248 bulletin: museum of comparative zoology. 



DuPLiCARiA Dall {Mi/urella 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 fascicle and its posterior keel obsolete. Soft parts un- 

 known. Type Terebra var. spinulosa Doderlein. Fossil of the Tortoniau of Italy. 



These genera are subdivisible on the basis of the shell, as far as now known, 

 and the following groups seem recognizable. 



T£REBRA BRUGUiiaE. 



Subgenus (and section). Strioterebrum 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 T. basteroti Nyst. 



A recent species is T. 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 terehrma Bonelli, Miocene. 



A recent species of this group is Terebra benthalis Dall, West Indies. 



Section Perirhoe Dall. 



Like Strioterebrum, but with the axial sculpture obsolete or absent and the 

 spiral emphasized. Type Terebra circumcincta Deshayes. Jcus rushii Dall is an 

 American species. 



Section Triplostephanus 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 triseriala Gray. 



This group was included by Hiuds 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 Trij)- 

 lostcphauus 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 s. s. 



Young with the sculpture of Triplostephanus. Shell slender with many whorls, 

 the inner lip not callous, the sulcus and sutnral band obsolete or absent, and the 

 surface of the whorls smooth in the adult. Type T. subulata (L.) Lamarck. 



