336 PROCEEDINGS OF THE ACADEMY OF [PaRT II 



slight off-set or ledge encircling the last whorl a short distance 

 (nearly 3 mm.) below the suture. On the whoils of the spire this 

 is concealed by a smooth callus deposit over the inter-sutural space. 

 The spire is straightly conic up to the nipple-like 2 or 3 apical whorls. 

 The inner lip has about 15 strong, evenly spaced plaits. 



Length 28.5, diam, 12 mm.; aperture, measured to suture, 20 mm. 



The type, with two slightly smaller specimens, is no. 2998 A. N. 

 S. P 



Oliva dimidiata Pils. and Johns. Plate XXIII, fig. S. 



Proc. A. N. S. Phila., 1917, p. 165. 



Olivella muticoides (Gabb) Plate XXIII, flgs. 5, 6, 7. 



Oliva mulicoides Gabb, Tr. Am. Philos. Soc, xv, 187.3, p. 215. 

 Oliva canaliculata Gabb, torn. cit. p. 215. Not of H. C. Lea. 



Gabb's two descriptions apply to the high- and low-spired ex- 

 tremes of a single species. The large series before us contains com- 

 pletely transitional examples. 



A thick labial callus extends from the basal fasciole to the suture, 

 its abrupt edge straight and parallel with the lip. 



Length 19.8, diam. 8 mm., length of aperture 13 mm. (type of 

 multicoides) . 



Length 18, diam. 8.5 mm., length of aperture 13.3 mm. (type of 

 canaliculata) . 



Of the three specimens figured, fig. 7 represents the type of muti- 

 coides fig. 6 a transitional example, and fig. 5 the type of canalic- 

 ulata. 



The type and two other specimens of 0. muticoides are no. 2805 

 A. N. S. P.; the type of 0. canaliculata is no. 2806 A. N. S. P.; nu- 

 merous other specimens. 



Olivella fioralia (Duclos) 



Olivella oryza Lam., Gabb, Tr. Am. Philos. Soc. xv, 1873, p. 215. 



Olivella indivisa Guppy, Proc. U. S. Nat. Mus. xlx, 1896, p. 308, pi. 30, fig. 10. 



We can find no character to distinguish this from the recent spe- 

 cies of the same region. 



Olivella mutica (Say) 



Oliva mutica Say, Journ. Acad. Nat. Sci. Phila., ii, 1822, p. 22. 



Valuta nitidula Dillwyn, in part, and of authors; not of Deshayes, 1837. 



Several specimens agree in every way with the recent form. Va- 

 luta nitidula Dillwyn was a composite species, including mutica 

 Say and 0. pusilla Marratt. If the name is used at all, we suggest 

 that it be taken for 0. pusilla. 



