Vol. IX, Nos. 8-9.] Biological Work of the ‘‘ Investigator.’’ 339 
[NV .S.] 
attribute to the assumption of a special breeding colouration 
(Southwell and Sewell, 1913, p. 10). 
Tunicata.—On several occasions groups of Ascidians were 
washed ashore by the tide; each group consisted of six to eight 
individuals arranged side by side. The mouth and anal apertures 
12” in length and was covered by a separate test, which was 
impregnated with particles of sand and was of a delicate 
purple-blue colour. 
CrustacEa.—As usual thesandy beach was swarming with 
cordimana Desm, and, as in Hinzé Basin, these species showed 
the same peculiarities in both colouration and burrowing. The 
rock reefs were frequented by numerous Grapsoid crabs Grapsus 
strigosus Herbst and Meiapograpsus messor (Forskal) A. M. Edw. 
Other species of crabs obtained in this locality are as follows :— 
Dotilla myctiroides, Edw. 
Epixanthus frontalis (Edw.) Heller. 
Gelasimus annulipes, Latr.; Edw. 
Thalamita crenata (Fabr.) Edw. 
Thalamita danaé Stimpson. 
Thalamita prymna (Herbst.) 
Two of the above species had apparently made their 
appearance in this locality during the interval between my two 
visits. The first example was the Gelasimus annulipes: no 
Edw. 
Sromatoropa.—Several specimens of Gonodactylus chiragra, 
