§3 



tooth at their base. The ridge on the middle of the upper surface is little prominent, smooth 

 and does not seem to be formed by acute teeth, covering one another like tiles, as in Scyll. 

 Martensii\ the upper surface which is covered with a short tomentum, carries no tracé of 

 the ridge and granules that are observed in Scyll. Martensii. The inner border of the 

 5 th joint ends in an acute tooth. The terminal joint or flagellum resembles that of Scyll. Martensii; 

 the anterior margin is cut into five lobes or teeth, besides two small ones on the inner margin, 

 the posterior of which is rudimentary and which have the same form as in that species. 



The sternum (PI. II, fig. 12a) is less concave and less broad than that of Scyll. 

 Martensii (PI. III, fig. 13). In the larger female of Scyll. Martensii from Stat. 313, which has 

 the same size as the female of Scyll. bicuspidatus \ the sternum, measured in the middle line, 

 appears to be 6 mm. long and 5 mm. broacl between the coxae of the 5" 1 pair of legs : in the 

 female of Scyll. bicuspidatus it is 5 3 / i mm. long and 4 1 / i mm. broad. The slightly concave, 

 anterior border of the first sternal somite presents a small notch in the middle line and one 

 on each side of it, so that one observes on each side a rounded prominence. The i st sternal 

 somite is not hollowed out as in Scyll. Martensii, but flattened ; it is, however, grooved in 

 the middle and this furrow widens anteriorly. The lateral sides of the sternum are stee per 

 in Scyll. Martensii and their surface is more uneven than in Scyll. bicuspidatus ; in the 

 latter only the 5 th sternal joint carries a tubercle in the middle, the sternum is smooth, though 

 distinctly punctate on the sides, but there are no squamiform prominences. 



The i 5t pair of thoracic legs are of a stouter shape than those of Scyll. Martensii, 

 their joints being broader in proportion to their length ; the merus, for instance, is 2,5 mm. 

 long and 1,7 mm. broad proximally, in the larger female of Scyll. Martensii from Stat. 313 the 

 merus is just as long, but 1,55 mm. broad. Likewise the following legs are less si en der than 

 those of Scyll. Martensii. The propodi of the 2 nd pair (PI. IJ, fig. 12 b), that are subcylindrical, 

 though tapering towards the distal end, are 2,4 mm. long, measured in the middle of their outer 

 surface, 0,76 mm. broad at the proximal end of their upper margin and 0,52 mm. at the distal 

 extremity; the terminal joints are 1,9 mm. long and 0,42 mm. thick at their base. In the 

 larger female of Scyll. Martensii from Stat. 313 the propodus of the 2 nd legs is 2,3 mm. long, 

 0,74 mm. broad at the proximal and 0,52 mm. at the distal end; the dactylus is 2,65 mm. long 

 and 0,42 mm. thick at its base. While the propodi of these legs have the same form in both 

 species, the merus, the carpus and especially the dactylus appear distinctly stouter, less 

 slender than in Scyll. Martensii; the dactylus e.g. is shorter than the propodus, instead of 

 longer, and it appears less slender. The propodi of the 3 rd legs (PI. II, fig. 12 c) are 2,3 mm. long, 

 0,78 mm. broad a little beyond their proximal extremity and 0,54 mm. at their distal extremity; 

 the dactylus is 1,45 mm. long and 0,42 mm. broad at base. In the larger female of Scyll. 

 Martensii from Stat. 313 the propodi of these legs are 2,3 mm. long, 0,7 mm. broad a little 

 beyond their proximal extremity and 0,48 mm. at the distal one; the dactylus is 2,1 mm. long 

 and 0,38 mm. thick at its base. In Scyll. bicuspidatus these propodi are 3 1 / 3 -time.s as long as 

 their average width and one and a half as long as the terminal joints, in Scyll. Martensii 

 4-times as long as their average width and little longer than their dactyli. The propodi of the 

 3 rd legs are distinctly somewhat compressed; they present on their outer surface two 



