Mr. E. J. Miers on Malaysian Crustacea. 463 



The length of a full-sized specimen is about 1 i inch, of one of 

 the smallest (with brood-pouch) about f inch. There are one 

 or two specimens in which neither brood-pouch nor external 

 male organs exist (length of the largest f inch) . 



Anilocra alloceraia. 



p Aniiocra leptosoma, Bleeker, t. c. p. 30, pi. i. fig. 6 (1857). 

 Anilocra allocercea, Kolbol, Sitz. Ak. Wien, lxxviii. p. 407, pi. ii. fig. 1 

 (1879). 



Four specimens, females, are in the collection. In one only 

 of these are the antennae and uropoda in a perfect condition. 

 The first pair of antennas agree exactly in the form of their 

 fourth and fifth joints with Kolbel's excellent description 

 and figure. In every other respect they so closely resemble the 

 Anilocra leptosoma of Bleeker, that I at first assigned them 

 without hesitation to that species ; and I am even now inclined 

 to regard it as probable that Bleeker's remarks and figure of 

 the antennas may be inaccurate, and the two forms really 

 referable to one and the same species ; and this I think the 

 more likely, as the two species inhabit the same geographical 

 region. Bleeker, it may be observed, notes that the uropoda 

 in A. leptosoma do not reach beyond the extremity of the 

 terminal postabdominal segment ; in his figure, however, they 

 are represented as distinctly longer than this segment, in this 

 particular agreeing both with Kolbel's description of A. 

 allocercea and with the specimen before me*. 



* I may take this opportunity of noting that the larger of the two 

 original examples of Ceratothoa trigonocephala (Cymothoa trigonocephala. 



Leach, and the one which bears his MS. label and must be consi- 

 dered as the type) differs from C. trigonocephala as figured by Kolbel 

 (pi. i. fig. 3), and resembles C. oxyrhyncliccna of that author, in the 

 form of the head (which has the lateral margins straight and the front 

 acute) and in the form of the anterolateral processes of the first segment 

 of the body, which in a lateral view are rather broad, and in a dorsal 

 view appear narrowed at their apices. It differs from C. oxyrhyncheena. 

 however, in the form of the penultimate postabdominal segment, which 

 has the posterior margin sinuated in the middle and on each side, and 

 therein, agrees with Kolbel's description of the specimens he refers to 

 trigonocephala. Length 1| inch. 



The smaller example (length 10A lines) agrees more nearly with 

 Kolbel's figure of C. trigonocephala in having the lateral margins of the 

 head slightly sinuated and the front less acute; the apices of the antero- 

 lateral processes of the first segment of the body, however, are narrowed 

 both in a lateral and dorsal view ; the form of the penultimate postabdo- 

 minal segment sinuated, as in the larger example. As the exact localities 

 of these examples are not known, it is difficult to determine whether the 

 two belong to distinct species, or whether the differences indicated by 

 Kolbel are not perhaps rather to be regarded as of less than specific 

 value. The basis joint of the seventh pair of legs is, in both specimens, 

 much less dilated posteriorly than in C. o.ryrhynehana. 



