Description of Genera and Species. 71 



tliose of tlie second, and overlap on to those of the succeeding segment, and this order is 

 carried out in backward succession, the epimera at the same time becoming smaller. 

 Those of the fifth segment are bluntly pointed and directed backwards. Those of the 

 sixth trunk segment are quite small and do not continue back to the posterior margin. 

 The ventral parts of these segments are very firmly constructed, and the attachment for 

 the pleopods large and somewhat far asunder. The last segment is closed in (piite 

 across the ventral part. 



The telson is small and much shorter than the fiauking uropods. It is tumid 

 towards the base, flattened out behind, and divided by a median groove. Wliether it is. 

 forked at the end or liad a median terminal lobe there is no means of deciding from the 

 specimens at command. It is probable that this projection existed, as it does in so 

 many of its fossil and recent congeners. Articulations for the attachment of the small 

 swimming plates are seen in specimen from which fig. 9 was taken. The position of the 

 anal opening is also well seen placed just behind the swollen part of the telson. 



The appendages of the trunk are well preserved in two of the si)ecimens. The eye 

 is large and the stalk very short, for the crushed cornea is usually to l^e found at the 

 very front margin of the carapace. From the large area covered by the crushed cornea 

 it may have been reniform, but there is not sufficient evidence to prove the point. The 

 peduncles of the antennules are exceedingly large and massive, as they are in all the 

 species of this genus, and are nearly as long as the carapace. The base of the proximal 

 joint is hollowed out to receive the large eye, beyond wliich it becomes 

 cylindrical, though it appears to ])e traversed longitudinally by ridges which wei'e 

 probably ciliated. The other two joints are short in (;omi)arison to the first, the 

 terminal one being the shortest. The flagella are both very puny compared with the 

 propodite, and were probably both short, though they are broken in the sipecimen that 

 exhibits them. The antenna has the usual scale set upon a basal joint, the only part 

 of the peduncle seen outside the carapace. The scale is caridean in structure, with the 

 marginal thickening and spine, and with the terminal lobe set round its iimer side and 

 tip with seta3. It extends to just beyond the end of the first joint of the peduncle of 

 the anteimules. The peduncle of the Hagellum of the antenna is long and slender, 

 and extends beyond the tip of the scale. The tiagellum is comparatively slender and 

 only slightly more massive than the flagella of the antenimle. The position of the 

 body of the mandible is indicated as usual crushed up through the carapace. It is 

 evidently set at a greater angle to the long axis of the body than in Anthracophausia, 

 though considerably ofl" the vertical, as might he expected when the shortness of the 

 trunk is considered. 



