434 A HISTOEY OF BECENT CEUSTACEA 



pigmented eyes. The only species is Pseuda/rmadillo cwrv- 

 nulatus from Cuba or Mexico. 



Per(/sc^p/M«, Gerstaecker, 1873, has three species, Peri/- 

 scypJns' i/rivialis, Gerstaecker, from an East African Lake, 

 and two others from Egypt, for which at first Budde-Luiid 

 established a new genus Gercocytonus, which he cancels in 

 the same volume. The meaning of Gercocytonus is obscure. 

 Probably Cercoxytonus was intended, meaning with acumi- 

 nate tail. Peryscyphis was no doubt a misprint for Peri- 

 scyphis, the name alluding to the convex form of the 

 animal. 



Sphoeroniscus, Gerstaecker, 1854, has small eyes, the 

 second antennse short, with a three-jointed flagellnm. 

 The single species is 8phceroniscus flavomaculatus, from 

 New Granada. Budde-Lund thinks that Pyrgoniscus cinc- 

 tutus, Kinahan, 1859, from Eastern regions, may belong to 

 this genus. 



Cylloma, Budde-Lund, 1879, has very large prominent 

 eyes, the third joint of the first antenuEe very long, all the 

 pleopods with tracheal opercula. The single species Gylloma 

 oculatum is from New Zealand. 



JSluma, Budde-Lund, 1879, has simple, minute eyes, the 

 fiagellum of the second antennse two-jointed, the opercular 

 branch of the first and second pleopods tracheal, the ter- 

 minal segment of the pleon subtriangular, the uropods 

 reaching beyond this, but not beyond the postero-lateral 

 angles of the preceding segment ; the outer branch of the 

 uropods is flattened, laminar. The type is Elnma purpu- 

 rascens, Budde-Lund, 1879, from Madeira, the Azores, 

 Algeria, and Portugal. It is possible that this is synony- 

 mous with the earlier Armadillidium ccelatum, Miers, 1877. 



^Armadillidium, Brandt, 1838, has the flagellum of the 

 second antennse two-jointed, the opercular branch of the 

 first and second pleopods tracheal, the terminal segment of 

 the pleon with the apex variable, not produced beyond the 

 angles of the preceding segment, the uropods not reach- 

 ing beyond the terminal segment. Budde-Lund describes 

 thirty species, and names eight others attributed to this 

 genus. I)ollfusinl887 adds five new French species, iSi'mom, 



