Descriptian of Genei'a and Species. 77 



the first segment ai-e comparatively small, and are overlapped onh' 1jy the postero-lateral 

 extension of the carapace, while they in turn overlap on to the epimera of the second 

 segment. Those of the second segment are the largest and deepest of all, and in turn 

 overlap on to those of the third, and this order is maintained by all the others 

 in succession, the epimera at the same time decreasing in depth iu the same order. The 

 segments are well facetted along the anterior part of the tergites for rolling, and along 

 the antero-lateral sides of the epimera to allow of overlapping. 



The telson has the usual tumid basal part in front, is applanated behind, divided 

 down the median line by the usual broad groove, and terminates in a small pointed lobe. 

 On each side of the central groove a narrow fluted and keeled heart-shaped area in bas 

 relief extends from near the anterior margin back so far that the pointed end terminates 

 at the base of the median lobe, where it forms the articulation for the accessory 

 swimmerets. These are moderately large, linguiform, and have a median strengthening 

 keel They are curved gently outwards, the margins being set with seta3. 



The appendages of the trunk that have been observed are as follows : — -The eye is 

 large and short-stalked, and is usually found crushed lying partly overlapped by the 

 broad wings of the .short rostral protuberance (fig. 5). The antemnilar peduncle is 

 extremely massive. The long proximal joint is hollowed out and flattened for the eye, 

 and then becomes cylindrical, but bears a slightly crenulated ridge, which was probably 

 ciliated. The mid-joint is subquadrate as seen crushed, and the terminal joints still 

 smaller and narrower, and gives off two flagella of nearly equal length, the external one 

 being somewhat the more massive of the two. Two joints of the base of the antenna 

 are shown in fig. 2, the carapace being broken away. The proximal joint is long and 

 massive, but as only the upper side is exposed there is no opportunity of observing 

 whether it is pierced for the opening of the " green gland." The second joint is smaller 

 and bears the scale, which is lonij- and of the usual construction, with strengthening 

 keel spine. It extends to the end of the second joint of the autennular peduncle. The 

 peduncle of the flagellum is slender and long-jointed, and about as long as the scale. 

 The flagellum has not been observed. Only the bases of the trunk limbs have been 

 observed. Seven of these are shown in fig. 1 . 



Of the appendages of the tail, only the pleopods of the first two segments and the 

 uropods have been observed. The pleopods of the first and sei-ond segment (fig. 1) are 

 fortunately those of the male, which are of the usual massive type and evidently modified 

 for sexual purposes, but the details of their distal joints is not shown. The basal joints, 

 however, are particularly massive and muscular. The uropods are of the usual type 

 and call for no special notice, except that they extend a little beyond the tip of the tel- 

 son, as seen in figs. 3 and -i. 



