130 PAGURUS VARIPES. 



inhabits the shell of a Bulla ampxdla , which is covered on 

 its outer surface by three Actiuiae ; it is an adult speci- 

 men , as I believe , and larger than that of the Djeddah 

 shores. In consequence of this larger size the two last 

 joints of the third pair of legs on the left side are some- 

 what diiferently shaped : the upper margin of the external 

 surface of the penultimate joint, which is finely denticu- 

 lated in the younger Djeddah specimen , is nearly entire 

 in the individual from Banda-Neira , the teeth being worn 

 out; the last joint or tarsus has a more elongate appear- 

 ance, being comparatively less broad at its base than in 

 the Djeddah specimen ; the teeth of the upper margin ot 

 the external surface being also a little worn out. The 

 peduncle of the external antennae in the specimen of 

 Banda-Neira is distinctly longer than the eye-peduncles , 

 (as should be in our species, according to the original 

 description), but in the younger Djeddah individual the an- 

 tennal peduncles have the same length as the eye-pedun- 

 cles ; I regard these diöerences as caused by difierence in age. 

 With regard to the width of the anterior margin of the 

 carapace , the eye-peduncles in the adult Banda-Neira spe- 

 cimen are comparatively shorter than in the younger Red 

 Sea individual , though having in both the same absolute 

 length: it seems therefore that when our Pagurus has at- 

 tained to the age of the Djeddah specimen the eye-pe- 

 duncles do no more increase in length , though they be- 

 come thicker and coarser, when it attains to the adult 

 state. For the rest our specimens are quite similar to each 

 other. 



As regards the Japanese Fagurus asper de Haan (Fauna 

 Jap. pag. 208, tab XLIX, fig. 4), I think it to be most 

 nearly allied to our Fagurus varipes , but distinguished by 

 the outer surface of the penultimate joint of the third pair 

 of legs on the left side being convex ; and its upper and under 

 margins not being carinated and deyiticulated as in Pag, 

 varipes. The original specimen of Pag. asper F. Jap. has 

 not been found back by me. 



r^ote« from the Leyden Museum, Vol. III. 



