506 
A. E. Merrill — Catalogue of Marine Mollusca. 
of the eaual ; sometimes they are mostly obsolete on the body-whorl. 
The raised, spiral cinguli are numerous, regular and close, crossing 
equally the ribs and interspaces; they are mostly alternately larger 
and smaller, and are separated by narrow, impressed grooves; the 
cinguli are crossed by very hue, close, and delicate, raised lines of 
growth, giving them a minutely wavy appearance. Aperture nar- 
row-elliptical ; outer lip evenly convex, incurved at the base of the 
canal, which is narrow and elongated and but slightly bent to the 
left, and a very little bent back at the tip ; columella slightly sig- 
moid. 
The nucleus (fig. la) is small, consisting of two whorls; the first 
whorl is minute 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, gray- 
ish white. No obvious epidermis. The largest specimen is 30 m “ 
long; breadth, 10 - 5 mm ; length of body- whorl, 19 U1IU ; its breadth, 9‘ un ' ; 
length of aperture, 15 mm ; its breadth, 4 , 5 mm . 
The median teeth of the radula have three small denticles; the lat- 
eral ones have only two denticles. 
This species was dredged oft' Martha’s Vineyard, by the 17 . S. Fish 
Com. steamer “Fish Hawk,” in 1880 and 1881 (stations 894, 895, 
925, 938, 951, 1028, 1029, 1032), in 219 to 458 fathoms. 
This shell has a sculpture much like that of S. ccelatus, but it has 
a longer and more acute spire, a longer canal, narrower aperture, and 
a different nucleus. 
In general appearance it resembles S. latericeus Morch, but it is a 
more delicately sculptured shell, with a different nucleus. It also 
somewhat resembles N. pellucidus (Hancock), in general appearance, 
but the latter has a much shorter and wider canal, and by Friele is 
considered identical with .N. latericeus. 
Sipho caelatus Terrill and Smith. 
Xeptunea (Sipho) axilla Terrill and Smith, in Terrill, Proc. U. S. Nat. Mus., iii, p. 
369, 1880. 
Plate LTII, figures 19, 19a. 
Off Martha’s Vineyard and off Newport, R. I., stations 891 to 895, 
238 to 500*fathoms, 1880; stations 947, 994, 997, 998, 1028-1030, in 
302 to 458 fathoms, 1881; oft' Delaware Bay, station 1049, 435 fath- 
oms, — IT. S. Fish Com. steamer “Fish Hawk.” 
