/>2 URTMJBUS, MKxim \M> . F.NTKAI. AMKKICA. 



(Scutalus) todnxhjliis Ki-rii. A: CKOSSK, Mi--. Sclent. Mex., Mol- 

 lusca. i. p. .~>:;:i. ISulnnus i'inl'isfi/ln!i S ritKl'.Kl.. Ildtr. Mex. Laud- 

 und Siissw.-Conch. v, p. 70, pi. 12, figs. *", s/>. 



5. II. Mf.i-in, : Siiiiln ilfujrn'ni, Tcltnnntr]n<c ( Smnichrast). 



The variety ../</// i- M> much like D. sulcosus a- I" suggest specific 

 identity. Von Martens writes as follows: Dr. O. Stoll states, in liis 

 MS. notes, that this species is very common at the above-mentioned 

 elevations, but apparently dees not occur on the most elevated ridges 

 between Totonicapan and Terpam, nor lower than (!()()() feet on the 

 terraces of the Cordillera at Santa Maria and San" Martin. In dry 

 weather it conceals itself on the lower face of blades of grass, but 

 during and alter rain it creeps about freely. 



The relative proportion of the breadth to the length of the shell is 

 very variable, as is also the size in this species. Its chief character- 

 istics are the coarse plaits of the last whorl, the pveeedin^ whorls 

 being remarkably smoother, and the rose-color of the apertural wall 

 and of the columella. The last-mentioned ehararter distiiiiiui>hes 

 it with few exceptions from O.sulcovus, which is the corresponding 

 form in the elevated plain of Central Mexico. The rose color, how- 

 ever, is somewhat variable ; it is never wanting, and more or less 

 intense on the upper half of the columellar margin, and extends 

 sometimes upwards on to the parietal wall and beneath to near the 

 base of the aperture; in some specimens the whole interior of the 

 aperture is pale rose-colored, and a stripe which on the outside i> 

 dark brown appears in the interior intense reddish-brown. 



1). HEGEWISCH1 (IMVilli-r). IM. 1, figs. SI, SL>, 83, S I. 85. 



Shell ovate, thin but moderately -Irong, very narrowly perforate ; 

 whitish, usually stained in places with light brown, and having un- 

 eipially spaced, narrow, brown longitudinal streaks which do not ex- 

 tend to the suture above, and are often obsolete at the base. Surface 

 shining, irregularly wrinkle-slriate, and .-bowing line, suhob-olete 

 spiral lines under the lens. Spire conic, the apex obtuse, with typi- 

 cal J)/-i/,.i t /-n\ -culpture : whorl- .">.',. but slightly convex, (lie laM oval. 



Aperture loii'_ r -<>\ate. light In-own or yellowish inside, showing dark 

 streak- ; peri-tome thin and unexpamled, acute ; columellar margin 

 rellexed for a short di-tanee aho\e. nearlv do-ing the perforation, 



Alt. L ; .", diam. iL."., len-ih of aperture II mill. 



ili-iil Mi'.i-ii-n: nirini/is ,,/' Mi-.rini, in titrra fria, on C'aclus 



