oOO Mr. L. A. Bon-adaile on the 



especially broad in the forepart, and with the furrows be- 

 tween the regions almost completely lost, the ridges of the 

 efferent branchial channels well made, the sternal grooves of 

 the female ending together on the cheliped segment, the fifth 

 leg shorter than the third, and a spine on the outer side of its 

 last joint." 



C. tridens, sp. n., &c. 



7. Petalomera, Stimps. 



" Dromiidpe with an epipodite on the cheliped, the walking- 

 legs bearing sharp ridges, the carapace varying in the relation 

 of its length to its breadth, but usually broader than long, 

 the regions clearly or indistinctly marked, the efferent 

 branchial channels well made, the sternal grooves of the 

 female ending apart behind the cheliped segment, the fifth leg 

 shorter than the third, and without a thorn on the outer side 

 of its last joint/' 



P. gi-anulata, P. pulchra, P. I'ndica, P. lateralis *, &c. 



It is as yet impossible to assign most of the species hitherto 

 placed under iJromia, Dromidia, and Cryptodromia to any 

 of the genera above defined, owing to lack of knowledge, 

 especially with regard to the epipodites and sternal grooves. 

 Making use of such information, direct or implied, as can be 

 found in the works of former writers on the subject, as well 

 as that given by my own examination of a number of speci- 

 mens, I have placed all the species I could. Till further 

 details be forthcoming it will probably be found convenient 

 to keep the others where Alcock has placed them. No 

 doubt later knowledge will also make it needful to drop 

 several items in the diagnoses, so as to give room for species 

 which clearly belong to some particular genus but infringe 

 its definition in certain respects. Alteration may also have 

 to be made in the naming of the two genera which I 

 have called Dromidia and Cryptodromia. With regard to 

 the type species which carry these names — D. hirtissinia 

 (Lan).) and C. coronata, Stimps., — we are as yet in ignorance 

 on the all-important question of the epipodites. It seems 

 likely, however, from tiieir otiier features that they resemble 

 in this respect the species with which 1 have placed them. 



* Cryptodromia lateralis has epipodites on the clielipeds. There is 

 also a distinct tender cy to the formation of sharp ridges on the walking- 

 legs. I am inclined to think that this species should be placed between 

 the immediate ancestor from which Cryptodromia and Fetalomera arose 

 and Dromia (see trte on p. 302). In any case, the epidodites forbid its 

 being placed in Cryptodromia, and its difl'erences fi'om tJie species of 

 I'ctalomera as originally defined do not seem generic. 



