UELIX. 99 



Sowerby from the type in the Cumingian collection. In 

 regard to H. infecta^ I cannot find specific characters in 

 the specimen kindly sent me by Dr. Pfeiffer. The original 

 descriptions of these two forms now follow: — 



Helix inffcta. T. umbilieata, conoideo-depressa, tenuiter costulato- 

 striata, coruco-albida, rufo obsolete fasciata et radiata; spira conoidea, 

 vertice subtili ; anfr. 6 convexiusculi, lente accrescentes, ultimus antice 

 non descendens, peripheria obsoletissime angulatus; umbilicus conicus, 

 ^ diametri subaequans; apertura diagonalis, lunato rotundata; perist. 

 simplex, rectum, marginibus convergentibus, columellari subpatulo. 

 Diam. maj. 17 ; mia. 15 ; alt. 9 mill. Hab. in Canada teste Parreyss. 



H. STROXGYLODES. H. t. umbilicata, convexo-depressa, solidula, oblique 

 costulata, albida, maculis rufis superue variegata ; spira parum elevata, 

 obtusa; anfr. 6,sensim accrescentibus, primis isculis planu, sequentibus 

 convexis, ad suturam tumidis, ultimo non descendente, terete ; umb. per- 

 spectivus, J diametri aequante; apertura diagonali,lunato-rotundata ; perist. 

 simplice, recto, — marginibus subconvergentibus, columellari superne for- 

 nicatim patente. Diam. maj. 19 ; min. 16| ; alt. 8j mill. Hab. Texas. 



HELIX MORDAX Shuttleworth vol. iii. p. 19. 



Helix mordax Pfkiffek, Mon. Hel. Viv. iii. 635. 



I have already expressed my belief that this is a mere 

 variety of alternata. Pfeiffer (1. c.) merely repeats the 

 original description, not having seen the shell. 



HELIX CUMBERLANDIANA Lea vol. ii. p. 216, pi. xxxi. 



Carocolla Cumberlandiana Tkoschel, Ar. f. Nat. 1843, ii. 124. 

 Eelix Cumberlandiana Pfeiffer, iii. 114. 



Reeve, Con. Icon. No. 701, (1852). 



HELIX STRIATELLA Anthony vol. ii. p. 217, pi. xxx. fig. 2. 



Eelix striatella Chemnitz, ii. 115. 



Pfeiffer, iii. 100. 



Reeve, Con. Icon. No. 727, (1853). 

 Helix ruderata Adams in Sill- Journ. 40, p. 408. 



Pfeiffer refers to this species the figure of Ferussac (t. 79, 

 fig. 7) referred to perspectiva by Binney. 



The species has been found also in Kansas, Wisconsin, 

 and the District of Columbia. 



