524 THE VOYAGE OF H.M.S. CHALLENGER. 



depth, 1875 fathoms; bottom, blue mud; bottom temperature, 35°"3. One specimen, 

 female. Trawled. Length, 74 mm. 



Station 331, March 9, 1876; lat. 37° 47' S., long. 30° 20' W.; South Atlantic, 

 between Buenos Ayres and Tristan da Cunha ; depth, 1715 fathoms ; bottom, Globigerina 

 ooze; bottom temperature, 35°'4. One specimen; female, bearing ova. Trawled. 

 Length, 87 mm. 



This species bears a close resemblance to Ghjphocrangon granulosis, but the 

 rostrum is comparatively longer, reaching quite to the extremity of the peduncle of the 

 first pair of antennae ; it is armed on each side with three teeth, of which the anterior is 

 long, slender, and situated considerably in advance of the eyes, the second is on a line 

 with the orbital margin, and the third is situated close behind the second ; still further 

 back, on the ridge continuous with the lateral margin of the rostrum, is another large 

 tooth. Running along the centre of the rostrum is a minutely elevated thread-like line, 

 as in most species of this genus ; in this species it becomes more conspicuous on the 

 frontal region, and gradually passes into a row of small tubercles on the anterior portion 

 of the gastric region, where it gradually fades away. The several carinse on the dorsal 

 and lateral surfaces of the c&rapace are more or less tuberculated, and assume a denticu- 

 lated appearance on the former. The intercarinal surface as well as the hepatic and 

 branchial regions are thickly covered w T ith coarse granulations. 



The pleon corresponds nearly with that of Glyjihocrangon granulosis, but has certain 

 details more decidedly pronounced. The teeth at the extremity of the lateral coxal 

 plates are rather longer, and the boss or large protuberance that corresponds externally 

 with the articulation of the pleopoda on the inner surface is armed with a strong 

 tooth. 



The telson is longer than the lateral plates of the rhipidura, is dorsally deeply 

 channelled, and has the lateral margins smooth. The appendages have no specific dis- 

 tinctive character, excepting that the ophthalmopoda are rather smaller, and the dactylos 

 of the posterior pair of pereiopoda (fig. 4o) is broad, flat, and bifid or cleft at the ex- 

 tremity. Of the two specimens taken at Station 300 one is about twice the size of the 

 other. The larger is that from which the description and figure were taken, whereas the 

 smaller, though corresponding with it in every essential detail, differs somewhat in the 

 degree of the development of several parts, more particularly in the absence of a tooth on 

 the bosses attached to the outer surface of the coxal plates of the pleon. 



In the middle of the South Atlantic, at Station 331, another specimen was trawled 

 which was nearly 87 mm. long, and has no teeth on the bosses of the coxal plates of 

 the pleon. Another specimen about the same length was trawled at Station 237, in which 

 teeth on the lateral bosses of the pleon are present. This animal is well developed, and 

 is a female laden with about thirty large ova. 



