80 Description of Genera and Species. 



Crangopsis minuta sp. nov. PI. XL, figs. 16-18. 



Specific Characters. — Very small form, resembling the last species, but only 5-8 mm. 

 long ; carapace more than one-third the length of body ; telson very short, not half the 

 length of that of the uropods. 



General Description. — This small form resembles C. robusta in many respects, but 

 is altogether more slender in its build. Its carapace is longer ai^d narrower relatively 

 to the rest of its body. The tail is constructed in the usual manner, and each segment 

 bears epimera. The sixth tail segment is especially long and narrow. The telson is also 

 constructed after the manner of the preceding form, but is much smaller relatively to 

 the uropods. 



The eyes are large and conspicuous, and are usually found at the edge of the carapace, 

 wliich is without any conspicuous rostrum, while a fold is usually seen just behind the 

 eye. This should not be confounded with the cervical one. The antennule is, 

 as usual, largely developed and conspicuous ; there is the usual massive peduncle in 

 three joints, the proximal joint being longer than the other two combined. The 

 peduncle ends in two short Hagella. The antennal scale is rather broader and not so 

 long relatively as in the former species. The flagellum of the antenna has not been 

 observed, neither have any of the other appendages of the trunk. 



In the appendages of the tail there seems to be the usual difference in the pleopods 

 of the first two segments in the different sexes. Fig. 16 shows what is evidently a male, 

 and fig. 17 a female. In the former case the basal joints of the first two pairs are much 

 larger than the others, while in the latter case those of the second tail segment are not 

 so appreciably larger than the three succeeding ones. The uropods are of the usual 

 type, but, as already stated, they extend far beyond the tip of the telson (fig. IS). 



Locality. — Coomsdon Burn, Eede Water, Northumberland. 



Horizon. — Calciferous Sandstone Series. 



Collector. — J. Rhodes. 



Crangopsis eskdalensis (B. N. Peach). PI. XL, figs. 1-7. 



1882. Palaeocrangon eskdalensis B. N. Peach. Trans. Eoy. Soc. Edin., vol. 

 XXX., p. 84, pi. viii., figs. 9-9i. 



Remarks. — There are a great many specimens of this form in the collection of the 

 Geological Survey of Scotland collected by Mr. Macconochie, some slabs being crowded 

 with them, but there are not any in better state of preservation than those raade use of for 



