HELICIGONA. 307 



H. arbustorum Linne. subalpina Scholtz. 



v. canigonensis Boub. /. costulata Kob. 



canigoniea Fag. v. dorise Paul., iv, 117. 



v. fagoti Bgt. v. rudis Miihlf., iv, 118. 



v. xatarti Far., iv, 118. v. corneoliformisLess. 



v. repellini Charp., iv, 118. v. styriaca Ffld., iv, 119. 



v. alpicolaFer. H. sethiops Biz., iv, 118. 



tris Z., iv, 118. H. camprodunica Kob., iv, 118. 



Other named forms of H. arbustorum, some of which have doubt- 

 less good claims to racial distinction, are: Var, thamnivaga, hypni- 

 cola, themita Mabille ; var. dravica, vibraiana, musdorfensis, illusana 

 Servain ; var. sendtneri, excelsa, septentrionalis Clessin ; var. albu- 

 lana, feroeli, knitteli, nazarina, trachia (Bgt.) Serv. ; var. creticola 

 Morch. ; var. trochoidalis Roffisen ; var. depressa Held. ; var. baylei 

 (Lecoq) Moq. ; var. gotlandica; oelandica West. Also forma 

 flavescens, albina, rufescens, draparnaudia, poiretia, boissieria, 

 thomasia Moquin-Tandon ; /. ef'asciata Westerlund ; /. lutescens, 

 luteofasciata, fuscesens D. & M. (=marmorata Taylor) ; /. mor- 

 bosoalbina Rossm. ; /. nigrescens Locard, /. fusca Fer. ; /. cincta 

 (=pallida Tayl.), sinistrorsum Taylor; /. minima and major Pfr. 



Subgenus ELONA H. & A. Adams, 1855. 



Elona H. & A. AD., Gen. Rec. Moll, ii, p. 211, type H. quimperi- 

 ana (June, 1855). Not Elona Moq.-Tand., 1855. Sterna ALBERS, 

 Die Hel., p. 93, 1850, same type (preoccupied). See HESSE, Jahrb. 

 D. M. Ges., xii, 1885, p. 45, pi. 3, f. 1 (anatomy). 



Shell um\)i\icsite, planorboid, the spire slightly concave, periphery 

 broadly rounded ; corneous with a few varicoid white stripes ; 

 aperture lunar, slightly oblique ; lip white, expanded above, reflexed 

 below, the ends distant. Type H. quimperiana Fer., pi. 43, figs. 19, 

 20, 21. 



Jaw with 11-16 narrow ribs. Genitalia (pi. 62, figs. 24, 25, 26, 

 27, H. quimperiana) differing from the typical Helicigonas in hav- 

 ing the mucus glands shortened into triangular sacks (fig. 26) and 

 the dart sack is inserted in a sort of calyx at base (fig. 27). Dart 

 curved at the end, with lens-like section (fig. 24). 



This group contains a single French species remarkable for its 

 {Jhloritis-like shell and the peculiar mucus glands. The latter con- 



