384. MAZATLAN UNIVALVES 
Susorper TOXIFERA. 
Famity TEREBRIDA. 
Genus TEREBRA, Adanson. 
Terebra, Adans. pars.—Eyes at the outer bases of the tentacles. 
Suscenus MYURELLA, Hinds. 
HI. § A. Ad. Gen. vol.i. p. 227.—Whirls with a tuberculated 
zone. 
450. MYURELLA ALBOCINCTA, 2. S. 
M. t. conico-subulatad, acuminaté, turrité ; fusco-purpured 
seu olivaced ; anfr. planulatis, superne cingulo tuberculato, 
albo, interrupteé fusco picto ; infra costis transversis, tuberculis 
haud semper convenientibus, haud extantibus, obtusis ; lineis im- 
pressis spiralibus, plerumque iv.—vi., interdum costis decussan- 
tibus ; superficie tota spiraliter exillime striata, striis undulatis, 
urregularibus ; anfr. ultimo cingulo albido suture antecedente ; 
apertura obovali, labro, acuto, vix sinuato, labio tenuissimo ; 
canalt brevi, contorta, alte emarginatd ; carind acutd spiraliter 
ascendente, columellam vix plicante: opere. parvo, diaphano, 
aureo, rhombico, diagonaliter depresso, apice acuto, marginibus 
rectis, termino convexo. 
=Terebra armillata, MWhe. in Zeit. f. Mal. 1851, p. 34, no. 118, 
(non Hinds.) 
Comp. T. variegata, Whe. loc. cit. no. 117, (Pnon Gray.) 
Following as I thought the judgment of Dr. Menke, I have 
freely distributed this shell as T. variegata. According to the 
types however, that species is distinct ; it is not uncommon on 
the coast, but was entirely absent from the Mazatlan collection. 
The shell so named in Dr. Menke’s mixed list may be the true 
T. variegata, imported, or one of the species now deseribed. 
The present species is so closely related to T. armillata, Hinds, 
(teste types in Mus. Cum.) that there can scarcely be a doubt 
that it is the shell brought by Melchers. It even more closely 
resembles the Gambia species, T’. intertincta, Hinds ;* from 
* ?Should not T. Africana, Gray, in Griff. Cuv. pl. 23, ¥.5, be referred to this 
species rather than to T. variegata. The shell figured by Kien. Icon. Conch. 
p. 114, no. 10, pl. 2, f. 3, seems exactly to represent the T. variegata of the Gulf 
of Califorma; which differs from T. albocincta in being much larger, broader, 
not olivaceous, with sutural band broader and flatter in proportion, with the 
radiating coste in the lower whirls nearly obsolete, and the base more rounded. 
