228 



ZOOLOGY OF THE FAR EAST. 



great difference between large and small specimens in the form of the fingers of the 

 chela, the largest examples possessing merely a low crest in the middle of the dac- 

 tylus. 



De Man compares this species with D. sulcata and remarks (p. 311) " Das ster- 

 num ist iiberall glatt und zeigt nicht die fiir D. fenestrata characteristischen, durch- 

 sichtigen stellen ; wahrend aber die einzelnen segmenten bei D. sulcata leicht convex 

 erscheinen, sind sie bei der neuen Art stark abgeflacht oder leicht concav, sowie deut- 

 lich gerândert." On comparing the species with D. myctiroides it is, however, evident 

 that the slightly concave areas that occur on each sternal segment and occupy nearly 

 the whole of the space between the legs and the abdomen are true ' tympana ' and 

 that so far as the sternum is concerned the difference between D. wichmanni and 

 Hilgendorf's D. fenestrata rests merely in the number of segments on which 

 ' tympana ' are found. 



Fig. I. 



-Dottila wichmanni, de Man. 

 Adult male. 



Dr. Annandale notes that the ' runs ' made by this species are not so carefully 

 constructed and the pellets of sand not so tidily arranged as is the case with the 

 species found living on the western side of the Bay of Bengal. 



Dotilla wichmanni has not hitherto been recorded from Indian waters, but has, 

 however, recently been obtained in the Andaman Is. The specimens, none of which 

 are of large size, were found living on the sandy shores of Corbyn's Cove South, not far 

 from Port Blair. The species has been reported from Celebes, Makassar and Atjeh in 

 Sumatra (de Man), the Talaut Is. (Tesch) and from the coast of Koh Kong in the Gulf 

 of Siam (Rathbun) . 



Genus Tympanomerus, Rathbun. 



Tympanomerus deschampsi, Rathbun. 



1914. Tympanomerus deschampsi, Rathbun, Proc. U. S. Nat. Mus., XL, VI, p. 356, pi. xxxii, 

 pi. xxxiii, fig. I. 



