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



from the River Onon, in Dauria, South-eastern Siberia, 

 but may be distinguished by the form of the coxre, which 

 in L. Renardi extend along the whole length of the lateral 

 margins of the segments of the body to which they are respec- 

 tively attached. Of L. Renardi there is in the Museum col- 

 lection a female taken from a species of Mugil inhabiting the 

 Indian seas {Dr. F. Bay, F.L.S.). 



L. daurica is very closely allied to L. JeUinghausii [Ichthy- 

 oxenus JeUinghausii , Herklots, Arch. Ne"erlandaises, v. p. 128, 

 pi. v. fig. 10-18) from the fresh waters of Java, with which I 

 should be inclined to unite it, were it not for the widely 

 separated localities of the two species, as it apparently differs 

 in nothing but the somewhat shorter uropoda of the penul- 

 timate segment. 



I have no information as to whether L. daurica penetrates 

 the body of its host behind the ventral fins, as does L. JeUing- 

 hausii. Except for its peculiar habitat, I can see nothing 

 to distinguish Ichthyoxenus from Lironeca; but because 

 Herklots had described the Javan species as a distinct genus 

 I did not suspect its affinity with the Daurian form when I 

 described the latter. 



It does not appear that a generic character can be found in 

 the position of the coxae, i. e. their insertion in the angles 

 between the thoracic segments, since Herklots notes a varia- 

 tion of this character in specimens he considers to be males 

 of L. JeUinghausii*. 



Lironeca Boscit, Bleeker. 



A considerable series is in the collection. The largest 

 example (length about 10 lines) exhibits the characters of the 

 male sex, and is the only one in which they are distinctly 

 observable. The greater number are well-developed females, 

 the largest being about 9 lines long (f inch). 



Lironeca ornata, Heller, from Sambelong, is a nearly allied 

 form, but is distinguished by the triangular terminal segment, 

 which is produced greatly beyond the extremity of the rami 

 of the uropoda. 



* Closely allied species are in the Museum collection from the Mauri- 

 tius (R. Templeton, Esq.), designated, but not described, by White as 

 Cymothoa micronyx, and from Australia (Earl of Derby and J. B. Jukes, 

 Esq.), as Cymothoa contracta. Lironeca contractu is apparently distin- 

 guishable by the much broader, more dilated basis joints of the four 

 posterior thoracic limbs and subacute rostrum, Lironeca micronyx by the 

 transverse terminal segment and the less marked carina of the posterior 

 thoracic limbs ; the specimens of the latter species, however, are much 

 shrivelled from having been preserved in a diy state. In all of the above 

 the coxae are inserted in the angles between the thoracic segments. 



