MAZATLAN UNIVALVES 1B; 
Suscenus STROMBINA. 
To which group of Columbellide these shells are most allied, 
has not yet been determined. They are ranked provisionally 
under Anachis. 
657. STROMBINA MACULOSA, Sow. 
Columbella maculosa, Sow. in Proc. Zool. Soc. 1832, p. 115:— 
Thes. Conch. p. 139, no. 84, pl. 40, f. 152.— Desh. in Lam. 
An. s. Vert. vol. x. p. 291, no, 46.—Chénu, Conch. Ill. pl. 12, 
f.78, 
- Strombina maculosa, H. & A. Ad. Gen. i. 186. 
This shell is like an elongated A. coronata, being similarly 
painted, and having the upper whirls smooth, and the lower 
ones tuberculated. The second row of tubercles is scarcely 
indicated in the smaller (adult) specimen, while the larger one 
is entirely destitute of them. Base spirally striated. The 
largest sp. measures long. 1°02, long. spir.*6, lat.°32, div. 26°. 
Hab.—Guacomayo, in sandy mud, Cuming.—Mazatlan ; 2 dead 
specimens ; L’pool Col. 
Bane 2436 contains the smaller (more perfect) specimen. 
658. P Srrompina ~-—— —, sp. ind. 
Tablet 2437 contains a young shell, very elongate, with 3 
smooth nuclear whirls; also a fragment of an adult; surface 
with deep irregular pits, ee ‘by the confluence of spiral 
and radiating ridges. 
Hah.—Mazatlan ; extremely rare, off Spondylus; L’pool Col. 
Genus PISANIA, Biv. 
‘Biwon. Nuov. Gen. 1832, p.18:—Phil. Handb. Conch. p. 149, 
no. 21:—H. & A. Ad. Gen. vol. i. p. 88.= Puisio, Gray. 
+ Pollia, Gray, Zool. Beech. Voy. 1839, p. 111 :—P2il. loc. cit. 
p. 148, no, 20:—=Cantharus (Bolt.) H. § A. Ad. Gen. vol... 
p. 84, 
