386 MAZATLAN 5 UNIVALVES 



specific or only of sectional value (as will be learnt by induction 

 from more numerous specimens,) it bears the honoured name 

 of the author of the Synopsis of this genus in the Proc. ZooL 

 Soc. 1843, pp. 159 et seq. Long. 1' 24,, long. spir. *98, lat.'27, 

 div. 13. 



Hob. Mazatlan ; 6 specimens, dead ; L'pool Col. 

 Tablet 1836 contains 2 specimens, with extremes of sculpture. 



452. MYUEELLA SUBNODOSA, ? n. s. 



M. t. " M. albocinctce" forma et indole simili ; sed rufo-fuscd, 

 albido tinctd ; sublcevi, lirulis radiantibus et striulis extantibus 

 paucis spiralibus vix ornatd ; superficie hand striatd ; peri- 

 pherid subangulata, subnodosd ; columella carind vix extante, 

 haud plicatd. 



Two specimens were found, agreeing in shape exactly with 

 T. albocincta, but with the faint spiral sculpture raised instead 

 of indented, the surface destitute of microscopic striulse, the 

 periphery subnodulous, and the keel surmounting the canal 

 very faint. Long. I "22, long. spir. 1', lat. "36, div. 18. 

 ILalj. Mazatlan ; extremely rare ; L'pool Col. 



Tablet 1837 contains the large specimen, with the spire bent 

 through fracture. 



453. MYUEELLA EUFOCINEBEA, ?n. s. 



M. t. "M. Hindsii" forma et indole simili ; sed omnino rufo- 

 cinered, haud maculatd ; cingulo latiore, pdllidiore, margine im- 

 presso, tuberculos confertiores angustos, magis elongatos gerente ; 

 costis radianlibus acutis expressis, tuberoulis lineis vix undatis 

 convenientibus ; fascia circa peripJieriam valde rotundatam 

 pallidiore ; columella a carind super canalem plicatd , anfrac- 

 tibus subconvexis, lineis spiralibus, haud sculpturd microscopicd, 

 ornalis. 



In shape agreeing with M. Hindsii ; but with inarkings more 

 like those of M. albocincta, yet destitute of minute sculpture ; 

 with the costse much more developed, and the sublinear tuber- 

 cles in a less waved line of junction. The cincture is marked 

 off by a deep suture. This, and the more rapid rounding of 

 the base, give the whirls a slightly convex appearance. One 

 fresh, beautifully tinted specimen was found ; and a spiral 



