236 MAZATLAfT UNIVALVES 



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

 ment of Calyptrseid. 

 Tablet 1144 contains 4 opercula. 



294. OMPHALIUS GLOBULUS, n. s. 



O. t. parvd, globulosd, compactd, subconicd ; anfractibus v. et 

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

 tenue lirati ; liris sublcBvibus, interstitiis latis peripherid haud 

 angulatd; umbilico hand magno, spiraliter ascendente ; callosi- 

 tate parietali haud conspicud, ah axi sub dist ante ; regione urn- 

 bilicali subconcavo, liris spiralibusfortioribus ; columelld tuber' 

 culo magno et callositate basali plus minusve distinctd munitd, 

 prope eas profunde insculptd; labro intus haud calloso ; sub 

 epidermide tejiui, Iceviori, pallide purpureo-cinered, punctis et 

 maculis purpureis pictd. 

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



no. 35 : non Phil, in Kust. Mart. pi. 14, f. 15 (non 17 ; = 



Clanculus g. H. fy 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. ligulatus always borders on the spiral columellar 

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

 size of the umbilicus varies slightly. Long. '3, lot. '33, div.SOP. 

 Hob. Mazatlan ; 5 sp. only ; L'pool Col. 



Tablet 1145 contains the most characteristic specimen. 



GENUS YITEESTELLA, C. B. Ad. 



Testa Margarita, Cyclostremati seu Adeorbi forma simulans ; 

 minima, albida, subdiaphana, tennis? plerumgue subhyalina ; 

 superficie inter dum Icevi, plerumque sculpturd varie ornatd ; 

 anfractibus paucis, quorum plures sculptures desunt, normales 

 i-ii., rapide augentibus ; umbilico maximo. 

 Mon. Vitr. 1850 -.Pan. Shells, p. 184 : (pars.) Phil. Sandb. 



Conch, p. 207. H. fy A. Ad. G-en. vol. i. p. 434. (Non Gray, 



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



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

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



