MAZATLAN UNIVALVES 397 
shell up to the light. The Mazatlan specimen, young state, 
measures long. ‘42, long. spir. °22, lat. °49, div. 30°—40°. 
Mr. Cuming’s sp. ,, 1°08, a Gs oes 9 SE} Meme 
Hab.—Mazatlan ; 1 fresh adolescent sp.; L’pool Col. 
Tablet 1900 contains the specimen. 
466. DRILLIA ALBONODOSA, %. S. 
D. t. turrité, nigra, gracili ; epidermide tenui, levi, fused, 
indutd ; anfr. ii. nucleosis, vil. normalibus, parum excurvatis ; 
tuberculis valde extantibus, circiter vil. acutioribus, serie peri- 
pheriali ornatéd ; aliter sublevi, striis distantibus et striulis 
confertis minimis spiralibus vix ornatéi; ared infrasuturali 
haud excavatd ; apertura subovali ; labro acuto, vix serrato ; 
sinu postico profundo, parvo, rotundato, constricto ; supra, intus 
suturam, callosé ; labio parvo, levi. 
This species resembles Clavatula celata and Cl. micans, 
Hinds, and also a species from Honduras. The sculpture is 
extremely faint, except the strong row of tubercles. Long. ‘51, 
long. spir. 28, lat. °17, div. 30°. 
Hab.—Mazatlan ; 2 sp. and fragments: L’pool Col. 
Tablet 1901 contains a perfect specimen. 
467. DRiLtia Luctuosa, Hinds. 
Clavatula luctuosa, Hinds, Proc. Zool. Soe 1843, p. 40 :—Voy. © 
Sulph. Moll. p. 18, no. 58, pl. 6, f. 4. 
Pleurotoma luctuosa, Rve. Conch. Ic. pl. 18, sp. 149. 
Crassispira (Drillia) luctuosa, H. & A. Ad. Gen. i. 91. 
Non Pl. luctuosa, D’ Orb. B. M. Cat. Cub. Moll. p. 31, no. 370. 
This unpretending little species is easily recognized by its 
black colour and faint sculpture. A row of small tubercles 
ascends the spire, scarcely discernible on the last whirl, which 
(as in D. rudis) descends and rises again at the mouth, making 
the spive-outlines curvilinear. The first three whirls are smooth. 
Surface withextremely fine lines of growth, faintly decussated 
by spiral striule. Labrum sharp, not serrated, with a swelling 
behind; anterior sinus very distinct, as in Strombus; pos- 
terior notch deep; sutural ecallosity large, joining the well- 
developed labium. Operculum shaped as in D. maculosa, 
with more or less of areddish tinge. Spire generally incrusted 
Nov, 1856. ll 
‘ 3 
