4.04, A HISTORY OF RECENT CRUSTACEA 
curvatus, Kossmann, is said to have a cylindrical form, and 
to be nearly related to the preceding species. 
Eumetor, Kossmann, 1872. ‘The male allied to Lnriope 
(Rathke), but without antenne ; the female much larger, 
its segmentation continuing in the mature state.’ (‘ Zool. 
Record,’ 18753). 
Eumetor liriopides, Kossmann, 1872, in the mantle- 
cavity of Sacculina pisiformis, from the Philippines. Dr. 
Fraisse, discussing specimens which he supposes to belong 
to this genus, from the mantle of Sacculina Denedeniw, says 
that no brood-cavity is present, the Isopod being content 
to use the mantle of the Sacculina for that purpose. He 
also says that the male of Kossmann’s species ‘has no 
olfactory setee on the inner antenne.’ 
Cryptothir, Dana, 1852, on non-parasitic Cirripedes. 
Cryptothir minutwm, Dana, in the corallidomous barnacle 
Creusia, at the Fiji Islands. 
Cryptothir balani (Bate), 1861, on Balanus balanovdes. 
The larval form, as taken with the tow-net in the Clyde, 
has eight teeth on the basal joint of the first antennz ; the 
second antenne nine-jointed; the mouth-organs forming 
a triangular mass, with the apex pointing backwards ; the 
sides of the perzeon, and ina less degree those of the pleon, 
digitate; the first two pairs of trunk-limbs not degraded, 
strongly subchelate, the next three pairs slightly so, the 
last two pairs simple, with the two terminal joints elongate ; 
the five pairs of pleopods and the uropods two-branched, 
the branches tipped with sete. According to Bate and 
Westwood, the adult sedentary female is a lobate sack- 
formed mass without any appendages. 
The genus Hemioniscus, Buchholz, 1866, is said to be 
a synonym of Cryptothir. But according to Buchholz the 
adult female of his Hemioniscus bulant retains the front 
part of the larval form. This, however, may not be per- 
manently the case. Beddard mentions a Bopyrid in the 
larval stage attached to Serolis cornuta, Studer, on the dor- 
sal surface of some of the anterior segments, and ‘apparently 
belonging to the genus Hemioniscus,’ but this parasite has 
not been described. 
