316 PROCEEDINGS OF THE NATIONAL MUSEUM. xoL.na. 



angle acuto; outer lip thick within, thin at the edge; inner lip some- 

 what curved, slightly twisted, reflected over and appressed to the 

 base; parietal wall covered by a moderately thick callus. 



The type and three specimens (Cat. No. 105578, U.S.N.M.) were 

 collected at Point Abrcojos, Lower California. The type has nine 

 whorls, and measures — length, 3.1 mm.; diameter, 1 mm. Twelve 

 additional specimens of the same locaUty are in ^Irs. Oldroyd's 

 collection. 



MELANELLA (MELANELLA) TACOMAENSIS, new species. 



Plate 38, fig. 5. 



Shell small, straight, broadly elongate-conic, bluish-white, except 

 where the animal shines through, there it appears golden brown; 

 surface marked by exceedingly fine lines of growth and almost invis- 

 ible microscopic spiral striations. Whorls flattened, separated by a 

 scarcely defined suture; the basal portion of the preceding whorl 

 shining through the substance of the succeeding turn appears as a 

 conspicuous false suture. Periphery obscurely angulated ; base short, 

 flattened, the left margin very obliquely sloping. Aperture moder- 

 ately large; posterior angle acute; outer lip verj'" thick within, thin 

 at the edge, decidedly protracted a little anterior to the middle 

 between the posterior angle and the base ; inner lip very stout, some- 

 what flexuose, reflected over and appressed to the base; parietal wall 

 covered with a thick callus. 



The type (Cat. No. 159268, U.S.N.M.) was collected by Mr. Fisher 

 at Tacoma, Washington. It has 10 whorls and measures — length, 

 5 mm.; diameter, 2.1 mm. The sloping base gives the basal portion 

 of the shell a decidedly oblique appearance, v/hich distinguishes this 

 form from all the other straight Melanellas from the west coast. 



MELANELLA (MELANELLA) GABBIANA Anderson and Martin. 



Plate 38, fig. 3. 



Eulimella gabbiana Anderson and Martin, Proc. Cala. Acad. Sci., ser. 4, vol. 4, 

 1914, p. 68, pi. 7, fig. 20. 



"Shell very small, slender, and smooth, polished, with numerous 

 whorls; apex acute (broken in the type-specimen), whorls nearly 

 flat, unsculptured ; suture appressed, indistinct; base imflattened; 

 aperture ovally elongated; outer lip sharply roimded anteriorly; 

 inner lip concave, incrusted. 



"Dimensions. — Altitude of the figured specimen, upper whorls lost, 

 4 mm.; maximum width, 1.3 mm. 



"Occurrence. — Lower Miocene of Kem River, California, locality 64. 



"This species is distinguished by its small size, slender and smooth 

 form and its long narrow aperture. 



