ANOMOURA PAGURIDEA. 433 



The Paguridse have hitherto been divided into but two genera, 

 Pagurus including the species with an unsymmetrical or one-sided 

 abdomen, and Cancellus, of Edwards, those with a symmetrical abdo- 

 men. There are, however, important characteristics which point to 

 a division into other groups. These have been partly indicated by 

 Milne Edwards in his subdivisions of the genus Pagurus, in his work 

 on Crustacea,* and more distinctly in the Annales des Sciences Natu- 

 relles, for July, 1848.f In the latter article, there are, in certain 

 instances, discrepancies between the character of the species and those 

 laid down for the subdivisions, which we find it difficult to reconcile, 

 such as the placing of P. tibiceti, and some related species, with his 

 "iEquimanes," when the left hand is very much larger than the 

 right, and the guttatus and gramdatus, with the " Senestres," although, 

 in the former, the hands are as nearly equal as in many of the 

 "iEquimanes," and in the latter, the right hand (as stated in his 

 Crustaces, and in fact) is actually the larger. Yet, his sections are, 

 in the main, natural groups, and some of them have more important 

 points of distinction that he has mentioned. 



The Pagurus Bernhardus is the type of one of these groups; and, 

 besides being usually " clextres," or right-handed, as made in the ar- 

 rangement just alluded to, they are peculiar in having acuminated 

 fingers, with calcareous tips on the larger hand; and, although the 

 fourth pair of feet are subcheliform, the scabrous area or rasp of the 

 hand is confined nearly to the posterior edge, in these species ; and, 

 also, the species are mainly inhabitants of cold waters, while the ordi- 

 nary Paguri live in warm water, and abound in the tropics. All the 

 Paguri of England are of the Bernhardus type, with a single doubtful 

 exception ; those of the northwest coast of America are the same : 

 we naturally, therefore, distinguish this group as a genus, under the 

 name Bernhardus. 



Among the remaining Paguri, the larger part have the fourth pair 

 of feet subcheliform, terminating in a small broad hand, with the 

 tarsus placed on the anterior margin of the hand, forming a finger. 

 Yet, there are a few in which these feet are vergiform, and the tarsus 

 is terminal, as in the preceding pairs of legs. These, moreover, have 

 two pairs of appendages at the base of the abdomen below : the species 

 are the " Pagures appendicules" of Edwards. They are also peculiar in 



* Crustaces, ii. 213 ; see also Annales des Sci. Nat. [2], vi. 257. 

 f Annales des Sci. Nat. [3], x. 59. 



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