384 MAZATLAN tJNIVALVEg 



SuBOEDEB TOXIFERA. 



Family TEEEBRID^. 



Genus TEEEBRA, Adansm. 



Terebra, Adans. pars. — Eyes at tlie outer bases of tlie tentacles. 



Subgenus MYUEELLA, Hinds. 



H. Sf A. Ad. Gen. vol. i. p. 227.— WMrls witk a tuberculated 

 zone. 



450. MyUEELLA AIBOCINCTA, n. s. 



M. t. conico-subulata, acuminata, turritd ; fusco-purpure& 

 seu olivacea ; anfr. planulatis, superne cingtilo tubereulato, 

 albo, interrwpte fusco picto ; infra costis transversis, tuherculis 

 hand semper convenientibus, hand extantibiis, obtusis ; lineis im- 

 pressis spiralibus, plerumque iv. — ri., interdum costis decussan- 

 tibus ; superficie totd spiraliter exillime striata, striis undulatis, 

 irregularibus ; anfr. ultimo cingulo albido suturw antecedente ; 

 aperturd obovali, labro acuto, vix sinuafo, labio tenuissimo ; 

 canali brevi, contortd, alte emarginatd ; carina acutd spiraliter 

 ascendente, columellam vix plicante : operc. parvo, diaphano, 

 aureo, rhomhico, diagonaliter depresso, apice acuto, marginibus 

 rectis, termino convexo. 

 = Terebra armillata, Wee. in Zeit.f. Mai. 1851, p. 34, no. 118, 



(non Hinds.) 

 Comp. T. variegata, J/X<?. loc. cit. no. 117, (?uon G-ray.) 



Following as I thought the j udgment 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 described. 

 The present species is so closely related to T. armdlata. 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. intertLncta, Hinds;* from 



• ? Should not T. Africana, Gra;/, in O-riff. Citv. pi. 23, f. 5, be referred to this 

 species rather than to T. variegata. The shell figured by Kien. Icon. Conch, 

 p. 114, no. 10, pi. 2, f. 3, seems eiactly to represent the T."variegata of the Gulf 

 of California ; which differs from T. albocincta in being much larger, broader, 

 not olivaceous, with sutural band broader and flatter in proportion, with th« 

 radiating cost® in the lower whirls nearly obsolete, and the oase more rounded. 



