's RIJKS MUSEUM VAN NATUURLIJKE HISTORIE — LEIDEN. 151 
Specimens in the Museum: 
3 d', 2 9, locality unknown (SG examined by de Man 1880). 
Fig. 3. Sesarma eydouai H. M. Edw. Nat. size. 
The carapace of this species is rather little convex in a longitudinal 
direction, and nearly straight transversely, with feebly sloping branchial 
regions; the greatest breadth is lying between the external orbital angles, 
which are acute and directed forward, with nearly parallel side margins. 
Behind these angles there is a trace of an epibranchial tooth, as de 
Man (1880) observes, whence the side margins converge very slightly 
backward (de Man 1892). The whole surface of the carapace is rugose, 
owing to a multitude of small tubercles, each of which seems to bear a 
small tuft of hair; this character is distinctly seen on the anterior third 
of the carapace, but farther behind, already on the mesogastric, and 
especially on the cardiac region, the tubercles gradually tend to become 
elongated transversely and are destitute of hairs, the posterior cardiac 
region being almost smooth and shining, though minutely pitted. All 
the usual furrows on the carapace are strongly pronounced, notably 
those circumscribing the mesogastric and protogastric regions. The post- 
frontal lobes are of nearly equal size, the median ones being but slightly 
broader than the lateral lobes, the median sulcus is very deep, that 
between the middle and the side lobes much shallower, extending till 
the distinct posterior lobe on the lateral ones. In dorsal view the front is 
not visible, as it is perpendicularly bent downward; the lateral margins 
are parallel and there is a deep and broad median sinus in the anterior 
margin. The eyes reach exactly to the tip of the outer orbital angle. 
11 
(16—VI—1917). 
