462 MAZATLAtf UNIVALVES 



minent and two less prominent folds, and sometimes a fifth 

 slightly developed. Labrum smooth. The spire, which is 

 slightly elevated, has its whirls concealed by the parietal callus, 

 but there are either 4 or 5 in the adult. The youngest sp. 

 measures '025, by '016; the largest adult, long. '085, long, 

 spir. '015, lat. '054, div. 120. 



Sab. Panama, 10 sp. C. B. Adams. Mazatlan ; not uncom- 

 mon on Qhania, SpQndylus, and Modiola capax ; ISpool Col. 



Tablet 2107 contains 7 young, and 3 adult sp., varying in 

 outline. 



588. MAROINELLA POLITA, n. s. 



Ml, t. "AT. minore" simili ; sed minore, regulariter ovatd, 

 antice vix product a, spir a rotundatd, hand extante ; callo parie- 

 tali minore : plicis iv. subcequalihus, conspicuis*. 



This species is regularly elliptical, with the foci near. The 

 specimens found may not be mature, though they appear 

 normally formed. They do not accord with the young of the 

 last species, which, though it varies somewhat, gives no signs 

 of assuming the form of this. The shell is extremely glossy. 

 Long. '034, long. spir. '002, lat. '022, div. 150. 

 Sab. Mazatlan ; 6 sp. off Chama and Spondylus ; Epool Col. 



Tablet 2108 contains the smallest and largest sp. and one 

 somewhat aberrant. 



^ 589. MAEGINELLA MAEGAEITULA, n. s. 



M. t. parvd, alba, politd ; interdum striulis incrementi kaud 

 conspicuis ; ovatd, antice et postice kaud angustd ; spir a, t. juni- 

 ore et adultd, omnino celatd ; aperturd elongatd, angustd, spires 

 superante ; labro t. juniore acuto, adultd ut in Cyprced incur- 

 vato, dentato ; postice canaliculato* callositate parietali munito ; 

 plicis iv. distinctis, posticis in adultd undatis, basalibus majori- 

 bus ; interdum denticulis parietalibus minimis ; latio parietali 

 nullo. 



Comp. Marginella ovuliforinis, D'Orl. B. M. Cat. Cub. Moll. 

 p. 24, no. 281. 



This little species partakes of the characters of Persicula, 

 and is extremely like the W. Indian P. clandestina : from 

 which it differs (if rightly placed by Messrs. Adams among 



