2(58 [SEPTEMCEn, 



reaching nearly, or quite, to the extremity of the eyes. These species make a 

 well characterized group, which we name Pagiirlstes, 



Another small group is singular in having a rostriform appendage to the 

 ophthalmic joint; they are the " Pagures armes " of Edwards, including P. 

 viiles and P. custos, the former the Canar Diogenes of Herbst. Besides this 

 distinction, the fingers of the hands are acuminated, as in the Bernhardi,and have 

 calcareous tips, although the species are not right-handed ; also, the 2d joint of the 

 outer antennas is complete on the upper side, and there is no moveable appendage 

 or acicle (a name we give to the so-called palpus, in allusion to its form). With 

 these distinctions, the group is entitled to the rank of a genus, which may be 

 named Diogenes. 



The remaining species of Pagurl are similar, in having the fingers of the hands 

 more or less spoon-shaped; with no rostriform appendage to the ophthalmic 

 segment between the eyes; the outer antennce bearing a moveable acicie; the 

 flafellum of the outer antennae naked ; the 2d joint of the base of the inner antennas 

 not reaching to extremity of eyes ; the feet of the 4th pair subcheliform with 

 the scabrous area on the hand, lateral and broad. 



The great majority of these have the tips of all the fingers corneous. But a 

 few have these tips in the larger hand calcareous, besides being peculiarly smooth 

 and neat in the appearance of the limbs, and naked, or nearly so, with the shell 

 more calcareous than usual. They have the left hand much the larger ; yet 

 unlike those species with corneous tips to the fingers that are strongly left- 

 handed, the front margin has a small salient point at middle. Of the species with 

 calcareous tips to the fingers, I make the genus Calcinus. This genus includes 

 the old species P. tihicen, Gaimardii, elegans, &c. 



The remaining species, still the larger part of the whole family, constitute the 

 genus Pagurus. The following is a synopsis of the subdivisions proposed. 



FAM. I. PAGURID^. 



Antennae interna mediocres, articulo primo brevisslmo. Maxillipedis palpus 

 externi flagello multiarticulato instructus. Species aquatics vel littorales. 



Subfam. I. PAGURiNyE. Abdomen asymmetricum. 

 I. Pedes 4ti subcheliformes. Abdomen ad basin duobus paribus appendicium 

 infra non instructura. Antennarum externarum flagellum nudum vel 



nudiusculum. 

 1. Annul ain ophthalmicum non rostriferum, Antennce internee aciculo mohili 



instructcB, 



Gen. 1. Bernhardus, D. Pedes antici depress! : digiti acuminati ; manus dextra 



major, apicibus digitorum calcarea. Macula scabra manus 4tae 



submarginalis, linearis. 



Gen. 2. Pagurus, FaJr. Manus anticae sive depressae sive compressae; digiti 



plus minusve instar cochlearis excavati, apicibus cornei; manus 



sinistra saepius major. Macula scabra manus 4taB lateralis, lata. 



Frons medio sive truncatus sive acutus. 



Gen. 2. Calcinus, D. Manus compressae, sinistra major, apicibus digitorum 



calcarea et instar cochlearis optime excavata. Frons medio acutus. 



Pedes Iceves, nudi vel nudiusculi. 



