-r L^ 



^ 



u 



HALIPORUS NEREUS. 



189 



from Pcncopm^ although it is said to have but one arthrobranchia on the 

 eighth (second maxinipedal) somite. Xvijhopcmus Smith "^ is distinguished 

 from Pencopm by the long styliform posterior legs, the absence of gills on 

 the posterior thoracic somite;, etc. 



HALIPORUS Ba 



TE. 



Ami. Mag. Nat. Hist., 5ili Scr., VIll. 185, 1881 ; Rep. Challenger Macrura, p 284, 1S8S. 



^. 





> 



r>r. 



8^, 



Haliporus nereus Fax. 



Plate XL VIIL, Fig. 1-1\ 



Eull. Mus. Conip. Zo5l., XXIV. 213, 1893. 



Integument membranaceous. Carapace lightly granulated. Rostrum 

 about one third the length of the rest of the carapace, horizontal, armed 

 with six teeth above (the hindmost one situated a little back of the orbit), 

 ciliated below. Median dorsal line of carapace carinatc, with two teetli on 

 the posterior half of the gastric region. The sides of the carapace are armed 

 with spines as follows: two on the antero-lateral margin, one of which is at 

 the lower angle of the orbit (spina antennalis of Stimpsou), the other over 

 against the second antenna, at the anterior end of the cervical groove (spnia 

 branchiostegiana) ; a third spine (spina hepatica) lies on the hepatic region, 

 behind the autennal spine ; a fourth is behmd and on the same level with 

 the branchiostegal spine ; a fifth still further back and on nearly the same 

 level, on the liind edge of the cervical groove. The cervical groove is deeply 

 impressed, and the orbital region is definitely bounded by an hepatic and 

 a gastro-hcpatic sulcus. The hindmost of the lateral spines of the carapace 

 lies in the anterior angle of a triangular field enclosed by branches of the 

 cervical groove. From the infero-posterior angle of this tri;ingle two carince 

 run backward along the branchial area; the upper one ends at the postero- 

 lateral margin of the carapace, tlie lower one meets the inferior sub-marginal 

 carina of the brancliial area before attaining tho posterior border of the 

 carapace. These two carina), with the submarginal ridge of the carapace^ 



i 



enclose a long oval area, which forms a conspicuous figure on the branchial 

 regions. The third to the sixth abdominal segments are carinated, their 

 plcurai broad and rounded. On the sixth segment the carina terminates in 

 a small, acute, horizontal tooth. The sixth segment is twice as long as the 



* Trans. Coim. Acad, of Arts aud Sei., II. 27, 18C9. 



t 







