92 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
Borsonella diegensis Dali, 1908 
Plate 6, fig. 4 
Bulletin , Museum of Comparative Zoology, 43:275; PI. 13, fig. 11. 
Shell small, stout, solid, decollate, with a whitish substratum and strong 
ovilaceous perisotracum; the four remaining whorls are closely coiled and 
have the aperture longer than the remaining portion of the spire; the 
sculpture consists of a strong spiral keel; periphery on the spire with more 
or less nodulation (in one specimen with fifteen small nodules on the 
penultimate whorl, but none on the last whorl; another has them obsolete 
on the spire), stronger on the earlier whorls when present, an obscure 
ridge in front of the suture, stronger on the earlier whorls, faint spiral 
striation on the anal fasciole between the ridge and the keel, the whole 
surface covered with a microscopic, close, impressed, vermicular network 
of fine lines anastomosing in every direction; on the last whorl the keel 
is well above periphery; base evenly rounded, aperture ample, anal sulcus 
at the suture wide and deep; outer lip thin, arcuately produced; pillar lip 
smooth, with a glaze of callus, the plication on the proximal part of the 
pillar lagging behind the aperture; canal very wide and short with an 
obsolete fasciole. Length of four whorls, 15; of last whorl, 12.5; of aper¬ 
ture, 9.5; max. diam., 8 mm. (Dali.) 
Type in United States National Museum, No. 122573. Type locality, 
Station 2923, off San Diego, California, in 822 fathoms. 
Range. Off San Diego, California, to Panama, Ecuador, and Gala¬ 
pagos Islands. 
Borsonella barbarensis Dali, 1919 
Plate 6, fig. 10 
Proceedings of the United Stales Natioml Museum , 56 :37; PI. 12, fig. 6. 
Shell solid, of six or more whorls, the apex decollated, the periostracum 
greenish olive over a white substratum, yellowish on the pillar; suture 
distinct with a convex spiral band between it and the fasciole; spiral 
sculpture of a pronounced keel in front of the fasciole, on the upper part 
of the spire this keel may be more or less undulated; in front of the keel 
the surface is retractively somewhat irregularly obliquely grooved, with 
wider flattish interspaces upon which is a minute protractively looped 
sculpture giving a vermicular aspect to the surface under a magnifier; 
aperture ovate, simple, the outer lip thin, and sharp, the anal sulcus wide 
and moderately deep, the pillar straight, attenuated in front, the plait 
hidden behind it, the canal short and wide, the operculum missing. Height 
of shell, 29; of last whorl, 20; diameter, 12 mm. (Dali.) 
[92] 
