52 



it will neither be Armadillo nor Spherillo, as up to the pre- 

 sent no species are found belonging to the two genera in 

 which the exopodit on the uropods is wanting, though 

 there are species of both genera, which have it very small, 

 whilst other species of both genera have it tolerably large. 

 As the four species of Dana are belonging to the ge- 

 nus Spherillo, as I here have limited it, and thus the 

 name y> Spherillo <■< is free, I have proposed it for my pre- 

 sent genus. 



It is but with great difficulty I could contrive to set up 

 the following sections for the species of this genus, and 

 the contents of all the sections, I confess, are not all com- 

 pletely natural. The most of the species are found in the is- 

 lands of the Indian and Pacific Seas, and many of these islands 

 appear to have species peculiar to them and to present ty- 

 pes for different sections. Because these islands probably 

 are remains of earlier continents, which are tardily submersed 

 in the sea, the now living Terrestrial Isopods are relics 

 from a fauna, which has developed itself variously in the 

 different islands. 



Conspectus sectionum specierum. 



a, Pronotum breve. 



b. Pleopodes primi paris in fernina area operculari nulla fere. 

 Dorsum echinatum. 

 8ectio I. Tj'pus: Spherillo erinaceus B.-L. species 1—5. 



bb. Pleopodes primi paris in femina area operculari parva. 

 Dorsum Iseve. 

 Sectio II. Typus: Sjyherillo sollers B.-L. species 6. 



bbb. Pleopodes primi paris in femina area operculari majore. 

 Dorsum tuberculatum. 

 Sectio III. Typus: Spherillo Macmahoni Chilt. species 7. 

 aa. Pronotum longum. 



b. Pleopodes primi paris in femina area operculari magna, 

 c. Flagelli articuli longitudine subsequales. 

 Sectio IV. Typus: Spherillo hawaiensis Dana species 8. 



cc, Flagelli articulus prior altero duplo vel triplo brevior. 



