DECAPODA. 59 



The true Paguri — Pagurus, Latr. — on the contrary, have the me- 

 diate antennae curved, niucli shorter than the lateral ones, with the 

 two filaments short, the superior forming an elongated or subulated 

 cone: the anterior division of the thorax is square, or forms a re- 

 versed and curvilinear triangle. They inhabit marine shells. 



The Hermit^ — Cancer Bernhardus, L., Herbst., XXII, 6; Fa- 

 gurus streblonyx, Leach, .Malac. Brit., XXVI, 1 — 4, — is of a 

 mean size. Its two claws are bristled with spines, with the for- 

 fceps almost in the shape of a heart, the right one being the 

 largest. The last joints of the ensuing feet are also spinous. 

 It is very common in European seas. A second but fossil spe- 

 cies, the Fagure de Faujas, — Desmar., Hist. Nat. des Crust. 

 Foss., XI, 2, — is closely allied to it. 



A third species, the Fagurus angulafus, Risso, Crust, de 

 Nice, I, 8; Desmar., Consider., XXX, 1, is remarkable for its 

 forceps, Avhich are strongly sulcated with longitudinal ridges. 

 The right one is the largest(l). 

 A fourth from the same sea is removed from the preceding by 

 several characters, and merits the distinction of forming a separate 

 subgenus, the Prophylax, Latr. The tail, with the exception of 

 the superior surface of the three last segments, instead of being soft 

 and arcuated and having but a single range of oviferous filaments, 

 is covered with a coriaceous tegument, is straight, and is only curved 

 beneath at its extremity^ its inferior surface presents a groove and 

 two rows of false feet. The body also is linear, and the two lateral 

 appendages of the end of the tail are almost equal, the larger divi- 

 sion being foliaceous and ciliated. The last four feet are slightly 

 granulated at their extremity, and appear to be terminated by a sin- 

 gle finger, or at least are not distinctly bifid. Perhaps we should 

 refer to this division those Paguri which inhabit the Serpulae, and 

 Alcyonii, such as the Fagurus tuhularius, Fab. 



In all the following Macroura, the two posterior feet at most are 

 smaller than the preceding ones. Most generally the sub-caudal 

 false feet form five pairs. The teguments are always crustaceous. 

 The lateral fins of the penultimate segment of the tail, and its last, 

 form a common one arranged like a fan. 

 The two subsequent sections possess a common character, which 



(1) For the other species see the article Pagure, Encyc. Method.; the Atlas 

 d'Hist. Nat., of the same work; Desmarest, Consider. Ge^ier. sur la Classe des 

 Crust. ; the plates of the Voy. de Freycinet. We should observe that in the figure 

 ofthe Cancer megistos, Herbst., LXI, 1, the tail is false; this arises from the fact that 

 the tail was wanting in the individual from which the drawing was made, the artist 

 supplying it by copying the fin-tail of an ordinai-y Macroura. 



