248 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Dupricarta Dall (Myurella Troschel, not Hinds). Radula with a double row 
of arcuate solid teeth, not pierced for secretion ; no poison gland, eyes and tenta- 
cles wanting. Type Terebra duplicata Lamarck. 
SPINEOTEREBRA Sacco. Shell with no presutural sulcus, the sculpture of 
knobby ribs, the siphonal fasciole and its posterior keel obsolete. Soft parts un- 
known. Type Zerebra var. spinulosa Doderlein. Fossil of the Tortonian of Italy. 
These genera are subdivisible on the basis of the shell, as far as now known, 
and the following groups seem recognizable. 
TEREBRA Brucviire. 
Subgenus (and section). SrriorereBRuM Sacco 1871. 
Shell with uniform sculpture, relatively small, acute, a strongly marked presu- 
tural sulcus and band, whorls flattish with axial ribs and spiral sculpture, short 
canal or none, usually two keels on the pillar ; the body is destitute of callus and. 
without a raised pillar lip. Type 7. basteroti Nyst. 
A recent species is 7. dislocata Say. Noditerebra Cossmann, does not appear 
to differ essentially. 
Section FusoTEREBRA Sacco, 1891. 
Like Strioterebrum but with the axial sculpture emphasized, the spiral sculp- 
ture absent or obsolete, the sulcus feeble, and the canal more or less elongated. 
Type Fusus terebrina Bonelli, Miocene. 
A recent species of this group is Terebra benthalis Dall, West Indies. 
Section Periruo# Dall. 
Like Strioterebrum, but with the axial sculpture obsolete or absent and the 
spiral emphasized. Type Terebra circumcincta Deshayes. Acus rushii Dall is an 
American species. 
Section TrrpLostEPHaANUS Dall. 
Shell many whorled, slender, the whorls medially constricted, the sculpture 
uniform, the whorls with one or two nodulous bands in front of the suture, and a 
third angulating the base of the whorl, the spiral sculpture predominant, the axial 
(except the nodules) feeble, the body callous, with a raised inner lip. Type 
Terebra triseriata Gray. 
This group was included by Hinds in the original Myurella, but the type of the 
latter has the young and old with discrepant sculpture, the later whorls having 
the reticulation of Strioterebrum, which has therefore usually been included in 
Myurella. It also has no basal keel and the whorl is not constricted. Both Trip- 
lostephanus and Myurella, like the great majority of the family, have only a single 
marginal keel on the anterior edge of the pillar. 
Subgenus (and section) TEREBRA Ss. s. 
Young with the sculpture of Triplostephanus. Shell slender with many whorls, 
the inner lip not callous, the sulcus and sutural band obsolete or absent, and the 
surface of the whorls smooth in the adult. Type 7. subulata (.) Lamarck. 
