270 



NORTH AMERICAN FAUNA. 



[No. 7. 



LIST OF SHELLS. 



Glandina decussata. 

 singleyana. 



tcxasiana. 

 Strepfoslyla sololensis. 

 Li max campesiris. 

 Patula striatella. 

 Helix (Arionta) magdalenensis. 

 colorttdocnsis. 

 mormon i< in. 

 tudicitlata. 

 cypreopldla. 

 arrosa. 

 (Pralicola) griseola. 



berlandieriana. 

 {Mcsodon ) thyroides. 

 ( Polygyra ) texasia n a. 

 bieruris. 

 Pupa {Vertigo) pentodon. 

 Bulimultts dealbatus. 

 alternates, 

 serperastrus. 

 Succinea luieola. 



oregonensis. 

 Limncoa caperata. 



Limnaa mi tin I liana. 

 It ii in His. 

 bulimoide8. 

 Plauorbis lenlus. 



liebmanni. 

 parvus 

 trivolvis. 

 Physa gyrina. 



hderostroplia. 

 Carinifex newberryi. 

 Amnicola micrococcus, sp. nov. 



poratu. 

 Tryonia olathrata. 

 Fluminicola fit sea. 



mcrrlami. 

 fusca minor. 

 nutiaUiana. 

 Helicin a ch rrsocli ei la . 



tropica. 

 Anodonta nulla lliana. 

 Unto anodontoides. 



berlandieri. 

 Pisidium occidvn tale. 



Class -GASTROPODA. 



Order PULMONATA. 

 Suborder GEOPHILA. 



Glandina decussata Pfr. 



Hidalgo, Tamaulipas, Mexico (Mus. No. 123571), William Lloyd, March, 1891. 



These examples, three in number, are not decussated, but are sculp- 

 tured only by the Ion gitudinal incremental lines ; they have the usual 

 glossy or semi polished surface characteristic of the group. These speci- 

 mens are rather between the variety singleyana and the typical decus- 

 sata, and indicate what is exhibited in other related forms, conspicu- 

 ously in the shells of G. truncata of Florida, a considerable range of 

 variation. 



Glandina singleyana W. G. B. 



? = G. decussata Pfr., variety. 

 Hidalgo, Tamaulipas, Mexico (Mus. No. 123572); also Monterey, Mexico (Mus. No. 

 123906), Feb., 1891, William Lloyd. 



Two examples very close to G. texasiana, the principal difference 

 being the curve and form of the termination of the columella. This 

 seems to be the form that Mr. Binney refers to as collected by Prof. 

 Wether by in Bexar County, Tex., which he figures and calls decussata 

 var. singleyana in Bull. Mus. Comp. Zool., Vol. xxn, No. 4, PI. 1, Fig. 

 4, pp. 1G3-203. 



