EASTERN PROVINCE INTERIOR REGION SPECIES. 201 



SPURIOUS SPECIES. 

 Macrocyelis Elliotti, Tryon (Am. Joiirn. Conch., i, 246), is a Zonites, q. v. 



ZOJVITES, MoNTF. 



Animal lieliciform ; mantle subcentral, protected by an external 

 shell. Eespiratory and anal orifice on the right of the mantle, under 

 the peristome of the shell. Orifice of generation under the mantle. A 

 distinct locomotive disk to foot. Two i)arallel, well-marked, longitudi- 

 nal furrows above the margiu of the foot, meeting at the extremity above 

 a longitudinal caudal mucous pore. 



Shell broadly umbilicated, orbiculate, convex or discoidal, striated or 

 decussated, beneath smooth and shining ; whorls G or 7, gradually in- 

 creasing in size; aperture oblique and lunate; i)eristome straight, 

 acute, and slightly thickened internally. 



Formerly I separated the American species into two genera, Zonites 

 and Hyalina, respectively characterized by the presence or absence of 

 a (1 istinct locomotive disk to the foot, and well-marked furrows no. 210. 

 running above and parallel to the edge of the foot, meeting ^ 

 above the extremity of the tail over a distinct caudal mucous ^^^^ 

 pore (Fig. 210). I now place them all in Zonites, as all I Tail of zonifcs 



'^ \ " ' ■«■ ? suppresses, 



have examined {Z.fuliginosKs, capnodes, inorn'atus, Icevigatus, "uiarged. 

 Rugeli, deniissuSj sculptilis, ligerus, intertextus, gularis, suppressns, cerinoi- 

 deus, cellarius, placentula, lasmodon, muUidentatus^ viridulus, indentattis^ 

 fulvus, nitidus, limatulus) are so characterized, and I believe all will 

 prove to be so. 



The nature of the pore is described under Z. fuliginosus. 



The external orifice of the generative organs in the species I have ex- 

 amined is quite under the mantle, not on the right side of the head, as 

 inadvertently stated on \). 29 of Laud and Fresh- Water Shells, I. 



The distribution of the genus is world-wide. 



Fia. 211. Pig. 212. Fig. 213. 



liilMilliii" 



3a.vr oi Z.arhoreus. (Morse). S&vr oi Z.fuliginosxts. J-d^r of Z. indentatus. (Morse)- 



The jaw of Zonites is arcuate, ends acuminated, often recurved, some- 

 times blunt; anterior surface without ribs ; cutting margin with a beak- 

 like projection. I have examined the jaws of almost all of our species. 

 There is considerable variation in their form, but the general characters 

 are constant. Sometimes there is a vertical median carina, as in Z. min- 



