24G On a new Species of Unio (Cuneopsia). 



anterior canal circular, not piercing quite througii the lip, 

 posterior canal cutting about Iniilway only through peristome; 

 operculum horny, smooth, about 5 whorls. 



Alaj. diam. 4^, alt. 9 mm. 



Ilab. Port Curtis, Queensland. 



Intermediate between p^anilabris, Pfr., and densecoatata, 

 Fult. ; it is smaller than the former species, not so smooth, 

 and the anterior canal is situated lower, the opening as seen 

 from the front being larger ; from the latter species it differs 

 in having one whorl less, rather less conspicuous sculpture, 

 and the whorls are also less convex and increase more rapidly 

 than in densecostata. I have seen this shell labelled as 

 P. Coxi, Morelet, but that species, according to the type 

 specimen now in the British Museum, is the same as 

 P. planilabris, Pfr. 



XXXII. — Description of a new Species of Unio (Cuneopsis) 

 from Yunnan. By HuGH 0. FuLTON. 



[Plate IX.] 



Unio (Cuneopsis) tauriformis, sp. n. (PI. IX. fig. 9.) 



Shell obliquely ovate, truncate anteriorly, wedge-shaped 

 posteriori}', solid, periostracum dark, having a silky lustre, 

 exterior umbonal region with raised zigzag ridges, concentric 

 strife below, the urabones turned slightly inwards, decorti- 

 cated ; two cardinal teeth in the left valve, the anterior rather 

 thin, the posterior thick with a deep triangular pit between, 

 right valve with one thick cardinal tooth situate below the 

 umbo, lateral teeth long and roughly striated; nacre silvery ; 

 a deep pit marks the place of the anterior adductor, the 

 posterior scar being only moderately indented. 



Diameter : anterior-posterior 31 mm., umbo-ventral margin 

 20 ; thickness 16^. 



Hab. Yunnan-fu, Yunnan. 



I have been unable to find any species closely allied to this, 

 which I take to belong to tlie genus Cuneopsis, Simpson 

 (Proc. U.S. Nat. Mus. vol. xxii. lUOO, p. 804). 



