146 LAND AND FRESH-WATER SHELLS OF N. A. [PART IV, 



8. G. occata, Hinds. 



Melania occata, HlXDS, Ann. and Mag. Nat. Hist, xiv, p. 9. Zool. Toy. Sulphur. 



Moll, ii, p. 56, t. 15, f. 5. Catlow, Conch. Nomenc p. 188. Brot, List. p. 34. 



Lea, Proc. Acad. Nat. Sci., p. 81, April, 185G. Reeve, Monog. Mel., sp. 2(j7. 

 Juga occata, Hinds, Chesu, Man. de Couchyl., i, f. 2016. 

 Melania Shastaensis, Lea, Eeeve, Monog. Mel. sp. 318. 



Description. — Shell ovate, elongate, lutescent; whorls few, rounded, 



grooved, intei-mediate ridges narrow, acute: spire eroded 

 Fig. 270. " 



above the fourth whorl ; aperture cajrulescent. 



Habitat. — River Sacramento, California. 

 Observations. — The rounded whorls are ploughed into 

 numerous furrows and the intervening ridges are com- 

 paratively narrow and keel-shaped; the lower part of 

 the aperture is somewhat dilated, and slightly disposed 

 to elongate in the manner of lo. — lieeve. 



Mr. Reeve, and Dr. Brot following him, have fallen into the 

 error of quoting Shastaensis as a synonyme through that pro- 

 lific source of error " an authentic specimen." The figure of 

 ^'■Shastaensis" given by Reeve from a specimen in the collec- 

 tion of Mr. Cuming is finer than any specimen of occata that 

 I have seen. The species varies in form very much. 



9. G. catenaria, Say. 



Melania catenaria. Say, Jour. Acad. Nat. Sci., ii, p. 379, Dec. 1822. Bijwet, Reprint, 

 p. 111. BiNNEY, Check List, No. 52. Reeve, Monog. Melania, sp. 336. DeKay, 

 Moll. N. York, p. 93. Wheatley, Cat. Sheila U. S. p. 24. Gibbes, Rep't. 

 S. Carolina, p. 19. Jay, Cat. 4th edit., p. 273. Catlow, Conch. Nomenc. p. 185. 

 Bkot, List, p. 34. 



EKmia catenaria, Lea, Adams, Genera, i, p. ."500. 



Melania sublirata, Conuad, Jour. Acad. Nat. Sci., 2nd ser. i, pt. 4. p. 277, t. 38, f. L 

 Jan. 1850. Brot, List, p. 37. Reeve, 3Ionog. Melania, sp. 339. 



Description. — Shell conic, black; whorls seven or eight, slightly 



undulated transversely, and with eight or nine revolving, ^. 



•" ° *' Fig. 271. 



elevated lines, of which the four or five superior ones are 

 almost interrupted between the undulations. Ml 



Length less than half an inch. ^^ 



Habitat. — South Carolina. '-^ 



Observations. — The essential specific character resides in the cate- 

 uated appearance of the superior revolving lines of the whorls, result- 

 ing from their being more prominent on the undulations which they 



