Vol. LX, Nos. 8-9.] Biological Work of the ‘‘ Investigator.’’? 345 
[N.S.] 
even less violent in those cases where no female was to be seen 
in the vicinity : there was no trace of the excitement described 
by Alcock (1901, p. 67). Pearse (1912, p. 113) has recently 
given a very good account of the habits of the fiddler-crabs in 
the Philippines, and so far as they go, my observations agree 
with his description. 
The colouration of Gelasimus tetragonum (Herbst.) is peculi- 
arly striking: the carapace in front is yellow, turning to a pale 
green in the centre and posteriorly to a bright blue, with a 
very distinct pattern outlined in rows of black dots. 
entrally the abdomen was of a purple-blue tinge while 
the ischium and merus of the external maxilliped was a bright 
blue. The legs were orange in colour turning to a brown on the 
carpus and dactyl. 
The large chela in the male was pale yellow with a splash 
of orange at the base of the fixed digit. In the female the chelae 
were splashed with blue on the hands and the carpus of the 
ambulatory legs was orange, not brown as in the male 
In addition to the above, the following species were 
obtained :— 
Decapoda, Reptantia. 
Charybdis (Goniosoma) merguiensis, de Man. 
Clibanarius padavensis, de Man. 
Epixanthus frontalis (Edw.), Heller. 
Leptodius exaratus, Edw. 
Macrophthalmus errato, de Man. 
Macrophthalmus verreauaxti, Edw. 
Neptunus sanguinolentus (Herbat). juv. 
Pilumnus vespertilio, Fabr. 
Sesarma quadratum (Fabr.) 
Thalamita crenata (Latr.), Edw. 
Several examples of the following species proved to be 
ovigerous females, viz. Gelasimustetragonum, Lepiodius exaratus, 
Metapograpsus messor, and Pilumnus vespertilio. 
As regards the examples of Leptodius, these were all, even 
the ovigerous females, quite small, measuring only 5-6 mm. in 
the breadth of the carapace: several specimens were found to 
be infected with a species of Sacculina and it is possible that the 
small size of the examples was the result of parasitization. 
Decapoda, Natantia. 
Peneus indicus, Edw. juv. 
Numerous, examples of Peneids and Alpheids were 
obtained from the rock-pools; also examples of species of 
Callianidea and Gebia. : 
Stomatopoda.—A single specimen of Gonodaciylus chiragra, 
1 
Fabr. was captured in a rock-pool. 
