igiQ-] S. Kemp: Notes on Crustacea Decapoda. 313 



two almost meeting between the bases of the eyestalks. The 

 central portion is depressed and smooth with a low longitudinal 

 ridge or elevation. 



The orbits have a strong dorsal indination, the greater part 

 of the cavity being visible in dorsal view. The upper border is 

 sinuous and slopes obliquely backwards; it has a smooth raised 

 rim and terminates in a blunt extra- orl)ital tooth. The lower 

 border is sharply denticulate and strongly curved. On the floor 

 of the orbit there is a fine beaded ridge which runs outwards from 

 the base of the eyestalks and meets the lower border in the outer 

 third of its length. 



The lateral margin of the carapace is defined as a sharp crest 

 extending from the orbital tooth to the base of the last legs ; it is 

 finely crenulate throughout and fringed with short setae. 'Both 

 above and below the crest there is a smooth longitudinal groove. 

 The side-walls of the carapace are finely granular and setose. 



The endostomial margin almost touches the basal segments of 

 the antennules and antennae, the epistome consisting merely of a 

 median triangular plate bearing a sharp transverse carina. The 

 expanded penultimate segment of the second maxilliped (text-fig. 

 I a, p. 308) is not covered with long hairs as in 5. pilula. 



The third maxillipeds bulge strongly. The ischium is longer 

 than the merus and its breadth is a little greater than its length. 

 The merus is nearly twice as broad as long and the suture between 

 it and the ischium is decidedly oblique. The ischium is smooth 

 except for some obscure granules postero-externally and for a 

 raised line fringed with setae near the antero-lateral angle. There 

 is a deep groove on the merus near its lateral border and on the 

 inner side of the groove some low granules. A short blunt ridge 

 runs to the articulation of the carpus. Antero-internally the 

 surface of the merus is smooth and concave, with the margin 

 reflected upwards. 



The chelipeds of the male, if straightened, would be rather 

 more than twice the length of the carapace. The merus has a 

 tympanum on its outer side, in breadth about half that of the seg- 

 ment, and another, larger and less well defined on its inner surface ; 

 except for the tympana the segment is closely granular. The carpus 

 is also granular and its upper surface is less than twice as long as 

 broad in males. The three edges of the merus and the inner and 

 outer edges of the carpus are rounded, not crested as in S. pilula. 

 The chela is a little longer than the carapace and is nearly three 

 times as long as high; its height near the carpal articulation is 

 fully three quarters its greatest height. Both upper and lower 

 borders of the palm are rounded and the entire surface, both within 

 and without, is closely covered with squamiform granulation. The 

 fingers are longer than the upper border of the palm, but shorter 

 than Its total length ; each is glabrous with four longitudinal, finely 

 serrate carinae. Except near the tip the prehensile edges of the 

 fingers bear small teeth, a group on the dactylus a little behind 

 Its middle pomt being rather larger than the others. 



