IIEBRA. -1" 



i> defined by nodules ; ribs not close-. frequently broken into 

 nodules by the revolving stria' ; eolumclla callus ral her widely 

 spread. Usually olive, chocolate or nearly black, li.-ht h:mded 

 <>n the periphery nnd flecked with revolving chestnut si 

 sometimes the shell is nearly white, nnd then. Avhilst retaining 

 tlie red spots, the band is also red, or absent. 

 Length. MI--S inch. 



J/idft-8 ; Atlitntn' Couxl of the Untied Miffs. itnrtlunnrd 

 to Chesapeake Bay : 



2 



c-ol 

 bot 



;::; 



Say's type was a stunted specimen, and is badly figured (tig. 



*). Reeve's figure represents n very different species, a juven- 

 ile A'. ftnl)*/, inoMt, Lam.. from the I > hilii)j)ines ; but \. Anf/llnntni , 

 'hil. (lio-s. IDJU^OI . aixl X. Stwmii, I'hil. (I'm-. -20--' . will o-ivc a 



r rejiresentation of tlie usual ranuc of the species in size and 

 color. J/. texwllnia. IJeeve ( iio-. -1(\\\ , N.Jiiiu, Kceve ( li^-. 204 . 

 both described without locality, and A', dnixculuis, lleeve (iir. 

 ). from Si. Thomas. \V. I., are also synonyms. A'. /'"relt'Hxrft. 

 kin s (fig. 206), is supposed by its author to j>ossess distin- 

 guishing characters in its proportions, sculpture and color, but 

 it is well within the r:mv of vai'iation of A', rihr.r, in all these 

 particulars : it is ibund, tliou^h I'arely. at New Haven. ( 1 onn.. 

 and near Salem, Mass., and may have been carried there with 

 southern oysters. X. fmnrimahilit. Marrat. an unh't>-ured specie^ 

 from \;iss.-ui (Bahamas y). is ;dso a probable synonym. A'. /><>fi/- 

 </<>,)rrfr/. J,;un. (lig. :><)7). is certainly very closely allied to A'. 

 nibex ; it has been misunderstood by Heeve. who has tiu'iired for 

 it a very different species, and Kiener has confounded with it A'. 

 tTacksoniana, (^uoy. a var. of JY. nunuli'. Kiener. m 



Siib-um.- Hebra, II. a^il A. Adum.-. 



1 retain this group after modifying the original diagnosis, 

 which only applies to immature specimens. The muricated or 

 spinose ornamentation forms a convenient separation from 

 /'hroiifift, and the columella callus is also more defined, but the 

 spire is not elevated " more than usual, nor is the outer lip 

 without varix or denticulatiops, when mature. 



N. SLBSPINOSA, Lam. PI. i:j. figs. Jus ~'2\'>. 



Spiny, nodulous, the nodules generally forming three promi- 

 nent revolving series on the body-whorl, but sometimes subor- 



