236 MAZATlASr UNIVALVES 



with Bryozoa and Annelids attached. — 1143, 1 sp. with attach- 

 ment of Calyptra;id. 

 Tablet 1144 contains 4 opercula. 



294. Omphalitis globulus, n. s. 



O. t. parvd, glohulosa, compactd, suhconicd ; anfractihus v. et 

 dimidium, quorum ii. et dim. primi sublcuves, alteri spiraliter 

 tsnue lirati ; liris suhlcevihus, interstitiis latis ; peripheria haud 

 angulata ; icmbillco haud magno, spiraliter ascendente ; callosi- 

 tate parietali hmcd conspiciid, ah axi suhdistante ; regione urn- 

 hilicali suhconcavo, liris spiralihusfortiorihus ; columella tuber- 

 culo magno et callositate basali plus minusve distinctd munitd, 

 props eas profunde insculptd ; labro intus haud calloso ; sub 

 epidermide tenui, l(cviori, pallide purpureo-cinered, punctis et 

 maculis purpureis 2nctd. 



Comp. Trochus glomus, Mkc. in Zeit. f. Mai. 1850, p. 173, 

 no. 35: non Phil, in Kust. Mart. pi. 14, f. 15 (nonl7; = 

 Clanculus g. H. ^ A. Ad. Gen. i. 416,) 



This shell is much more elevated and compact than the 

 young of even the most conical variety of O. ligulatus ; in 

 sculpture and umbilicus more resembling O. viridulus. Its 

 characteristic features however are the absence of the tubercle 

 which in O. ligulatxis always borders on the spiral columellar 

 callosity, and the deep channeling of the adjacent area. The 

 size of the umbilicus vai'ies slightly. Lung."i, lat. "33, div.SCP. 

 Sab. — Mazatlan ; 5 sp. only ; Upool Col. 



Tablet 1145 contains the most characteristic specimen. 



Genus VITEINELLA, C. B. Ad. 



Testa Margarita;, Cyclostremati seu Adeorbiformd simulans ; 

 minima, albida, subdiaphana, tenuis, plerumque subhyalina ; 

 superjicie interdum Icevi, plerumque sculpturd varie ornatd ; 

 anfractibus paucis, quorum plures sculptura; desunt, normales 

 i-ii., rapide augeniihus ; umbilico maxima. 

 Mon. Vitr. 18B0:— Pan. Shells, p. 184: (pars.)— P///Z. Sandb. 



Conch, p. 201.-11. Sf A. Ad. Gen. vol. i. p. 4^4.— (Non Graij, 



B. M. Cat. Ptilm. p. 65, 1855.) 



This genus, constituted by Prof. Adams for 5 species from 

 Jamaica, (of wliich one, V. megastoma, is an Ethalia,) and 



