24 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.65 



spaces, all of which sculpture may have been concealed in the perfect 

 shell; aperture slightly shorter than the last whorl; outer lip 

 sharp, very slightly protractively arcuate, receding anteriorly and 

 deeply rounded into the pillar lip, which is thickened and pro- 

 vided with a prominent sharp plait; body with a smooth coat of 

 enamel; length of shell, 20; of last whorl, 18.5; of aperture, 16; 

 maximum diameter, 10 mm. 



Type.— Ciit. No. 352346, U.S.N.M. 



This is larger than any other species of the coast and is less 

 cylindrical than A. culcitella Gould, the most nearly allied species. 

 A specimen which has lost the nucleus is 23 mm. long and 10.5 mm. 

 in diameter. 



MARGINELLA JEWETTII NANELLA. new subspecies. 



Plate 2, fig. 8. 



■Shell much like typical jeivettii but uniformly smaller, more 

 slender proportionately, somewhat less wide at the shoulder, and 

 while jewettii usually has five plaits, including that on the edge 

 of the pillar, this variety when adult often has as many as eight. 

 Relative dimensions are: 



M. jewettii; length, 5.5 ; maximum diameter, 4.5 mm. 

 M. nanella; length, 5.0; maximum diameter, 3.7 mm. 



Type,— Csit. No. 352361, U.S.N.M. 



Many M. jewettii are larger than the average specimen above 

 cited, but the size of specimens of the fossil variety is suprisingly 

 uniform. Many specimens of the latter have been examined. 



ALIA TUBEROSA MAJOR, new sabspecies. 



Plate 2, fig. 11. 



Shell like the typical recent form, with the same number of 

 whorls but uniformly much larger. Comparative measurements 

 for specimens of eight whorls are: 



A. tuherosa; length, 8; maximum diameter, 3.8 mm. 

 Var. major; length, 11 ; maximum diameter, 5.0 mm. 

 Type.— Cat No. 352369, U.S.N.M. 



TURBONILLA (STRIOTURBONILLA) PECORA, new species. 



Plate 1, fig. 6. 



Shell of medium size, elongate turrited, yellowish white. Nuclear 

 whorls two and a half, forming a somewhat depressed helicoid spire, 

 the axis of which is at right angles to that of the succeeding turns, in 

 the first of which the tilted edge of the last whorl is one-fifth im- 

 mersed. Postnuclear whorls almost flattened, almost tabuhitely 

 shouldered at the summit, marked by strong, decidedly protractively 



