526 RET. T. B. R. STBBBING ON CBUSTA.CBANS [May 22, 



second joint of the exopod traversed by a mnscle evidently adapted 

 for moving the terminal fascicle of long set;B, about six in number. 



From the chelipeds specific distinctions can scarcely be derived, 

 since in well-developed males of H. planatas there appear to be 

 greater diiierences than any which can be pointed out between the 

 chelipeds of that species and those of H. ovatus. Nicole t's Liriopea 

 Iticasii from Chilo is founded almost exclusively on the robust 

 character of the chelipeds, " ending in a hand almost globose, much 

 iuflated and of dingy blackish colour," the movable finger having a 

 strong dentiform tubercle near the proximal end of the inner 

 margin. These, however, are characters which may be rather 

 indicative of age than species. 



The four following pairs of trunk-legs (or peraeopods) are natu- 

 rally stouter in H. planatus, that being much the larger species ; 

 but in the flattened terminal joint or finger there is also some 

 difference of shape and armature, this joint in H. planatas being 

 bx'oader in comparison with its length, less curved, with the teeth 

 of the inner margin not reverted, and implanted some on one side 

 and some on the other of the border, whereas in H. ovatus they are 

 in single tile and provide the joint with a slightly backward directed 

 serrature. In both species the two teeth nearest the acute nail 

 are the largest, and the spaces between the spines have finely 

 serrate setae, of which there is a group at the base of the margin. 



The broad, rounded pleon of the female and the terminally 

 narrowed pleon of the male exhibit no characters for distinguishing 

 the two species. 



Breadth of H.planatus about 9 mm., length a little less ; breadth 

 of H. ovatus scarcely. 7 mm., length a little Jess than the breadth. 



Mr. Vallentin reports H. planatus as " common under stones and 

 kelp, Stanley Harbour." 



X Y B B H Y N C H A. 



Fam. Inachid.^. 



1886. /naci^t(Zop,Mier3,' Challenger' Brachyura, Reports, vol. xvii. 

 pp. X, 2. 



Dana in 1852 (U.S. Expl. Exp., Crnst. p. 77) in the Maiinea 

 distinguished a family Eurypodidse, as having eyes retractile to the 

 sides of the carapace, but without concealment below it. To this 

 he referred three genera, Ewypodius, Oregonia, and Amathia. 

 Miers in 1886 refers the family to Stimpson, who adopted it in 

 1870 with an acceptation regarded by Miers as equivalent to his 

 own subfamily Inachinae (see J. Linn. Soc. Lond., vol. xv. p. 644, 

 and ' Challenger ' Report, p. 11). Alcock in 1895 divides the sub- 

 family Inachinae into two alliances, Leptopodioida and Inachoida, 

 to the latter of which Earypodius is assigned with a scoi'e of other 

 genera (J. Asiat. Soc. Bengal, vol. Ixiv. pt. 2, p. 164). If the 

 genus Leptopodia has to relinquish its name, as Miss Rathbun 

 argues that it ought to do, the alliance Leptopodioida would natu- 

 rally, in conformity with her view, be called Macropodioida. 

 [10] 



