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



Oonodactylus trispinosus } White. 



Amboina (an adult female). 



This example agrees in all particulars with the two in the 

 Museum collection from Sharks' Bay, W. Australia, which 

 differ somewhat from the type (from Swan River) in the 

 larger tubercles of the terminal segment, and the more nume- 

 rous and regular denticulations of its posterior margin. The 

 terminal segment is scantily clothed with short hairs. 



ISOPODA. 



The Isopoda in Dr. Bleeker's collection were nearly all 

 contained in a single bottle, without any special indication of 

 locality. Upon examination, however, this bottle was found 

 to contain fourteen out of the sixteen species described by 

 him in his memoir on the Malaysian Cymothoidae, already 

 referred to*. 



Two or three other species, which are not included in that 

 paper, were also found in the collection, and are described or 

 referred to below. 



In several of the species, and particularly in the large series 

 of specimens of Gymothoa Leschenaultiij can be traced the 

 gradual modification of the external sexual organs, accom- 

 panying the transformation of the young male individual into 

 the fully-grown and perfectly-developed female, as detailed 

 by Bullarf and Dr. P. Mayer J, in their recent important 

 researches demonstrating the existence of hermaphroditism 

 and illustrating the various stages of development in the para- 

 sitic Cymothoidae. Further details are given below, under 

 the heads of the different species. 



Oniscidea. 



Ligia Gaudichaudii. 



? Liqia Gaudichaudii, M.-Edw. Hist. Nat. Crust, iii. p. 157 (1840) ; 

 ?Gay, Hist. Chile, iii. p. 265 (1849) ; PDana, Cr. U.S. Expl. xiv. 

 p. 741, pi. xlix. fig. 6 (1853). 



A considerable number of specimens without definite locality 

 are in the collection, which agree very well with the descrip- 

 tion and figure of Dana. Unfortunately in all of these the 

 antennae are imperfect and the uropoda are wanting. An 



* "Sur les Isopodes Cymothoadiens de l'arcliipel Indien," in Acta 

 Societatis Scient. Indo-Neerlandicse, ii. (1857). 

 t Journ. Anat. Physiol, xi. p. 118 (1876). 

 t Mittheil. Zoolog." Stat. Neapel, i. (Heft 2) p. 165 (1879). 



