va MAZATLAN UNIVALVES 
regarded by many competent conchologists as part of a giganti¢ 
Cxecum, and is the “?Caecum, no. 9” of my ms. catalogue. I 
doubt whether any of these objects be of Molluscous origin: 
Famity TURRITELLIDA. 
Genus TURRITELLA, Lam. 
Hf. § A. Ad. Gen. vol.i. p. 351.—Phil. Handb. Conch. p. 164. 
379. TURRITELLA GONIOSTOMA, Val. 
Turritella gonostoma, Val. Rec. Obs. Humb. vol. ii. p. 275.1 > © 
T. goniostoma, Kien. Icon. Conch. p. 21, no. 16, pl. 10, f. 1, 
(bene).—Seba, Mus. vol. ii. pl. 56, f.26.—Rve. Conch. Ie. 
pl. 3, sp. 10, f. 10, a, b—Mzke. in Zeit. f. Mal. 1850, p. 165, 
novi. 
Haustator (Turritella) goniostoma, H. & A. Ad. Gen. i. 352. 
+ Turritella lentiginosa, Ave. loc. cit. pl. 3, sp. 9, (Payta, 
coarse sand, about 5 fm. Cuming)—H. & A. Ad. Gen. i. 351. 
?+T. Hookeri, Wke. loc. cit. no. 12:—non &ve. loc. cit. pl. 11, 
sp. 61, (Antarctic Seas, Capt. Ross.) 
Comp. T. Banksii, ve. loc. cit. pl. 4, sp. 15.—C. B. Ad. Pan, 
Shells, p. 160, no. 210.—=Haustator B. H. § A. Ad. Gen. i. 
302. 
=T. Broderipiana, D’ Orb. B. Wf. Cat. Moll. p. 31, no. 279. 
“=. Californica, Brod. [!] Pyoung.” 
This species was first described from a small shell, an inch 
long, with 12 turns of spire, brought from Acapulco by Hum. 
boldt & Bonpland. Its W. Indian analogue is Turritella 
meta, Rve. (v. Phil. in Kust. in loco.) The form distin- 
guished as T. lentiginosa, having the colouring ‘‘in short, 
transverse, linear dashings” is not so aberrant as many here 
catalogued. The B. Banksii has rather a more delicate style 
of sculpture, but is not improbably only a variety of the same 
species. Of the changes of colour and pattern, a sketch is 
given in the list below. In shape, it is either nearly smooth 
(except spiral strie) with flattened whirls ; or with the whirls 
moderately swelling ; or, more usually, with an obtuse keel on 
the shoulder, and a few others below. The base is always 
ribbed, and the periphery more or less sharply keeled. It is 
common to find shells beginning with one form and pattern, 
