266 



disappears: I do not know whether this fissure has already been observed in other species 

 of this genus. 



The abdomen, telson included, is three times as long as the carapace, rostrum included, 

 in Pont. occidentalis, however, only two and a half times, but for the rest it seems to agree 

 with this species. The 6 ,h somite, that measured in the full-grown female one-fifth the length 

 of the abdomen, while in the male and the other younger specimens it is a little longer, is 

 not yet 5-times as long as thick in the middle; its upper border is rounded or flattened, rarely, 

 like in the male and in an ova-bearing female from Stat. 45, slightly concave. 



Telson a little longer than the 6 th somite, in young specimens slightly shorter than it, 

 somewhat grooved anteriorly, flattened posteriorly, with two pairs of small spinules, of which 

 the anterior is implanted a little behind the middle of the telson, the posterior a little farther 

 distant from the anterior than from the tip. The acute extremity of the apex is flanked at 

 either side by three pairs of spines, like in Pont. gracilis (Th. R. R. Stebbing, South African 

 Crustacea, Part. III, 1905, p. 95, PI. XXV); the submedian pair, by far the longest, 1,16 mm. 

 long in the adult female, about one-seventh the length of the telson, and fringed with 

 fine setae, the second pair a little less than half as long, the third pair at the posterior 

 extremity of the lateral margins very short, measuring one-seventh the length of the sub- 

 median pair. The inner uropods are as long as the telson, the terminal spinules included, 

 the outer reach only to the tip, but sometimes both the inner and the outer are a little 

 shorter. In the male, long 35,5 mm., from Stat. 300, the spines of the submedian pair are 

 0,8 mm. long, one-eighth the length of the telson, those of the 2 nd pair 0,48 mm., a little 

 more than half as long, the 3 rd pair, finally, 0,15 mm., almost one-fifth the length of the 

 submedian pair. 



The eyes are large, comparatively as large as those of Pont. gracilis S. I. Smith, 

 and much larger than those of Pont. abyssi: in adult specimens, both male and female, the 

 carapace, rostrum included, is namely 5,1 — .5,8-times as long as the greatest diameter of the 

 eye, in the typical female of Pont. gracilis from the east coast of the United States this number 

 is 5,6, but in Pont. abyssi S. I. Smith it varies from 9,4 to 10,4. In one of the two ova- 

 bearing females from Stat. 45 the eyes are anteriorly and on the inner side of a pale straw 

 colour, the colour of the outer side is a little darker, in the other female they are mouse- 

 coloured, though on the inner side lighter, in the young specimen, finally, they are slate-coloured, 

 the inner margin even blackish ; in the two specimens from Stat. 88 the eyes are light leather- 

 coloured, but in the younger one there are 2 or 3 yellow-brown spots on the outer posterior 

 half; the young female from Stat. 178 has the same light leather-coloured eyes as those from 

 the preceding Station. The eyes of the young female from Stat. 2 1 1 present a different 

 colouration, the anterior half is of a light, almost milky, sea-green, the posterior is much darker, 

 greenish. Of the male from Stat. 300 the eyes are of a uniform, light leather colour; the speci- 

 mens from Stat. 316, however, are of a darker colour than the preceding, the drab colour of a 

 hazelnut, with the inner margin blackish; in one ova-bearine female the rieht eve is marked 

 posteriorly on the outer side with two small brown spots, while of the left the posterior half is 

 brown. When these observations are compared with the depths, at which the specimens were 



