920 



DR. W. T. CALMAN ON 



PoTAMOX (PoTAMOx) GOUDOTi H. Miliie-Edwarcls. 



Potamon (Potamon) goudoii H. M.-E., Rathbun, Nouv. 

 Mus. Paris, (4) vi. 1904, p. 305, pi. xiii. fig. 10. 



Measurements of Potamon goudoti. 



Arch. 



The nine specimens agree in general with the published de- 

 scriptions and figures of this species, and present no noteworthy 

 diffei-ences amono- themselves. 



Potamon (Potamon) methueni, sp. n. (Plate XCI.) 

 Measurements of Potamon methueni. 



Description. — Carapace: length about five-sevenths of its 

 breadth, very convex, especially from before backwards, gastric 

 region sometimes below level of inflated anterior branchial regions ; 

 surface finely punctate, smooth. Oblique poi-tions of cervical 

 groove shallow and obscure, if produced foi-wards they would cut 

 the line of the postorbital crest rather within the outer angle 

 of the orbit ; H-shaped depression well marked ; posterior part 

 of mesogastric region widei- than urogastric, the latter fairly well 

 defined posteriorly. On the anterior branchial region is a faintly 

 marked oblique ridge nearly parallel to the cervical groove. 



