MAZATLAN UNIVALVES 397" 



shell up to the light. The Mazatlan specimen, young state, 

 measures long. '42, long. spir. '22, lat. '19, div. 30 40. 



Mr. Cuming'ssp. 1'08, '64, '39, 30. 

 Hab. Mazatlan ; 1 fresh adolescent sp. ; Lpool Col. 

 Tablet 1900 contains the specimen. 



466. DKILLIA ALBONODOSA, n. s. 



D. t. turritd, nigrd, gracili ; epidermide tenui, Icevi, fused, 

 indutd ; anfr. iii. nucleosis, vii. normalibus, parum excurvatis ; 

 tuberculis valde extantibus, circiter viii. acutioribus, serie peri- 

 pJieriali ornata ; aliter sublcsvi, striis distantibus et striulu 

 confertis minimis spiralibus vix ornata; area infrasuturali 

 haud excavatd ; aperturd subovali ; labro acuto, vix serrato ; 

 sinu postico profundo, parvo, rotundato, constricto ; supra, intu,f 

 suturam, callosd ; labio parvo, Icevi. 



This species resembles Clavatula cselata 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. DEILLIA LUCTUOSA, Hinds. 



Clavatula luctuosa, Hinds, Proc. Zool. Soc 1843, p. 4D : Voy. 



Swlph. Moll. p. 18, no. 58, pi. 6, f. 4. 

 Pleurotorna luctuosa, Hve. Conch. Ic. pi. 18, sp. 149. 

 Crassispira (Drillia) luctuosa, H. fy A. Ad. Gen. i. 91. 

 Non PI. 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 spire-outlines curvilinear. The first three whirls are smooth. 

 Surface with extremely fine lines of growth, faintly decussated 

 by spiral striulse. Lab rum sharp, not serrated, with a swelling 

 behind ; anterior sinus very distinct, as in Strombus ; pos- 

 terior notch deep; sutural callosity large, joining the well- 

 developed labium. Operculum shaped as in D. maculosa, 

 with more or less of a reddish tinge. Spire generally incrustecL 

 Nov. 1856. II 



