MAZATLAN UNIVALVES 397 



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

 measures long. "42, long. spir. 22, lat. "lO, div. 30°— 40". 



Mr. Cuming's sp. „ 1-08, „ 'U, „ -39, „ 30". 

 iZaS.— Mazatlan ; 1 fresh adolescent sp. ; L'pool Col. 

 Tablet 1900 contains the specimen. 



466. Deillia albonodosa, n. s. 



D. t. turrita, nigra, gracili ; epidermide tenui, Icevi, fmcd,. 

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

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

 pherlali ornatCi ; aliter sublcevi, striis distantibus et striuUs 

 confertis minimis spiralibus vix ornatd ; ared infrasuturali 

 liaud excavatd ; aperturd subovaU ; labro acuta, vix serrato ; 

 sinu postico profunda, parvo, rotundato, constricto ; supra, intux 

 siduram, callosd ; labia parvo, Icevi. 



This species resembles Clavatula cselata and CI. 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. 'VI, div. 30". 

 JTai.— Mazatlan ; 2 sp. and fragments : L'pool Col. 



Tablet 1901 contains a perfect specimen. 



467. Deillia LtrcTtrosA, Kinds. 



Clavatula luctuosa. Hinds, Prac. Zool. Soc 1843, p. 4D :—Vui/. 



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

 Pleurotoma luctuosa, Rve. Conch. Ic. pi. 18, sp. 149. 

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

 Non PI. luctuosa, jyOrb. 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. nidis) descends and rises again at the mouth, making 

 the spire-outhnes curvilinear. The first three whirls are smooth. 

 Surface with extremely fine lines of growth, faintly decussated 

 bj^ spiral striulse. Labrum 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 incrusted. 



Nov. 1856. U 



