igi4.J W. E. CoLLiNGE : New Terrestrial Isopods. 209 



gine lateral! antice tantum reflexo. Annulus postabdominalis sex- 

 tus subito angustatus et triquetro acuminatus. Pedes spurii ultimi 

 paris articulo terminali parvo styliformi in apice articuli basalis 

 lati, extus rotundati inserto." 



In 1901 (4) Budde-Lund gave a further description as he 

 restricted it, but in my opinion, he had not true species of 

 Periscyphis before him, but those of an allied though totall}^ 

 different genus. Unfortunately this author does not seem at all 

 clear regarding the limits of the genus, for although it was known 

 to him in 1885, in his Crustacea Isopoda Terrcstria (i, p. 293) 

 he describes two Isopods from Egypt, which he placed in a new 

 genus Cercocytonus {convexus and albescens), but later he referred 

 these to Periscyphis, em. Budde-Lund (4), In the same paper he 

 expresses the opinion that the species he had previously brought 

 into the genus Periscyphis, Gerst. (4, p. 10) are not all rightly 

 placed, some seeming to be more akin to the genus Synarmadillo, 

 DoUfus. It is quite certain that many of the species described by 

 Budde-Lund cannot remain in the genus Periscyphis as defined by 

 Gerstaecker. The two P. convexus and P. albescens are probabl}^ 

 not txMQ Periscyphis, Gerst. s. s^y., and as the %&\i\is Periscyphis, 

 Budde-Lund, is simply an emended description of Cercocytonus, 

 Budde-Lund, they must be referred to that genus. The mouth- 

 parts, on which this author placed such great reliance, are so 

 totally different from those in Periscyphis, that they almost alone 

 would be sufficient to separate them. 



There are numerous other species which have been referred 

 by Budde-Lund (3) and other authors to this genus which seem to 

 me wrongly placed. 



Gen. Cubaris, Brandt. 



Cubaris fragilis, n. sp. 



(PI. XXV, figs. I-IO.) 



Body oblong oval with the lateral margins of all the segments 

 angulate and overlapping one another ; finely punctated and with 

 rows of longitudinal tubercles at each side of mid-dorsal line. 

 Cephalon (fig. 2) narrow, almost straight in front with small 

 triangular lateral lobes; median lobe absent. Eyes subdorsal, 

 fairly large. Antennae (fig. 3) short, first four joints tuberculated, 

 flagellum two-jointed, distal joint two and a half times longer 

 than proximal joint. Mandibles (fig. 4), outer cutting edge with 

 trifid blunt tooth, with flattened one on the inner side, ist 

 maxillae (figs. 5, 6). Outer lobe oblong, pointed proximally, termi- 

 nating distally in nine incurved spines; short, simple, hair-like 

 setae on the outer margin ; inner lobe distally terminating in a 

 rounded lobe with two setaceous tufts on the inner side. 2nd 

 maxillae small and plate-like. The segments of the mesosome 

 strongly convex, with three to seven raised longitudinal tubercles 

 on each side of the mid- dorsal line, finely punctated, the lateral 

 plates of 1-5 well separated and slightly revolute. Maxillipeds 



