862 



THE VOYAGE OF H.M.S. CHALLENGER. 



Leptochela robusta, Stimpson (PL CXXXIX. figs. 3, 4). 



Leptochela robusta, Stimpson, lor. cit, p. 112. 



" Animal robust, slightly compressed. Carapace carinated. Eostrum slender, 

 shorter than the ophthalmopoda. 



" First pair of antenna? scarcely longer than the carapace, having the peduncle robust. 



" Second pair of antennae having the scaphocerite broad but acutely triangular. 



" Mandibles having the psalistoma undivided. 



" Pereiopoda broad. 



" Pleon having the antepenultimate (fifth) somite neither carinated nor armed with 

 a spine. Generally resembles Leptochela gracilis, but is much more robust. 



" Length one inch" (Stimpson). 



The preceding is a translation of Dr. Stimpson's diagnosis of the species. The speci- 

 mens in the Challenger collection are not as a rule so large, although some of them are 



Habitat.— Station 162, April 2, 1874 ; lat, 39° 10' 30" S., long. 146° 37' 0" E. ; off 

 East Moncceur Island, Bass Strait ; depth, 38 fathoms ; bottom, sand and shells. 

 Sixteen specimens ; males, and two females with ova. 



In June 1874 a single specimen w T as taken, probably a little south of Sydney, and near 

 the surface, since it was preserved in the same bottle with the Zoese and young of other 

 species. 



Dr. Stimpson obtained his specimens at the depth of 20 fathoms in the China Sea, and 

 also near the Loo Choo Islands. 



This species corresponds with Leptochela gracilis very closely in all important struc- 

 tural characters, excepting that the fifth somite is not produced jjosteriorly to a point. 



The sixth somite is rather shorter, and has a very small tubercle on the anterior 

 dorsal surface. 



There is a close resemblance in the form of the appendages to those of the two 

 previous species. 



It differs from the description given by Stimpson, with which it coincides in many 

 points, in having the rostrum as large as the ophthalmopoda, the longer flagellum of the 



