CRUSTACEA OF THE MERGUI ARCHIPELAGO. 199 
it seems extremely probable to me that P. pubescens, Miers, 
from Western Australia, is identical with this species. Miers 
describes the thoracic sinus of P. pubescens as having “its 
anterior margin smooth, not beaded and not defined at either 
extremity, and having its cavity above the base of the anterior 
legs filled with a short close pubescence,” a description which 
is applicable to Pseudophilyra Hedtit. 
Leucosia vittata, Stimps., from Hong Kong, and Leucosia 
rhomboidalis, de Haan, are also closely allied forms. A thorough 
revision of the Leucosiide, based on a study of all the described 
type specimens in Museums, is much needed. 
The young Mergui specimen is 9} mm. long and 8 mm. broad. 
110. PsevpoPHILYRa MELIra%, n. sp. 
Two male specimens were collected. This species is most 
closely allied to Pseudophilyra orbicularis, Bell= Leucosia orbi- 
cularis, Bell (Bell, Hore Carcinologice, Trans. Linn. Soe. vol. 
Xx1. 1855, p. 284, tab. xxx. fig. 1), in which the cephalothorax 
1s almost orbicular in form, and the front does not extend 
as far forwards as the anterior margin of the buccal cavity. 
This species differs from the foregoing in the front being 
tridentate, in the palms of the hands being granulated on their 
inner (anterior or lower) margins, and in the shape of the male 
abdomen. 
Both species closely resemble one another in their outer 
appearance, not only in their carapaces, which are scarcely longer 
than broad, but also in their legs, which are slender. The broad 
front does not extend as far forwards as the anterior margin of 
the buccal cavity; it is tridentate, the frontal margin having a 
small acute triangular tooth in the middle, but not projecting 
beyond the anterior margin of the buccal cavity, whereas the 
lateral angles are rather obtuse, the front being a little concave 
between them. The eyes are small. ‘The upper surface is a 
little convex; each hepatic region rises into a small rounded 
tubercle, and these regions are thus separated from the front 
by a concavity. 
Although the upper surface appears smooth and shining to 
the naked eye, with the aid of a lens it is seen to be covered on 
the middle of the cardiac, intestinal, and branchial regions 
with a few sparsely scattered, very small granules; anteriorly 
* Melita, one of the Nereids. 
