REPORT ON THE CRUSTACEA MACRURA. 497 



Habitat.— Station 192, September 26, 1874 ; lat. 5° 49' 15" S., long. 132° 14' 15" E.; 

 off the Ki Islands, south of Papua; depth, 140 fathoms; bottom, blue mud. One 

 specimen, male. Trawled. Associated with Philonicus lucasii and Pledonika rostri- 

 cresccntis. 



The carapace is furnished with five distinct carinas, which are armed with strong, 

 pointed, but not very sharp, denticulate processes. There is one on the dorsal median 

 line and one on each side, corresponding to the line of separation between the branchial 

 and visceral regions ; these three gradually converge anteriorly towards the rostrum. 

 One on each side passes forwards from the posterior margin of the carapace and 

 terminates in the outer fronto-lateral angle ; these carinas are continuous, except where 

 they are interrupted by the cervical suture, and on them the teeth are larger 

 anteriorly ; there being two large and a small one anterior to the cervical suture, and 

 posterior to it there is one larger, the rest gradually decreasing in size and prominence 

 to the posterior margin. 



The pleon is furnished with an interrupted, median, dorsal carina. 



The first somite has two prominent longitudinal ridges, one on each side of the 

 median line. The second has a median ridge projecting anteriorly in the form of a 

 tooth, and on each side a slightly waved linear prominence that is lost in the posterior 

 margin near the union of the coxal plate with the somite. The third somite has the median 

 ridge more elevated than on the preceding one, and the lateral ridge, which commences at 

 the anterior margin in close approximation to the median carina, gradually diverges 

 posteriorly in a waved line until it reaches the posterior margin, where it is lost. The 

 fourth somite has a median carina posteriorly terminating in a slight point, and flanked 

 by two oblique ridges that terminate in the posterior margin. The fifth somite 

 differs markedly from the anterior four ; it has no central carina, but a strong longi- 

 tudinal ridge on each side, slightly diverging posteriorly and projecting a little be- 

 yond the posterior margin, and on its lateral wall there are also two less important longi- 

 tudinal ridges. 



The sixth somite is also without a median carina, and the two lateral ridges are 

 broken into small cusps ; a little outside of the terminal extremity of which, a sharp tooth 

 projects backwards from the posterior margin. 



The telson is dorsally flat, long, narrow and smooth, having on each side a longi- 

 tudinal ridge that gradually converge to a point. 



On the ventral surface of the pereion (fig. 3), the fifth, sixth and seventh somites are 

 centrally carinated, the carina on the fifth being anteriorly produced to a sharp tooth 

 between the third pair of pereiopoda. 



The five anterior somites of the pleon are each armed in the ventral median line 

 with a long, laterally compressed tooth, of which the anterior is the longest and sharpest, 



(ZOOL. CHALL. EXP. PAET IAI. — 1887.) Fff 63 



