44 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 95 



No. of Height Diameter No. of Height Diameter 



whorls in mm in mm whorls in mm in mm 



6.4 8.1 3.g 5.4 7-6 3-9 

 (>-2, 7-8 37 5-4 6.7 3.5 

 7.0 8.3 2.6 5-4 7-9 4-2 



6.5 8.3 3-8 5-2 7-2, 3.7 

 6.2 8.1 3.9 7.2 7.5 3.5 

 6.7 7-9 3-5 7-2 8.0 3.6 

 6.7 7.6 3.7 6.0 7.2 3.5 

 6.9 8.7 3-9 6.7 7-9 3-7 

 7.0 8.4 3.5 6.4 8.6 3.9 



6.2 8.2 3.8 6.4 7.3 3.5 



6.6 8.1 3.9 6.3 7-7 3-9 



6.3 8.1 3.7 6.4 7.9 3-8 

 7.2 7-2, 3-6 6.3 7.4 2,-(^ 

 6.6 8.6 3.8 5.2 7.1 3.8 



7.4 8.9 3.9 6.0 8.1 2.7 

 5-8 7.6 3-8 6.4 7-8 3.5 

 6.2 7.7 3.6 s-s 7-7 3-9 

 7.0 8.1 3.6 6.5 7.7 3.9 

 5-5 7-f' 3-8 



Greatest " 7.4 9.3 4.2 



Least * 5.2 6.7 3.5 



Average " 6.38 8.04 3.77 



•' Of 47 specimens. 



ONCOMELANIA ELONGATA, n. sp. 



Plate I, fig. 15 ; plate 2, fig. 15 ; plate 5, fig. 4 



Shell elongate-conic, wax yellow, the remaining nuclear whorls 

 finely microscopically granose. Early postnuclear whorls marked by 

 incremental lines which slowly develop into axial ribs, which are not 

 heavy, rather flattened, of irregular strength and spacing. The inter- 

 costal spaces and axial ribs are marked by incremental lines and show 

 a somewhat malleated aspect. Suture strongly constricted. Periphery 

 well rounded. Base well rounded, narrowly umbilicated and marked 

 by the continuation of the axial ribs. There is a very strong varix 

 a little behind the peristome. The aperture is broadly oval with the 

 peristome expanded and reflected and adnate to the preceding turn 

 on the parietal wall. The operculum is typically oncomelanid. The 



radula has the typical rachidian tooth — — , also the typical lateral 



of 2-1-3 ; the inner marginal has 7 denticles, the outer 5. 



The type, U.S.N.M. no. 420954, was collected by Dr. Li in Chekiang 

 Province. It has 9.5 whorls and measures: Height 10 mm; diameter 

 4 mm. It has 13 ribs behind the varix on the first whorl, 16 on the 



