Conspectus Crustaceorum qug in Orbis Terrarum circumnavigatione, Carolo £x ! 
Wilkes e classe Reipublice Faderate Duce, lexit et descripsit J. D. DANA. C er .G i 
Y ! 
[Ex Academiz Scienriarum Naturalium Philadelphbiensis Nuntiis, Anno 1851, Vol. v. p. 267.] 
PAGURIDEA. 
The Paguridea include two groups, distinguished by peculiarities in the form of 
the inner antenna, outer maxillipeds, and some other characteristics ;j—the one | 
aquatic in habit, and the other swterrestrial. They are as follows: 
Fam.I. Pacunipz.—[Inner antenne short, first joint very short. Palpus of 
maxillipeds with a multiarticulate flagellum. ^ Aquatic or littoral. 
Fam. II. Crwonrriv»5.—lIuner antenne very long, the first joint of the base 
as long as the eyes or longer, and bent obliquely downward.  Palpus of outer 
maxillipeds without a flagellum.  Subterrestrial. 
The Paguridze have hitherto been divided into but two genera; Pagwurus, with 
unsymmetrical abdomen, and Cazcellus, (Edw.) with symmetrical. There 
are, however, important characteristics, which point to a division into other 
groups. "These have been partly indicated by Milne Edwards, in the subdivi- 
sions of the genus Pagurus, laid down in his work on Crustacea,* and more 
distinctly in the Annales des Sciences Naturelles, for July, 1848.[. In the latter 
article there are discrepancies in certain instances, between the character of «he 
species and those mentioned for the subdivisions, which we find it difficult to ( 
reconcile; such as the placing of P. tibicen, and some related species, with his 
*€ /Equimanes,"? when, in fact, the left hand is very much larger than the right, É 
and the guztatus and granzulatus with the ** Senestres," although, in the former, 
the hands are nearly equal, as in many of the ** ZEquimanes," and in the latter 
the right hand (as is observed in his * Crustacés") isactually thelarger. Yet his | 
sections are, in the main, natural groups, and some of them have more important j 
poiuts of distinction than he has mentioned. 
The Paegwrus Bernhardus isthe type of one ofthese groups. Besides being 
«dextres,? they are peculiar in having aezwminate fingers, with the tips of those of | 
the larger hand ea/careous ; and although the feet of the 4th pair are subcheliform, 
like most other Paguridz, the scabrous area or rasp ofthe hand is confined nearly to 
the posterior edge. Moreover, the species belong mainly to colder waters, while the 
ordinary Paguri abound especially in the tropics. All the Paguri of England (or 
with but one uncertain exception, recently pointed out;) are of the Berzkardus 
type; those of the Northwest coast of America are the same. We naturally, 
therefore, distinguish this group asa genus under the name of BE&NHanpvs. [The 
species P. Bernhardus may be hereafter named the Bernhardus typrows.] & bubo. | 
Among the remaining Paguri, the larger part have the feet of the 4th pair sub- ^ TT 
cheliform, the penult joint being broad, and the last (or tarsus) forming a finger . 
placed on its anterior margin. Yet, a few have these feet vergiform, the tarsus 
being terminal; and these species are also peculiar, in having two pairs of slen- 
der appendages at the base of the abdomen, on account of which they are called AU 
the * Pagures appendicules?' by Edwards. Besides, they havethe flagellum of — ^ — . 
the outer antenne more or less hairy, and often long ciliate along the under side, N là 
and, also, the inner antenna have a longer base than usual, the 2d basal joint | 
j 
* Crustacés, ii, 213, and Annales des Sci. Nat. [2], vi, 257. j 
] Ann. des Sci. Nat. [3], x, 59. : 
