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



Cymothoa irregularis, Bleeker. 



Of this species (which, according to Dr. Bleeker, is common 

 on fishes in the seas of Amboina) a good series is in the col- 

 lection, including several specimens in which the brood-pouch 

 is well developed (length of the largest 1 inch) , and others in 

 which it does not exist ; but in these examples no external 

 male organs are observable ; the largest is about 8 lines. 

 Even in the smallest the characteristic lunate form of the first 

 thoracic segment is very apparent. 



There is a specimen in the Museum collection, apparently 

 referable to the Cymothoa rhinoceros of Bleeker, which cer- 

 tainly cannot remain in the genus Cymothoa ; but, on account 

 of its very mutilated condition, I cannot refer it with certainty 

 to any described genus. It has neither male nor female 

 external genital appendages. The head is transverse, eyes of 

 moderate size ; rostrum reflexed at tip, interantennal process 

 small, and not dividing the upper antennas at base, the first 

 joints of the upper antennas are not greatly dilated ; the lower 

 antennas broken, but evidently reaching beyond the posterior 

 margin of the first thoracic segment. The so-called epimerse 

 or coxal joints of the second to seventh legs are distinct. 

 The basis joints of the legs are not dilated, and the terminal 

 elaw small but strongly curved ; terminal segment triangular, 

 and uropoda with the inner ramus the larger and somewhat 

 obovate, outer slender, but not acute at apex. 



Anilocra marginata. 



Cymothoa marginata, Bleeker, Isopodes Cymotlioadiens, in Acta Soc. 

 Scient. Indo-Neerland. ii. p. 36, pi. ii. fig. 14 (1857). 



Two specimens are in the collection. According to Bleeker 

 it is found on fish in the seas of Batavia. This species must, 

 I think, be placed in the genus Anilocra, on account of the 

 linear form of the basis joints of the ambulatory legs. The 

 violet band on the posterior margin of the body-segments is 

 in these specimens (that have long been immersed in spirits) 

 of a brown hue. The larger example (length 11 lines) is a 

 fully-developed female; the smaller (length about 7 lines), 

 without brood-pouch, has yet some traces of the median pro- 

 minences of the seventh thoracic segment, characteristic of 

 the male. 



Anilocra dimidiata, Bleeker. 



A large number of specimens are in the collection, nearly 

 all of which arc fully-developed females. It lives, according 

 to Dr. Bleeker, on different fishes in the seas of Batavia. 



