MAURUROUS DECAPODA OF THE SUDANESE RED SEA. 357 



t 



This feature can be distinctly traced in the specimens here dealt with, though 

 the actual carinas are almost obsolete. The three rows of tubercles on the 

 telson are well developed. 



Distribution. Red Sea (Kossman, Nobili, Balss) ; Gulf of Oman and 

 Persian Gulf (Kemp). 



Genus Pseudosquilla. Dana, 1852. 



Pseudosquilla ciliata (Fabricius) . See Kemp, 1913, p. 96. 



Locality. Station II, 1 <J, 50 mm. 



Remarks. This specimen is an absolutely typical example of the species, 

 without a spine on the postero-lateral angle of the fourth abdominal segment, 

 and having the inner spine of the bifurcate process of the uropod slightly 

 longer than the outer. 



Previously recorded from the Red Sea by Nobili, 1906, and Balss, 1910. 



Pseudosquilla megalophthalma, Bigelow, 1894. See Kemp, 1913, p. 103. 



(PI. 27. figs. 1-3.) 



Locality. Station IX. B, 1 ? , 30 mm. 



Remarks. It is with a considerable amount of reserve that I refer this 

 specimen to Bigelow's species. Com pared with his description the following 

 differences are to be noted : — 



(1) The corneal axis of the eye (PI. 27. tig. 2) is only five-sixths of the 

 peduncular axis. In Bigelow's specimen the corneal axis is considerably 

 broader than the peduncular axis (11 to 8). 



(2) The length of the rostrum (PI. 27. fig. 1) is only four-sevenths of the 

 breadth. It is thus shorter than in Bigelow's specimen (where the pro- 

 portions are 5 to 7), and, though it covers the ophthalmic segment, it leaves 

 the whole of the eye itself exposed. 



(3) The lateral margins of the eighth thoracic segment are provided with 

 a well-marked notch. No mention of such a notch is made by Bigelow. 



(4) There are only six spines (PI. 27. fig. 3) on the sixth abdominal 

 segment, there being no trace of the small spines on the inner side of the 

 intermediates mentioned by Bigelow. 



(5) Only the fourth, fifth, and sixth segments of the abdomen have spines 

 at the postero-lateral corners. In Bigelow's specimen, the second and third 

 segments also had these spines. 



There are eight carinas on the dorsal surface of the telson (PI. 27. fi°'. 3), 

 in addition to the median one. In the nomenclature used by Kemp, these 

 carina? are the submedian, intermediate, second lateral, and marginal the 

 first laterals being absent. If my identification of this specimen is correct, 

 it supports Kemp's suggestion that the carina* next the marginals in this 

 species are homologous with the second laterals of his nomenclature. In the 



