PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 321 



incurved at the base of tlie canal, wliich is narrow and elongated, and 

 but slightly bent to the left and a very little bent back at the tip ; 

 columella slightly sigmoid. 



The nucleus is small, consisting of two whorls ; the first whorl is mi- 

 nute and turned obliquely upward and inward, with a smooth glossy 

 surface, crossed by a few small transverse grooves ; the next whorl is 

 regular, smooth at first, then with fine spiral lines ; the normal sculpture 

 begins on the third whorl. Color of shell, grayish white. No obvious 

 epidermis. 



The largest specimen is 30™" long; breadth, 10,5™" ; length of body- 

 whorl, 19™™ 5 its breadth, 9™™ ; length of ai>erture, 15"^™ ; its breadth, 4.5"'™. 



This species was dredged off Martha's Vineyard, by the United States 

 Fish Commission steamer. Fish Hawk, in 1880 and 1881 (stations 891, 

 938, 951, 1028, 1029, 1032), in 219 to 458 fathoms. 



This shell has a sculpture much like that of S. cidatus V., 1880, but it 

 has a longer and more acute spire, a longer canal, narrower aperture, 

 and a different nucleus. In general appearance it resembles 8. latericeus, 

 but it is a more delicately sculptured shell, with a different nucleus. It 

 also somewhat resembles 8. pellucidus (Hancock) in general appearance, 

 but the latter has a much shorter and wider canal. 



According to the nature of the nucleus this shell would belong to the 

 subgenus, 8iphonorMs Morch. 



Sipho parvus Verrill and Smith. 



Slplw mrvusYtivi'iW aucl Smith, in Verrill, Trans. Conn. Acad., v, p. 504, pi. 57, 

 tigs. 20, 20&, June, 1882. 



Shell small, thin, delicate, translucent, subfusiform, with a rather 

 slender, acute spire; a short, straight canal; and few raised, revolving 

 cinguli. 



Whorls six, convex, usually with three (rarely five or six) prominent 

 rounded cinguli or carinre, separated by much wider, broadly concave 

 interspaces; the uppermost one is usually some distance below the 

 suture, which is imjjressed; on the last whorl there are about seven to 

 nine principal carina, occasionally with a smaller one interpolated, and 

 becoming more crowded anteriorly ; delicate and close, raised lines of 

 growth cover the interspaces and cross the raised cinguli. 



The nucleus is very small, smooth and glossy ; the first turn is minute 

 and regularly spiral, not upturned; three spiral cinguli appear on the 

 second whorl. Aperture elliptical; outer lip thin, rounded, incurved 

 at the base of the canal, which is narrow, but very short and straight ; 

 columella nearly straight in the middle. The epidermis is thin, lamel- 

 lose, but not ciliated. 



Color yellowish or grayish white. Operculum ovate, with the smaller 

 or left end rounded and incurved, forming a small lobe, defined by a notch, 

 and with the nucleus central to this small lobe. 



Proc. Nat. Mus. 82 21 Sept. 5, 1889. 



