i82 J. G. DE Man : Sesarma thelxinoe. [VOL. II, 



finely granulated ; that of the inner lobes is straight and transverse 

 in the male and in the younger female (fig. 2), but in the other 

 female the free edge of these lobes is slightly concave and runs a 

 little obHquely (fig. 4). The outer post-frontal lobes reach a little 

 further forward than the inner. The front (fig. 3), which is 

 somewhat concave, is four times as broad as high ; in the male, in 

 which the upper margin is 6*8 mm. broad, the front is 17 mm. 

 high at either side of the middle. The lateral margins of the 

 front are nearly parallel, being only very slightly convergent ; the 

 lower margin is but very faintly sinuous, the median emargination 

 is broad, but very shallow, and the lateral ones are hardly recognis- 

 able. Viewed from before, the lower margin appears straight in the 

 middle ; on each side of the middle it appears, in the male, very 

 slightly concave, but in the two females distinctly so. The front 

 is covered, especially laterally, with microscopical granules, but 

 the anterior surface of the inner post-frontal lobes is almost smooth ; 

 lying on each side contiguous to the lower margin are two or three 

 somewhat larger granules. 



As in other species, a transverse ridge is situated a little be- 

 hind the free margin of the outer post-frontal lobes ; between this 

 margin and the ridge, which is very finely granulate and presents 

 a somewhat oblique direction, the upper surface of the outer 

 frontal lobes is covered with some small granules, that anteriorly 

 are partly arranged in transverse rows. Some small granules are 

 also observed on the anterior half of the hepatic region and near 

 the antero-lateral margins of the carapace, as also two short, finely 

 granulated ridges, the anterior, shorter one on the extraorbital 

 tooth, the other near the middle of the first epibranchial tooth. 

 The deflexed, branchial regions are marked with the usual oblique 

 striae. All the rest of the upper surface of the carapace is perfectly 

 smooth, without any trace of granules, even when examined through 

 a magnifying glass ; the inner -post-frontal lobes arc thus also quite 

 smooth above as far as their anterior margin. The upper surface is, 

 however, punctate, finely on the gastric region, more coarsely on 

 the branchial regions and on the depressions that separate the latter 

 from the area intestinalis ; in a few puncta short, stiff setae are 

 inserted. As in 5. sylvicola, the lateral margins of the carapace 

 distinctly diverge backward and are very faintly concave behind 

 the middle. 



Extraorbital tooth acute, its outer margin slightly convex, 

 sometimes straight or even faintly concave ; by a rather deep, 

 triangular notch this tooth is separated from the first epibranchial, 

 which is also acute and, like the extraorbital tooth, somewhat 

 turned upward ; the outer margin of this tooth, which is once- 

 and-a-half as long as the extraorbital tooth, is straight and al- 

 ready divergent. A trace of a very small second epibranchial 

 tooth is indicated. The posterior margin of the carapace is just as 

 broad as the front. 



The abdomen of the male (fig. 5) resembles that of 5. sylvicola 

 (de Man, Abhandl. Scnckenberg. Naturf. Gesellschaft, xxv, 1902, 



