Jheringula paulensis, a new generic Type of Macrothricidæ. 5 



distance from the tip. Antennæ powerfully developed, re- 

 sembling in structure those in Macrothrix. Legs likewise 

 rather similar, except the last pair, which are distinguished 

 by the presence of a large and very delicate trilobate plate 

 outside the base. Tail rather unlike that in Macrothrix, 

 oblong quadrangular in form and very mobile, caudal claws 

 small, caudal setæ greatly developed. Intestinal tube simple, 

 Avithout any cœcal appendages or coil. Ephippium Avell de- 

 fined, coarsely reticulate, and containing, as a rule, 2 ova 

 placed closely together in a circular, central hollow. 



Remarks. — This new genus is nearly allied to Macro- 

 thrix, but may easily be distinguished by the presence of a 

 deep dorsal depression defining the cephalic shield from the 

 carapace. Moreover the antennulæ are of somewhat different 

 structure, and the last pair of legs more fully developed, 

 being provided at the base with a large plate, of which no 

 trace is to be found in Macrothrix. Finally, the tail is of 

 a very different appearance, and much more freely mobile. 

 The genus as yet contains only a single species. 



Jheringula paulensis, G. O. Sars, u. sp. 



(PL I & II.) 



Specific Characters. — Carapace in female rather 

 tumid, and, seen laterally, rounded quadrangular in outline, 

 being almost transversely truncated behind, with the upper 

 corner nearly rectangular, the lower rounded off, dorsal margin 

 but slightly convex, ventral moderately arcuate in the middle. 

 Cephalic shield exceeding half the length of the carapace. 



