 3 teeth gibbosus Bate. 



//, Dactyli of the three posterior legs short and stout, 

 those of the 3 rd pair measuring one-sixth to 

 one-eighth the length of the propodi. 

 Rostrum strongly recurved, as long as the carapace, 



6 t + 3 -dentate Icpidus de Man 



a a _ Some of the abdominal terga are sharply carinated and 

 some carinae of them are produced posteriorly into over- 

 hanging spines. 

 b x The 3 rd and 4 th abdominal carinae are produced as spines. 

 c x First and second abdominal terga not sharply carinated. 

 First tooth of postrostral crest placed a little anterior 

 to the middle of carapace. 

 d x Spine of 4 th abdominal tergum more than half as long 



as that of 3 ,d ensifcr A. M.-Edw. 



1) The length of the dactyli of the three posterior legs is not mentioned in the description and caDnot be ascertained fiom 

 the photograph. 



