360 MAZATLAN UNIVALVES 



414. ALVANIA TUMIDA, n. s, 



A. t. ventricosd, albo-fusca, solidd ; anfr. v. tumentibus, 

 subaqualiter cancellatis ; costis kaud obtusis mrcit&r xxii. trans- 

 versiSj a liris spiralibus interse^tis, nodosis ; liris vii., quarum 

 iii. spiram transennt, una umbilicum satis magnum definat ; 

 interstitiis quadratis ; aperturd subrotundatd, labro varicoso, 

 labio tenuiore. 



Differs from all varieties of A. excurvata in its very tumid 

 growth., umbilicated base, and thickened lip. Long. '057, 

 long. spir. '034, lat. '033, div. 40. 

 Hab. -Mazatlan ; 2 dead sp. off Spondylus ; L'pool Col. 



Tablet 1711 contains one specimen. 



415. ?ALVANIA , sp, ind. 



Tablet 1712 contains a white, rather solid shell, with very 

 tnmid whirls and a ronnd month. It might pass for a Scalaria, 

 bnt has no ribs ; or for an Aclis, bnt the apex is dextral. One 

 whirl has perished ; the remaining seven measure long. '048, 

 long. spir. '03, lat. '027, dvo. 30. 

 Sab. Mazatlan ; 1 sp. off Chama ; L'pool Col. 



GENUS CINGULA, Flem. 

 H. fy A. Ad. Gen. vol. i. p. 334. Cingnla, pars, C. B. Ad. 



416. PCiNGULA , sp. ind. 



Tablet 1713 contains a short, broad, white, smooth, rather 

 solid shell, with flattened whirls, of Odostomoid appearance ; 

 but the apex appears dextral. The peritreme is continuous 

 and not plaited. It has five whirls, and measures long. '053, 

 long. spir. '03, lat. '033, div. 43. 

 Hab Mazatlan ; 1 sp, off Chama ; L'pool Col. 



* 



GENUS HYDEOBIA, Hartm. 



Sturm, DeutscL Faun. vi. 5, p. 47, IS21.PMI. Hand. Conch. 



p. 168. H. $ A. Ad. Gen. vol. i. p. 385. 

 Leachia,^mo, 1826. Paludestrina, If Orb. 1840. Paludine-lla, 



Lov. Midd. (?=Paludinella, Pfr.) 

 Bissoa, pars, auct. 



