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 gerandert." 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. 
Tympanomcrus dcschampsi, Rathbun. 
1914. Tympanomerus deschampsi, Rathbun, Proc. U. S. Nat. Mus., XL VI, p. 356, pi. xxxii, 
pi. xxxiii, fig. I. 
