dy MAZATLAN UNIVALVES 



with blackish niud, sometimes bearing round flat egg-cases, 

 pierced in the middle. Long. '61, long. spir. "32, lot. "25, 

 div. (anfr. sup.) 40. 



Hab\ Bay of Guayaquil; Gulf of Magdalena, California, 

 5 22 fm. ; Hinds. Mazatlan ; not uncommon ; L'pool fy 

 Havre Coll. 

 Tablet 1902 contains 5 sp. immature. 1903, 6 sp. adult. 



1904, 2 sp. mended after fracture. 1905, 1 sp. with eg^-cases. 



1906, 1 sp. with operculum ; also 2 separate opercula, one 



normal, the other with sub-central nucleus. 



468, ?DEILLIA HANLETI, n. s. 



?D. t. subacuminatd, nigrd, epidermide tenui nigro-cinered, 

 indutd ; anfr. ?xi. subplanatis ; canali infrasutwrali angusto 

 et totd superficie tenuissime spiraliter striatis ; carind parum 

 prominente juxta suturam ; costulis radiantibus concinnis, valde 

 acutis, circiter xv. vix declivibus ; aperturd nigrd ; t. adolescente 

 sinu parvo ; t. adultd ? 



Somewhat resembles the young of D. luctuosa, but is known 

 by the fine costse, continued nearly to the base and the infrasu- 

 tural keel. It has some points in common with Defrancia 

 cselata, Hinds, but its analogies seem to be with D. aterrima, 

 &c. The only specimen found (which has its upper whirls 

 smooth) is not quite mature, and measures long. '38, long, 

 spir. '24, lat. '15, div. 32. 

 Hab. Mazatlan ; 1 fresh sp., L'pool CoL 

 Tablet 1907,contains the specimen. 



469. DEILLIA , sp. ind. 



Tablet 1908 contains a shell, too much rubbed-for description, 

 and a spiral fragment which may be conspecific ; reddish 

 brown, with a white spiral band. It closely resembles a W. 

 Indian species. Shell with 6 normal whirls, and a rounded 

 vertex of 3 smooth whirls. Long. '35, lat. '14. 

 Hob Mazatlan ; extremely rare, off Spondjdus ; L'pool Col. 



470. DEILLIA - , sp. ind, 



Tablet 1909 coi; tains a specimen, too much worn for des- 

 cription, of a small turrited species of about 7 whirls, measuring 



