DALL: MOLLUSCA AND BRACHIOPODA. 249 
Section Myurnzta Hinds, 1844. 
Young with double nodulous band and strong suleus in front of the suture, 
shell many whorled, the whorls not constricted, in the adult the nodules obsolete 
and the band and sculpture as in Strioterebrum, inner lip callous and elevated. 
Type Terebra myuros Lamarck. 
See remarks under preceding section. The sulcus is persistent in the adult, 
though the character of the band alters. 
Section SuBULA Sehumacher, 1817. 
Young with presutural suleus and band, band and body regularly axially 
ribbed, the whorl not constricted. Adult shell with many slender whorls, 
Smooth, but with the sulcus persistent; inner lip not callous, other features as in 
Terebra, Type Terebra dimidiata (Linné). 
This is the second section of Schumacher’s Subula to which the name was 
restricted by Gray, in 1847. 
Section AnnxTIA H, and A. Adams, 1853. 
Shell small, sculpture uniform, but in the later whorls more or less obsolete, 
sulcus persistent, whorls axially evenly ribbed, not constricted; young acute, 
adult subeylindric; columellar lip callous; the posterior angle of the aperture 
Compressed into a sort of channel, Type Terebra cerithina Lamarck. 
Section Oxymuris Dall, 1900. 
Shell large, heavy, acute, the later whorls rapidly enlarging; the young as in 
Subula, the sulcus not persistent in the adult, which has the later whorls smooth. 
Type Terebra maculata Lamarck. 
This is Acus Gray, 1847, not of Edwards, 1771. 
Subgenus (and section) Acumiwta Dall. 
Young with flat axially regularly ribbed whorls, blunt at the suture without 
Sutural band or sulcus, shell slender, many whorled, the adult smooth, the colu- 
mellar lip bare, with no canal, but a deep siphonal suleus. Type Zerebra lanceata 
(Linné). 
This section of Subula is remarkable for the total absence of the presutural 
sulcus. 
HASTULA Apans. 
Subgenus Hastura H. and A. Adams, 1853. 
Shell small and slender, the sculpture similar in young and old; no presutural 
band or suleus, no canal, suture appressed, sculpture of fine axial wrinkles and 
feeble spiral striae, whorls flattish, spire acute, columellar lip with a thin callus, 
the posterior angle of the aperture channelled; colors usually dark and lurid. 
Type Terebra strigillata Lamarck. 
This is a widely distributed group of peculiar sculpture and coloration, repre- 
Sented by closely similar species in nearly all the tropical seas. 
