212 A. E. Verrill— Mollusca of the New England Coast. 
The spire is small, scarcely oblique, slightly elevated, its apex not 
rising above the level of the last whorl. Suture of the last whorl, well 
marked. The umbilicus is small, and shows within it only about one 
and a half whorls. The extreme apex is smooth, but the succeeding 
two or three whorls are covered with four or five well marked, revolv- 
ing lines, which fade out on the penultimate whorl. The last whorl, 
which constitutes the greater part of the shell, is a little inflated on 
the ventral side, with the sides slightly convex and the dorsal por- 
tion compressed ; its surface is polished and marked by faint lines of 
growth, and sometimes shows faint, microscopic, spiral lines on the 
left side. The aperture is narrow-ovate, acute above and rounded 
below. The notch is rather wide and moderately deep. 
Color, transparent white, with a faint, chestnut-brown, sutural line. 
In alcohol the animal shows several very distinct black spots. 
Diameter, about 1°25™™, 
Taken in abundance, from the surface, at station 2100, off Delaware 
Bay, N. lat. 39° 22’, W. long. 68° 34’ 30”, October 8rd, 1883 (No. 
38,397), with the temperature of the surface water 69° F.; and in 
smaller numbers at station 2038, N. lat. 38° 30’ 30”, W. long. 69° 08’ 
25”, July 26th, 1883 (No. 38,410), temperature of the surface water 
1620, 2B. 
This minute shell is easily distinguished from our other species by 
its compressed form, with closely coiled whorls and small, erect spire, 
and especially by the distinct spiral sculpture of the earlier whorls. 
. It appears to be the most abundant species off our northern coast. 
Firola Keraudrenii Eydoux and Souleyet. 
Voyage de la Bonite, Zool., vol. ii, p. 349, atlas, pl. 16, figs. 8-10, 1852. 
— Station 2038, N. lat. 38° 30’ 30”, W. long. 69° 08’ 25", twenty-five 
living; station 2039, N. lat. 38° 19’ 26’, W. long. 68° 20’ 20”, five 
living. Also at other stations, usually in company with Sagitta. 
PTEROPODA. 
Cavolina quadridentata (Les.) 
Hyalea quadridentata Rang and Souleyet, Hist. Nat. Moll. Pteropodes, p. 39, pl. 3, 
figs. 13-15. 
Souleyet, Voy. de la Bonite, vol. ii, p. 147, atlas, pl. 4, figs. 25-32, 1852. 
Station 2043, N. lat. 39° 49’, West long. 68° 28’ 30’, (No. 34,878) ; 
station 2084, N. lat. 40° 16’ 50”, W. long. 67° 05’ 15”, (No. 38,260); 
and station 2109, N. lat. 35° 14’ 20”, W. long. 74° 59’ i0”, (No. 38,252). 
