Mr. E. J. Miers on Ocypoda. 383 
normal and due to the age and large size of the specimen, or 
characteristic of a well-marked local variety. More specimens 
are needed to decide this point with certainty. 
6. Ocypoda platytarsis, Milne-Edwards. 
(Pl. XVII. figs. 5, 5 a.) 
This species is nearly allied to O. ceratophthalma, but is 
distinguished by the relatively broader carapace, with more 
strongly sinuated upper orbital margin, the exterior angle of 
which is not acute, by the form of the stridulating-ridge on 
the inner surface of the large chela, which consists in both 
sexes of a series of small tubercles which do not widen out 
into striz and are not bordered by hair, and by the absence 
of hair from the under surfaces of the penultimate joints of the 
ambulatory legs in both sexes. The dactyli of the ambulatory 
legs are somewhat dilated in the adult. 
There is in the British-Museum collection an adult male from 
Madras and a small male without special locality (coll. Hast- 
India Museum), also an adult female without special locality 
(Gen. Hardwicke), a smaller male from the collection of the 
Hon. East-India Company, and a fine adult male and smaller 
mutilated example from Ceylon (Dr. J. Davy). 
In some young specimens from Ceylon (Z. W. H. Holds- 
worth) the ocular styles are small or rudimentary, or even 
(in the smallest examples) wholly deficient; and in these 
specimens the carapace is relatively narrower and the dactyli 
of the ambulatory legs slender and styliform, so that were it 
not for the existence of large specimens in the same phial the 
species could not be certainly identified. 
7. Ocypoda Gaudichaudii, Milne-Edwards & Lucas. 
(Pl. XVII. figs. 6, 6 a.) 
Of this species, which is at once distinguishable by the 
broad and squarely-truncate fingers both of the right and 
left chelipedes, there are in the British-Museum collection 
two males and a female from Panama (Bridges and Smith- 
sonian Inst.), and a female from Esmeralda, Ecuador (Fraser) ; 
also an adult male from Chile (Lev. Dr. Hennah). 
The antero-lateral angles of the carapace in these specimens 
are slightly acute and project laterally ; the ocular styles 
are prolonged but little beyond them; and the stridulating- 
ridge of the larger chela, alike in males and females, is 
narrow, consisting in its upper part of a row of granules or 
small tubercles, which widen out into close-set striz in the 
lower portion. The ambulatory legs are granulated and 
rugose, but almost entirely destitute of hair. 
