OF TERRESTRIAL ISOPODA FROM BRITISH GUIANA. 63 



Type. In collection of W. E. C. 



Paracubaris spinosus is of special interest in that it represents a type of 

 Cubaridoe only known as yet from the Western Hemisphere. The short wide 

 cephalon is very different from the form seen in Cubans, Brandt, and the 

 sloping epistome, present in some species of this last-mentioned genus, is also 

 present here, a fact which would seem to considerably weaken the importance 

 attached to this particular character by Budde-Lund, who regarded it as of 

 generic importance. 



The antennse are distinctly Oubarid, and differ from those in Cubaris only 

 by the absence of the grooves on the outer side, and in that the distal joint 

 of the flagellum is shorter than the proximal one. 



The maxillae offer no characters of importance, but the inner lobe of the 

 maxillipede is curious in possessing a setaceous pad terminally in place 

 of the usual tooth-like spines. This feature occurs in many genera of 

 Terrestrial Oniscoida, but not, so far as [ am aware, in any belonging to the 

 Cuba rid 33. 



The pleural plates of only the second mesosomatic segment exhibit any 

 thickening of the coxopodite, and these are of a very simple nature 

 (figs. 8 & 9). 



The uropoda are very distinct from those of any other genus of the family, 

 being thick and flattened with the exopodite inserted on the posterior inner 

 border of the basal plate. They extend beyond the telson. On the outer 

 lateral and posterior border of the basal plate are a number of strong short 

 spines, and a few similar ones are present on the exo- and endopodites. 



As in Minca, Pearse, the telson is triangular and does not extend to the 

 end of the metasomatic segments. 



EXPLANATION OF PLATE 6. 

 Paracubaris spinosus, gen. et sp. nov. 



Fig. 1. Dorsal view of the cephalon. x 8. 



2. Anterior view of the cephalon. X 8. 



3. Dorsal view of the right antennule. X 70. 



4. Dorsal view of the right antenna. X 14. 



5. Terminal style of the antenna. X 110. 



6. Terminal portions of the inner and outer lobes of the right 1st maxilla. X 70. 



7. Terminal portion of the left maxillipede. x 48. 



8. Ventral view of the outer margin of the 2nd mesosomatic segment, x 6. 



9. Terminal margin of the same. X 8. 



10. Dorsal view of the right nropod. x 14. 



11. Telson and last metasomatic segment, x 6. 



The author desires to thank the Carnegie Trust for the Universities of 

 Scotland for a grant to defray artist's charges. 



