1510 



CRUSTACEA. 



Raninidea, Gr. Raninoides, 

 Ranina, 

 Ranilia,) 

 Cosmonotus, 

 Hippidea, Gr. Albunoea, 

 Remipes, 

 Hippa, . 

 Paguridse, Gr. Diogenes, 

 Pagurus, 

 Calcinus, 

 Aniculus, 

 Clibanarius, 

 Canctllus, 

 Cenobitidse, 



Torrid zone. 



1 



1 



1 



1 



3 



5 



2 



5 

 14 



6 



1 

 19 



1? 

 10 



Temperate zone. 





 



3 (2 torrid). 



1 (1 torrid). 



2 (1 torrid). 

 2 (2 torrid). 

 7 (1 torrid). 

 





 4 



0? 

 1 



dea have one-third to one-fourth more 



The Dromidea and Paguri 

 torrid than cold-water species. 



The Raninidea and Hippidea are mainly tropical. The two extra- 

 tropical species of Raninidea occur only in the warmer of the tempe- 

 rate regions, and the species of Hippidea in the temperate zone (eight 

 out of the whole number eighteen) have among them four that occur 

 also in the tropics. 



The Lithodea belong to the coldest temperate regions, abounding 

 especially in the subfrigid region. The Galatheidea are mainly of the 

 temperate zone; there are five known torrid species, and seven tempe- 

 rate, the latter pertaining to the colder seas. 



The genus Pbrcellana has but two-thirds as many species in the 

 temperate as in the torrid zone. Yet the subtemperate region contains 

 but one less than the subtorrid, and some of the largest species of the 

 genus occur here; while, on the contrary, the torrid zone species are 

 quite small. Although, therefore, Porcellana may rank as a torrid 

 zone genus, if we consider the relative number of species in the two 

 zones, it is more properly a temperate zone genus. 



The Paguridea range through both the tropics and temperate zone, 

 even passing into the frigid zone. Bemhardus is mainly a cold-water 

 genus, while Pagurus, Calcinus, and Clibanarius are mostly torrid 

 genera. Pagurus has seven out of twenty-one species in the tempe- 

 rate zone. But it is in the torrid zone where the species of the largest 

 size occur; the extra-torrid species belong almost exclusively to the 

 Mediterranean. The species are exceedingly prolific in the tropics, 

 far exceeding what occurs as regards any Paguridea in the temperate 

 zone. 



