226 TERRESTRIAL AIR-BREATHING MOLLUSKS. " 



Arion folio lot us, OouLn, Moll. U. S. Expetl., 2, Fig. 2, a, b (1852). — Bikney, 

 Terr. Moll., II. 30, I'l. LXVI. Fig. 2 (1851). —W. G. Binney, Terr. Moll., 

 IV. 6 ; copied also by Tuyon and W. G. Binney, L. k Fr.-W. Sh., I. 377. 



Jaw — ? 



Lingual membrane — ? 



Found at Discovery Harbor, Puget Sound.* 



This species is still unknown otherwise than by the original description and 

 figure. 

 Arion Andersoni (see p. 235, footnote, and 236, 239). 



ARIOLIMAX, MoRCH. • 



Animal liraaciform (Vol. III. PI. LXVI. Fig. 1), blunt in front, pointed be- 

 hind. Mantle anterior, small, bluntly truncated before and behind, free around 

 its edges, containing a well-defined, solid, testaceous plate. A longitudinal fur- 

 row along the sides above the foot. A distinct locomotive disk. Respiratory 

 orifice at the posterior third of the mantle, with a cleft to its right margin. 

 Anal orifice contiguous to the last, slightly below and behind it. Orifices of 



1 It is erroneonsly quoted from Boston, by Grateloup, Distr. Geog. des Limaciens, p. 8. 



2 Animal limaciforme, postice acuminatum. Pallium antice situm, parvuni, obtusum, 

 marginibus liberis, testam siniplicem baud spiraleni, solidam includens. Margo iiifora 

 animalis sulco longitudinali supra pedeiii posito niiuiita. Discus gressorius distinctus. 

 Apertura respiratoria ad marginem dextrara pallii in parte posteriore posita ; apertura 

 analis viciiia, sed postice et infra posita. Apertura genitalis ad latus dextrum corporis, 

 sub parte anteriore libera pallii posita (in A. Ca^i/c>?7iii'co duobus orificiis distinctis mu- 

 nita). Porus raucosus caudalis triangularis erectus supra apicem pedis. 



Maxilla leviter arcuata, costis numerosis (VIII -XX), validis, confertis munita ; mar- 

 ginibus denticulatis. 



Lamina lingualis ut in Helice constituta. Dentes medianae tricuspidatce ; laterales bi- 

 cuspidatie ; marginales quadratae, irregulariter cuspidatae, cuspide interna producta, ex- 

 terna sajpissime subobsoleta. 



Habitat in regionibus Pacificis Statuorum Unitorum, inter Oceanum et montes " Cas- 

 cade" et "Sierra Nevada" dictas, de lat. 34° usque ad 49°. 



Genus a cl. Mcirch primo descriptum, Mai. Blatt., VI. 110, Oct., 1859 ; postquam a W. 

 G. Binney, Amer. Journ. Conch., L 48, PI. VI. Fig. 11-13, 1865 ; delude, W. G. Bin- 

 ney et T. Bland, L. & Fr.-W. Sh. N. A., I. 278, Fig. 496-498, 1869. Ceteris auctoribus 

 ad Liitutci7n refertur : Gould in Terr. Moll. U. S., II. 1851 ; VV. G. Binney ante, Ter. 

 Moll., IV. 1859 ; Tryon, Am. Journ. Conch., III. 315, 1868. 



Genus Limaci, AHoni et Prophysaonti affine, sed facile distinguendum. Liviaci affine 

 est testa interna, positione aperturae respiratoriae, et disco gressorio distincto ; sed differt 

 poro nuicoso caudali, maxilla costata, dentibus marginalibus quadratis laminae lingualis, 

 et positione aperturae genitalis. Arioni simile poro mucoso caudali, disco gressorio dis- 

 tincto, maxilla costata, lanuna linguali, positione apertura? genitalis ; sed diifert positione 

 aperturae respiratoriae, et testa interna. Prophysaonti simile testa interna, maxilla cos- 

 tata, lamina linguali ; sed differt positione aperturarum, respiratoriae et genitalis, disco 

 gressorio distincto, et poro mucoso caudali. 



Ab ceteris generibus Americanis limaciformibus aut sublimaciformibus, Veronicella, 

 Binneia, Hemphillia, Tebennophoro et PaUifera sat distinctum est. 



