MAZATLAN UNIVALVES 519 
665. MuREx ? RECURVIROSTRIS, va. LIVIDUS. 
Murex recurvirostris, Brod. in Proc. Zool. Soc. 1832, p. 174.— 
Miill. Syn. Nov. Test. Viv. p. 92.—Rve. Conch. Ie. pl. 19, 
f. 75.—C. B. Ad. Pan. Shells, p. 124, no. 140. 
Murex recurvirostrum, Sow. Conch. Zl. pl. 59, f. 9, no. 13. 
Murex messorius, Mike. in Zeit. f. Mal. 1850, p. 186, no. 65. 
(Non Sow. Proc. Zool. Soc. 1840, p. 137 ;—Conch. Lil. no. 9, 
f. 93.—Kien. Icon. Conch. p.9, no. 5, pl. 10, f.2.—Desh. in 
Lam. An. s. Vert. vol. ix. p. 602, no. 69.—Rve. Conch. Ic. 
sp. 90.) 
Comp. M. nigrescens, Sow. P. Z. S. loc. cit.: — Conch. Lil. 
no. 12, f. 113.—Rve. loc. cit. sp. 92. (Xipixapi, Cuming.— 
=M. messorius, var. teste Aven. non Desh.) 
Comp. M. rectirostris, Sow. P. Z. S. p. 138 :—(M. rectirostrum,) 
Conch. Ill. no. 11, f. 111.—Rve. loe. cit. sp. 91—C. B. Ad. 
loc. cit. no. 139. (Xipixapi, Cuming.—=M. messorius, var. 
teste Kien. non Desh.) 
Comp. M. funiculatus, ve. loc. cit. sp. 74. 
M. ?recurvirostris t. lividd, fusco-aurantio supra liras cincta ; 
spird depressé seu subelevatd : costis intervaricalibus il. seu iil., 
ultimis sepe obsoletis ; liris spiralibus, varices transeuntibus ; 
varicibus iil. plus minusve conspicuis, rotundatis, postice inden- 
tatis ; varice ultimo spind unicd suturam versus plus minusve con- 
spicuo, spinulis canalem versus minimis, antice 
declivibus, incanali uno, haud hamato ; varicibus penul- 
timis sepe spinis li. rarius iii. in canalt, spinis parvis anticis 
medianis ; anfr. iv. primis abnormalibus, quorum primus 
declivis, in adult& semper decollatus, proximus levis, proxime 
cancellati; labro extante, crenato; labio extante ; tuberculis 
intus in labro, sepius in labio quoque minoribus, ornatd ; canale 
interdum recto, interdum plus minusve recurvato ; operculo 
tenuiore, margine acuto, rubro-fusco; extus rugis inerementi, 
intus nitente ; cicatr. muse. normaliter rugulis paucis incrementt, 
interdum corrugatd ; ovatd, nucleo terminal. 
The Mazatlan specimens, (of which I have carefully examined 
about 300) are referred by Menke to M. messorius, by Mr. 
‘Cuming doubtfully to M. nigrescens, by Mr. Hanley to M. 
recurvirostris. If the species above cited are all distinct, the 
Mazatlan form may be distinct also; but probably the ex- 
amination of other local forms may prove some of them to be 
identical. That the Mazatlan specimens are of one species, I 
