REPORT ON THE SOHIZOPODA. 41 



Habitat. — The two specimens of this species procured by the Challenger Expedition 

 were taken in the same locality, south of Amboina, in the Banda Sea. 



Station 195, October 3, 1874 ; lat. 4° 21' S., long. 129° T E. ; depth, 1425 fathoms ; 

 blue mud ; bottom temperature, 38°'0. 



7. Gnathophausia affinis, G. 0. Sars (PI. V. figs. 7-10). 



Onathophausia affinis, G. O. Sars, Preliminary Notices on the Challenger Schizopoda, No. 7. 



Specific Clmracters. — Form of body more slender than in the last species. Carapace 

 comparatively small, not covering completely the last segment of the trunk. Dorsal 

 spine rather short, not projecting beyond the first caudal segment. Rostrum shorter 

 than carapace, exhibiting a very close and delicate armature of small denticles, continued 

 above to its very base. Supra-orbital spines not very strong, and somewhat diverging ; 

 antennal and branchiostegal spines inconspicuous. Caudal segments not keeled above, 

 nor provided with dorsal processes ; posterior lappet of epimera rounded at the tip. 

 Antennal scale narrower than in Gnathophatma unllemoesii, its terminal lobe greatly 

 surpassing the spine of the outer corner. Telson and uropoda nearly the same as in 

 Gnathoi^hausia willemoesii. Length, 81 mm. 



Remarks. — This species is very closely allied to Gnathophausia willemoesii, but 

 apparently distinct, difi'ering, among other characteristics, in the form and armature 

 of the rostrum, the much smaller supra-orbital spines, and the absence of distinctly defined 

 antennal spines ; the caudal segments, moreover, are not keeled above, as in that species, 

 and they have the posterior kppet of the epimera rounded at the tip. 



Description. — The solitary specimen procured, and erroneously referred by the late 

 Dr. V. Willemoes-Suhm to Gnathophausia. zoea, is a female, with distinct though rather 

 small incubatory lamellae. It measures 81 mm. in length. 



The form of the body (see figs. 7, 8) is somewhat more slender than that of 

 Gnathophausia willemoesii, the anterior division being far less tumid than in 

 that species. 



The carapace does not completely cover the trunk, the last segment of which appears 

 in part exposed behind its posterior margin. Both lateral keels are distinctly marked, 

 but the lower one disappears at a short distance within the inforo -posterior corners 

 of the carapace, without, as in Gnathophausia willeinoesii, being continued upwards. 

 The dorsal keel, too, is, as in that species, distinctly marked along the whole back of 

 the carapace, though a small impression may be seen above, at a short distance behind 

 the rostrum. The dorsal spine is rather short, not reaching beyond the first caudal 

 segment. The rostrum does not attain the length of the carapace, but is somewhat 

 coarser in structure than that of Gnathophausia willemoesii. It is closely armed 

 with a very considerable number of exceedingly small denticles, continued along 



(ZOOL. CHALL. EXP.— PART XXXVII. 188-5.) Oo 6 



