404 A HISTORY OF EECENT 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 Liriope 

 (Rathke), but without antennas ; the female much larger, 

 its segmentation continuing in the mature state.' (' ZooL 

 Record,' 1873). 



Eumetor liriopides, Kossmann, 1872, in the mantle- 

 cavity of Sacculina pisiform/is, from the Philippines. Dr. 

 Fraisse, discussing specimens which he supposes to belong 

 to this genus, from the mantle of Sacculina Benedenii, 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 seta3 on the inner antennae.' 



Cryptothir, Dana, 1852, on non-parasitic Cirripedes. 



Oryptothir minutum, Dana, in the corallidomous barnacle 

 Creusia, at the Fiji Islands. 



Gryptothir balani (Bate), 1861, on Balanus balanoides. 

 The larval form, as taken with the tow-net in the Clyde, 

 has eight teeth on the basal joint of the first antennas ; the 

 second antennas nine-jointed ; the mouth-organs forming 

 a triangular mass, with the apex pointing backwards ; the 

 sides of the perason, and in a 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 r 

 the branches tipped with setae. 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 Oryptothir. But according to Buchholz the 

 adult female of his Hemioniscus balani 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 Scrolls cornuta, Studer, on the dor- 

 sal surface of some of the anterior segments, and ' apparently 

 belonging to the genus Hemioniscits,' but this parasite has 

 not been described. 



