ABIDA. 309 



quilla] hordeum(l) Milii. Somewhat smaller than the pre- 

 ceding [avena Drap.j, and perhaps often confused with it, but 

 appears to be different." (Studer, Kurzes Verzeich., 1820, 

 p. 89.) 



The name was next used as "Chondrus secale var. Ch. hor- 

 deum" by Hartmann, System der Erd- und Siisswasser Gas- 

 teropoden Europa's, in Sturm, Heft 5, 1821, p. 50, no de- 

 scription; Sturm's Deutschlands Fauna, vi, Abth., Die Wur- 

 mer, 7. Heft, 1824, pi. 5, and accompanying text (lettered on 

 plate "Chondrus secale Cuv. var. hordeum Aud.," apparently 

 an engraver's error for Stud.). Hartmann refers to Studer 's 

 Torquilla hordeum as identical. He gives the localities: bei 

 Bern fand sie Herr Professor Studer; also Sarganserland and 

 Zurich. Hartmann notes that it is shorter and somewhat more 

 ventricose than secale, 3 lines long, and of 8 whorls. His 

 figure is copied, pi. 47, fig. 16. 



As this was the first recognizable definition of Studer 's 

 form, and in all probability founded upon specimens from 

 Studer, the name hordeum should be restricted to Bern shells 

 agreeing with Hartmann 's figure. 



In his Catalogue des Moll. terr. et fluv. de la Suisse in 

 Neue Denkschr. der allg. Schweizerischen Ges. gesammten 

 Naturwiss., i, 1837, p. 16, pi. 2, f. 7, Charpentier records, 

 "Rare. Roches Calcaires: Devens, Pierre a Besse," and gives 

 figures which represent a long, cylindric form probably of 

 secale, length 12.5 mm. 



Westerlund (Fauna, iii, p. 110) has accepted this form to 

 represent hordeum; yet Charpentier 's form is certainly not 

 that of Studer or Hartmann. Cornm. Caziot has also dis- 

 cussed hordeum, Feuille Jeunes Naturalistes, 1910, no. 474, 

 p. 94, but without knowing of Hartmann 's publication, whicli 

 appears to me the only important work on the variety. 



Var. cylindrica Locard. Shell of a somewhat cylindric, 

 elongate shape, not swollen, measuring 8-9 mm. long, with 

 whorls but little rounded. Aperture with 9 folds, having an 

 inconspicuous fold at the angle of the columellar margin. 

 Debris of the Rhone (Variations Malac., 1880, p. 259). 



Var. decempUcata Bourguignat MS., Locard. Shell resem- 



