34 CRUSTACEA. 



having the flagellum of the outer antenna more or less hairy, and 

 often Ion- ciliate, and also the inner antennae are longer than the 

 eyes, the second basal joint reaching to the extremity of the eye- 

 peduncle. So many peculiarities warrant us in placing the species in 

 a distinct genus, which we name Paguristes. 



Another small group is peculiar in having a rostriform appendage 

 to the ophthalmic joint; they are the "Pagures armes" of Edwards, 

 including P. miles and P. custos. Besides this, the fingers of the hand 

 are acuminated, as in Bernhardus, and calcareous at tip, yet the 

 species are not right-handed as in that group. Of these we make the 

 genus Diogenes. 



The other s^Deries are similar in having the fingers of the hands 

 more or less spoon-excavate; no rostriform appendage to the ophthal- 

 mic segment between the eyes; the basal part of the outer an- 

 tennae furnished above with a moveable acicle; the flagellum of 

 the outer antennae naked or nearly so; the inner antennae never 

 exceeding the length of the eyes by the length of the third joint ; the 

 fourth pair of feet subcheliform, with the scabrous area on the hand 

 lateral and broad. The great majority of these species, large as well 

 as small, have the tips of all the fingers corneous. But a few have 

 these tips in the larger hand calcareous, besides being peculiarly 

 smooth in the appearance of the limbs, and naked or nearly so. These 

 have the left hand much the larger; yet, unlike the strongly left- 

 handed species with corneous tips, the front margin has a small salient 

 point at the middle, like most equal-handed species with corneous tips. 

 Of the species with calcareous tips to the fingers, we make the genus 

 Calcinus. Of the remainder, part have the fingers opening vertically, 

 while a well-characterized group have them opening horizontally ; the 

 former have the hands usually very unequal, and in general a trun- 

 cate front, while the latter have nearly equal depressed hands, and a 

 small rostrum or triangular median point to the front. The latter 

 constitute the group ClibAnarius, and the former include the groups 

 Pagurus and Aniculus. The former (Paguri) have the front truncate, 

 without any appearance of a median point, while the latter (Aniculi) 

 have a prominent point or rostrum, besides subequal hands. Ani- 

 culus forms the passage between Pagurus and Clibanarius ; the gene- 

 ral habit is that of the latter, while the fingers have the vertical 

 motion of the former. 



The following are the genera, with their characteristics :— 



