II 



DESCRIPTIONS OF NEW TERRESTRIAL MOLLUSCA FROM 

 NORTH-WEST CHINA. 



By H. B. PiiESTON, r.Z.S. 



Bead 10th November, 1911. 



EuLOTA (Cathaica) Okestias, n.sp. 



Shell I'utlier small, perforate, depressedly turbinate, whitish above, 



painted witli a siipersuturul baud of reddish chestnut, which appears 



as a superperipheral band on the last whorl ; base of shell ornamented 



with two or three zones of pale brown, which are transparent, and 



i^etween which the ground-colour is of a rather yellowish white; 



wliorls 5J, the apical whorls pale tlesh- colon red and smooth, the 



remainder somewhat coarsely plicate and sculptured with very fine, 



wavy, spiral stria}, which become more noticeable on the base of the 

 sliell ; suture impressed; umbilicus rather narrow, deep; columella 

 thin, outwardly expainied, descending in an abrupt curve ; labrum 

 simple, except at the base, where it is sliglitly internally thickened ; 

 aperture broadly and iiregularly sub-lunate. Alt. 6"5ram. ; diam. 

 niaj. 10'25, min. 9mm. Aperture: alt. 3''25, diam. 3"75mm. 



Ilah. — Mountains of S.E. Kaii-su, at an altitude of frum 2,000 to 

 5,000 feet. 



EuLOTA (Plectotkopis) Wakdi, n.sp. 



Shell very depressedly orbicular with slightly convex base, acutely 

 cariiiated at the ])eri|)hery, rather thin, light bronze colour, somewliat 

 shining; whorls 5J, the last abruptly descending in front, sculptured 

 with closely set, arcuat-e costulpe, liecoming mucli finer on the base, 

 which is also sculptured with slightly distant, fine, i-evolving striae ; 

 suture impressed, margined above with a narrow whitish callus which 



forms the carina on the last whorl ; umbilicus very wide, open, 

 moderately deep; labrum tbiekened, especially at the base, narrowly 

 expanded, reflexed, continuous ; aperture obliquely sub-quadrate, 

 somewhat nasute in front. Alt. 5-5 ram. ; diam. maj. 18-5, min. 

 16 mm. Aperture: alt. 4-5, diam. 7 mm. 



//rt/5'. — Limestone region, S.E. Kan-su, at an altitude of 3,000 feet. 



A marvellously beautiful species, which I have much pleasure in 

 dedicating to the discoverer. 



