Mr. E. J. Miers on Malaysian Crustacea. 461 



example belonging to the same species is in the British- 

 Museum collection from Madgica Sima. 



Whether this be the L. Gaudichaudii of Milne-Edwards 

 must remain somewhat uncertain, on account of the brevity 

 of his description ; the habitat of his types was probably 

 Chilian. 



Cymotboidea. 



Cymothoa Leschenaultii. 



Cymothoa Leschenaultii, Leach, Diet. Sci. Nat. xii. p. 352 (1818). 

 Cymothoa Stromatei, Bleeker, Acta Soc. Sci. Indo-Neerland. ii. p. 35, 



pi. ii. fig. 13 (1857), ad. $. 

 Cymothoa Ethvardsii, Bleeker, t. c. p. 34, pi. ii. fig. 12 (1857), jun. S • 



This species would appear to be one of the commonest of 

 the Malaysian Cymothoidea, if one may judge from the very 

 large series in the collection. I have observed a considerable 

 variation in the form of the anterolateral lobes of the first seg- 

 ment of the body and of the basis joint of the last pair of legs, 

 and can see no sufficient reason for regarding Bleeker' s species 

 as distinct from the Cymothoa Leschenaultii oi Leach, of which, 

 unfortunately, only a single specimen from Pondicherry is in 

 the collection. Adult and full-sized examples of this species 

 are nearly 1^ inch in length; and amongst these are many 

 in which the brood-pouch is fully developed ; but there are 

 not a few others, scarcely inferior in size, in which no trace of 

 it exists. Two or three specimens are in the collection 

 (length of the largest 1^ inch), exhibiting that interesting- 

 transitional stage in the development of the animal, recently 

 described by Prof. Schiodte (see Ann. & Mag. Nat. Hist, 

 ser. 5, ii. p. 196), during which copulation takes place, and 

 in which the ovigerous pouch is developed upon the three 

 posterior segments of the body only. The largest of the 

 specimens, in which the external genital organs of the male 

 are developed upon the ventral surface of the seventh thoracic 

 segment, measures a little over 1 inch in length ; but the 

 majority are much smaller, some not exceeding half an inch. 

 These agree in all essential characters with C. Edivardsii as de- 

 scribed by Bleeker, which, therefore, I doubt not, was founded 

 on the younger male form of the species. The adult female 

 form of the species is apparently not invariably to be distin- 

 guished by its greater size ; for there is in the series one 

 example which does not seem specifically distinct, although 

 of somewhat abnormal growth, which bears ova in the per- 

 fectly formed brood-pouch, yet measures only f inch in 

 length. 



