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Bulla [Tornatina] cerealis. T. parva, ovoideo-fusiformis, soli- 

 dula, eburnea, levigata ; spira exserta, tabulata, rnamillata ; anfr. 4 : 

 apertura angusta, antrorsum dilatata, labro ad medium saliente, pos- 

 tice sensim approximante, et ante suturam coadunato ; columella cal- 

 losa, plica valid;! Instructs. Axis, ^ ; diam. ^ poll. Inhabits Santa 

 Barbara. Col. Jeicett. 



In form and size it is scarcely to be distinguished from B. gracilis 

 A. Ad., which is transversely striated. In terms, it agrees with B. 

 infrequens C. B. Ad., but Prof. Adams himself considered it a different 

 species. 



Physa elata. T. tenuissima, ovato-lanceolata, levigata, nitida, 

 dilute cornea, ad suturam decolorata : spira acuta, anfr. 6 convexius- 

 culis, ultimo J longitudinis testa? equante, antice angustato : apertura 

 angustata § long, testas adequans; columella vix plicata. Axis £; 

 diam. § poll. ; aperturse long. | poll. Inhabits Lower California. Maj. 

 Rich. 



Almost as slender as P. hypnorum, though much larger, highly pol- 

 ished, and with a very long aperture. 



Sigaretus debilis. T. parva, tenuis, lucida, depressa, niellea, 

 striis numerosissimis obtusis volventibus, supernis majoribus, insculpta ; 

 spira superficiei generali congruens ; anfr. duobus ; apice ad quadran- 

 tem diametris sito ; angulo ad peripheriam obtuso, versus aperturam 

 sensim evanido ; labio antice dilatato. Long. I ; lat. £ ; alt. \ poll. 

 Inhabits La Paz, Gulf of California. Lieut. Green. 



It has the form of S. haliotideus, the size of S. planus, and is smooth 

 like S. levigatus. 



Narica [Isapis] ovoidea. T. ovoidea, solida, albida, costis planu- 

 latis politis ad 11 cincta, interspatiis duplo angustioribus concinne 

 clathratis ; spira, acuta, anfr. 4 superne tabulatis, ultimo magno, ovato : 

 apertura ovata ; labro crenulato ; columella tenui, antrorsum concavii, 

 plica, mediana, instruct;!; umbilico conspicuo, profundo. Long, v^; 

 lat. ^ poll. Purchased at Mazatlan. Col. Jewett. 



Terebra arguta [is T.fulgurata Phil.]. 



Trochus marcidus. T. pyramidalis, sohdula, vlx striata, rufo- 

 viridis ; anfr. 5 planulatis ad suturam vix discretis : basis subplana, 

 levis, umbilico amplo profundo infundibuliformi, juxta aperturam 

 partim tecto : apertura subrhombea, perobliqua : operculum tenue. 

 Axis I ; diam. 1 J poll. Inhabits Monterey. Lieut. Green. 



Like T. Montereyi Kiener, but the base is plain, the umbilicus broad 

 tunnel-shaped. It also resembles Chlorostoma maculatum A. Ad. 



Trochus [Livona] picoides. [ResembUng T. (Livona) pica ; but 

 I have seen no reason as yet to change my opinion that it is distinct 



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