852 



THE VOYAGE OF H.M.S. CHALLENGER. 



First pair of antennae Laving the flagella slender, the outer branch a little more 

 robust than the inner, and both about half as long again as the rostrum ; the first joint 

 of the peduncle carries a sharp stylocerite that reaches as far as the second joint. 



Second pair of antennae carrying a scaphocerite that reaches a little beyond the 

 peduncle of the first pair and terminates in a sharp point; the flagellum is longer than 

 the animal. 



First pair of gnathopoda subpediform and terminating in two branches implanted side 

 by side on the extremity of the preceding joint. 



Second pair of gnathopoda pediform, long and slender, having the penultimate joint 

 armed with fine stiff spines on the anterior and outer margins, as also on the preceding 

 joint. 



First two pairs of pereiopoda similar in form and terminating in two long and slender 

 fingers, equal in size and similar in form, and fringed with ciliated hairs ; the carpos 

 carries a few long spines on the anterior margin and hairs on the posterior. Posterior 

 three pairs fringed with strong teeth on the posterior margin, and terminating in a short, 

 sharp, curved, smooth dactylos. 



Ehipidura broadly expanded ; peduncle armed with a strong tooth ; outer plate 

 having a diaeresis defined by a strong tooth and long spine. 



Length, entire, 



of carapace, 



of rostrum, 



of pleon, 



of third somite of pleon, 



of sixth somite of pleon, 



of telson, 



28 mm. (LI in.). 



8 

 10 

 20 



3 



3-5 



4 



Habitat.— Station 171, July 15, 1874; lat. 28° 33' S., long. 177° 50' W.; north of 

 the Kermadec Islands ; depth, 600 fathoms ; bottom, hard ground ; bottom temperature, 

 39°'5. Two specimens ; one male, one female (?). Trawled. Associated with Stylo- 

 dactyhis orientalis, Bcnthesicymus, and Hemi'penseus. 



The two specimens correspond so closely in general form and in most of the details, 

 that it is difficult to believe that they are not one and the same species, but the 

 differences between them are the same in kind as those which distinguish them from 

 the specimen obtained by Agassiz in the West Indies, namely, the relative length of 

 the rostrum and the general armature of the animal. 



In the specimen from which our figure and description are taken, the rostrum is 

 longer than the carapace in the proportion of 10 mm. to 8 mm., measuring from the 

 orbit, and the number of spinules on the upper margin is twenty-seven, and on the 

 lower fourteen. In the larger specimen taken at the same station the relative lengths are 



