330 MAZATLAW UNIVALVES 



regarded by many competent conchologists as part of a gigantic 

 Caecum, and is the "? Caecum, no. 9" of my ms. catalogue. I 

 doubt whether any of these objects be of Molluscous origin. 



FAMILY TUBKITELLDLE. 



GENUS TUERITELLA, Lam. 

 H. $ A. Ad. Gen. vol. i. p. 351. Phil. Handb. Conch, p. 164. 



379. TUEEITELLA GONIOSTOMA, Vol. 



Turritella gonostoma, Vol. Eec. Obs. ffumb. vol. ii, p. 275. 

 T. goniostoma, Kien. Icon. Conch, p. 21, no. 16, pi. 10, f. 1, 



(bene). Seba, Mus. vol. in. pi. 56, f. 26. live. Conch. Ic. 



pi. 3, sp. 10, f. 10, a, 1. Mice, in Zeit.f. Mai. 1850, p. 165, 



no. 11. 



Haustator (Turritella) goniostoma, H. fy A. Ad. Gen. i. 352. 

 + Turritella lentiginosa, live. loc. cit. pi. 3, sp. 9, (Payta, 



coarse sand, about 5 fm. Cuming) H. fy A. Ad. Gen. i. 351. 

 P 4- T. Hookeri, Mke. loc. cit. no. 12 : non Eve. loc. cit. pi. 11, 



sp. 61, (Antarctic Seas, Capt. Ross.) 

 Comp. T. Banksii, Eve. loc. cit. pi. 4, sp. 15. C. B. Ad. Pan, 



Shells, p. 160, no. 210. = Haustator B. H. $ A. Ad. Gen. i. 



352. 

 = T. Broderipiana, D'Orb. B. M. Cat. Moll. p. 31, no. 279. 



" = T. California, 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, Eve. (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 T. 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 striae) 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, 



