352 ENDODONTICS 



(Sub-fam. : Pleurodiscins.) 



Genus : 3. PLEURODISCUS, Wenz. 



Etym. : — Gr. irXivpa. + SiVkos, a ribbed disc. 

 Type : — Helix Bahnei, Potiez & Michaud. 

 {Helix, Pyramidula, Patula, vett. auctt.) 



1919. Pleurodiscus, subg. of Goniodiscus : Wenz, Nachrbl. 

 Deutsch. Malah. Gesell, li, p. 78. 



1. Pleurodiscus flavidus (Rossmassler). 

 Etym. : — Lat. Jlavidus, yellowish. 



1836. Helix striolata, Pfeif. : Philippi, Enum. Moll. SicHice. 



i, p. 129. [Non C. Pfeiffer, 1828.] 

 1838. Helix Bahnei, nob. : Potiez & Michaud, GaU. Douai, 



i, J). 120. [Nou Helix (Circinaria) Balmei, 



Michd !, Beck, 1837.] 

 1839,1 Helix flavida, Zgl. [MS.] : Rossmassler, Icon., ii, 

 Sept./ lift. 3-4, p. 13, pi. xlvii, f. 610. 



1839,\ Helix Erdelii, nob. : Roth, Moll. Itin. Schuberti, p. 16, 

 Dec. J pi. i, f. 4, 5 & 20. 



*1843. Helix Teresce : Benoit, La FarfaUeta, Nouv. Ser., Ann. 



i, vol. i, p. 179. [Also in reprint, p. 9.] 



1855. Discus Erdelii, Roth : H. & A. Adams, Genera Moll., 



ii, p. 117. 



1856. Helix (Hyalina) Bahnei, Pot. & Mich. : Pfeiffer, Malak. 



Bldtf., ii, p. 124. 

 1878. Patula [Patulastra) flavida, Ziegl. : Pfeiffer, Nomencl. 



Helic. vivent., ed. Clessin, p. 90. 

 1889. Helix (Patula) bahnei. Pot. & Mich. : Westerlund, 



Fauna Paldarct. Region, ii, p. 12. 

 1893. Pyramidula (Gonyodiscus) balmei, P. & M. : Pilsbry, 

 Manual Conch., Ser. II, vol. ix, p. 47. 

 Found in the glass-houses at Glasnevin, near Dublin. 

 (Stelfox, Proc. R. Irish Acad., xxixB, 1911, p. 133.) 



Earn.: ENDODONTID^. 

 Genus : 1. HELICODISCUS, Morse. 



Etym. : — Gr. eXi^ + Sto-Kos, a spiral disc. 



Type : — Helix lineata. Say = Planorbis parallelus, Say. 



{Helix, Zonites, Pyramidula, vett. auctt.) 



1864. Helicodiscus : Morse, Journ. Portland Soc, i, pp. 5 & 25. 



1. Helicodiscus parallelus, Say. 



Etym. : — Gr. TrapttXAy/Xos, parallel. 



1817. Helix lineata: Say, Journ. Acad. Nat. Sci. Philad., i, 

 p. 18. Also *., ii, 1824, p. 273. [Non 

 Olivi, 1792.] 



