1908.] Records of the Indian Museum. 213 



gastric area ; they are wanting on the cleflexed, somewhat pubes- 

 cent, branchial regions and near the transverse, intestinal ridge. 

 On the lateral regions of the carapace these lines are situated on 

 transverse, pubescent ridges and prominences with crenulated 

 margins. The anterior margin of the front measures one-fourth 

 the distance between the outer orbital angles, and reaches in the 

 middle further forward than at its rounded lateral angles ; the 

 lateral margins of the front are first slightly directed inward and 

 then pass with a regular curve into the sinuous, transverse, upper 

 margin of the orbits. The upper surface of the front is broadly 

 and rather deeply grooved in the middle, whereas the lateral parts 

 carry five or six oblique, impressed lines at either side. 



The orbits are transverse as in Tymp. orientalis and almost 

 once and a half as broad as the front. The antero-lateral portion 

 of the lateral borders of the carapace, formed by the extraorbital 

 and by the epibranchial tooth, slightly diverges, whereas the postero- 

 lateral portion slightly converges backward. The outer margin of 

 the extraorbital tooth is at a right angle with the upper orbital 

 margin, so that the extraorbital tooth is not very sharp and moder- 

 ately prominent. The epibranchial tooth, hardly discernible 

 when the carapace is looked at from above, appears, in a lateral 

 view of the latter (fig. ic), as a tooth larger than the extraorbital 

 one, from which it is separated by a deep, vertical notch, the an- 

 terior margin of the epibranchial tooth being at a right angle with 

 the outer margin of the other. Whereas the margins of the extra- 

 orbital and of the epibranchial tooth are rather sharp and con- 

 tinuous, the postero-lateral margins are often interrupted and 

 appear therefore ill defined; the oblique, ciliated line on the sides of 

 the carapace is directed towards the posterior end of the epibran- 

 chial tooth. In Tymp. pusillus the postero-lateral margin is well 

 defined and the epibranchial tooth is obtuse, but quite visible from 

 above, as it projects laterally beyond the small extraorbital tooth ; 

 this is also the case in Tymp. orientalis, but the divergent, antero- 

 lateral margin is here much longer, and the oblique, ciliated line 

 runs to the middle of the lateral border of the carapace (compare 

 de Man, Zoolog. Jahrb. (Spengel), iv, 1889, p. 448). 



Bye peduncles stout, smooth, transverse ; eyes terminal. An- 

 tennules folding obliquelj^ I^obe or tooth on the posterior margin 

 of the epistome triangular, acute, very prominent. Lower margin 

 of the orbits finely serrated, running nearly as in Tymp. pusillus, 

 but less prominent ; no tooth therefore at the outer angle, as is 

 observed in Tymp. orientalis. Pterygostomian region finely granu- 

 lated and ciliated, as in Tymp. pusillus, but the lower, oblique 

 groove that runs from the antero-external angle of the buccal 

 frame obliquely backward, is very shallow and situated nearer to 

 the lower orbital margin than to the lateral margin of the buccal 

 frame, whereas in Tymp. pusillus it runs farther distant from the 

 orbital margin than from the buccal frame. 



Posterior margin of the buccal frame (fig. 16) once and a half 

 as broad as the distance between its antero-external angles, and 



