DOLICHRULOTA. 19 



naturally treat tlie present one as a genus. Whether such minute 

 subdivision of all Helicid genera as some authors advocate will 

 eventually win general acceptance is still uncertain, but in my 

 opinion over-division of genera defeats the end of nom nclature, 

 losing sight of the characters of real importance. 



My opinion of the position of this group is based upon the sculp- 

 ture and system of coloration of the shells. The species have hitherto 

 been placed in Bulimus (Pfeitfer), Amphidromus (Kobelt, von Mo-l- 

 lendorff'el /.), and Cochhstyla (Paetel). 



D. SWINHOEI (Pfeiffer). PI. 2, figs. 24,25. 



Shell umbilicate, ovate-conic, rather thin, obliquely striatulate, 

 decussated by very close spiral striae ; tawny, irregularly ornamented 

 with brown and blackish streaks. Spire convexly conic, pale 

 above, the apex acute, whorls 6|, a little convex, the last shorter 

 than the spire, rounded beneath. Aperture a little oblique, truncate- 

 oval, bluish-pearly within ; peristome simple, thin, the right margin 

 narrowly expanded, the columellar margin broadly reflexed, over- 

 hanging the umbilicus. Length 35, diam. 20 mill.; aperture 18 mill, 

 long, 11 wide (Pfr.). 



Formosa (Swinhoe; type in Cuming coll.). 



Bulimus swinhoei PFR., P. Z. S. 1865, p. 830, pi. 46, f. 2, 2a ; 

 Malak. Bl. xiii, 1866, p. 42 ; Monogr. vi, p. 56 ; viii, p. 69. Am- 

 phidrornus swinhoei MLLDFF., Jahrb. xi, 1884, p. 163. 



I have seen a single dead and bleached specimen of this species, 

 collected by Prof. Steere. It differs from D. formosensis chiefly in 

 the thin, much less developed lip. The name is preoccupied in 

 Euhadra; and if Dolicheulota really proves to have the anatomy of 

 that group, as I believe, the present species will require a new name. 

 I would suggest E. swinhoeana. 



D. FORMOSENSIS (H. Adams). PI. 2, figs. 26, 27, 28. 



Shell umbilicate, oblong-conic, solid, covered with an olivaceous 

 brown cuticle, which is variegated by some light flames or spots, and 

 rather indistinct spiral bands ; usually denuded toward the apex, 

 where the whorls are brown above, whitish below. Surface some- 

 what shining, with irregular growth-wrinkles and fine, close, clearly- 

 engraved spiral striae, sometimes subobsolete on the last whorl. Spire 

 conic, with more or less convex lateral outlines. Whorls 7-7^, 



