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Dimensions in mm. : 



Distance between external orbital angles . 



Length of carapace 



Total length of left cheliped 



Horizontal length of chela 



Height of palm 



Length of immobile finger 



Length of anterior pair of walking legs. . 

 Length of posterior pair of walking legs . 



X" i is a specimen measured by Koelbel, n° 2 is the "Siboga" specimen. 



2. Tympanomerus integer n. sp. PI. 3, Fig. 1, 

 Stat. 250. Kar Island, -west of Kei Islands. 1 (ƒ• 



The carapace is much convex in longitudinal direction, but much less so transversely , 

 it has a pentagonal shape, with the side margins converging backward, and is nearly wholly 

 smooth and polished. The regions are scarcely distinct, the gastric-hepatical and cardiac-branchial 

 sulci slightly indicated, but even the cervical groove, thotigh discernible halfway between the 

 level of the external orbital angles and the posterior margin of the carapace, is very faint. 

 Hepatical regions faintly bulging and, like the branchial regions, regularly sloping down laterally; 

 the latter areas are somewhat roughened. Intestinal region very short, but extending along the 

 whole posterior border of the carapace, and transversely striated ; a transverse ridge separating 

 this area from the cardiac region is scarcely indicated. 



The base of the perpendicularly-deflexed front measures less than one-fourth the distance 

 between the external-orbital angles-, the surface is flattened, not excavated; the lateral margins 

 converge forward and pass with obtuse angles into the perfectly straight anterior margin. The 

 supra-orbital border is much sloping, much convex in its middle part, and entire, not beaded ; 

 the external orbital angle projects very little, is small and acute and passes nearly' 

 rectangularly into the side margins, that in the anterior fourth part converge very little, than 

 more strongly so towards the base of the last legs, so that the somewhat concave posterior 

 margin of the carapace is much shorter than the distance between the external orbital angles. 

 These side margins are unarmed, without any tracé of an epibranchial tooth, and 

 there are a few feathered hairs projecting bevond the external orbital angle and inserted on 

 its ventral surface, but none of the club-shaped, sensory (or auditory?) hairs along the anterior 

 part of the side margins, as noted in the preceding species. 



' The abdomen of the c? (fig. 1 c) occupies at its base only half the distance between the bases 

 of the posterior legs. The third segment has convex lateral margins and is about twice as long 

 as the two preceding segments together-, the fourth segment narrows forward and the filth is, 

 as usual, much constricted, quadrangular, and less than half as broad as the fourth segment 

 at its base, but both segments are completely fused and I have not found the 

 slightest tracé of a suture between them ; the length of the two segments together is 1 >/., times 



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