226 TERRESTRIAL AIR-BREATHING MOLLUSKS. 



Arion foliolatus, GOTTLB, Moll. IT. S. Exped., 2, Fig. 2, a, b (1852). 

 Terr. Moll., II. 30, PI. LXVI. Fig. 2 (1851). W. G. BINNET, Terr. Moll., 

 IV. 6 ; copied also by TRYON and W. G. BINNEY, L. & Fr.-W. Sh., I. 377. 



Jaw? 



Lingual membrane ? 



Found at Discovery Harbor, Puget Sound. 1 



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



figure. 

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



ARIOLIMAX, MoRCH. 8 



Animal Kmaciform (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 erroneously quoted from Boston, by Grateloup, Distr. Geog. des Limaciens, p. 8. 



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

 marginibus liberis, testam simplicem hand spiralem, solidam includens. Margo infera 

 animalis sulco longitudinal! supra pedem posito muuita. Discus gressorius distinctus. 

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

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

 sub parte anteriore libera pallii posita (in A. California) duobus orificiis distinctis mu- 

 nita). Porus mucosus 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 medianse tricuspidatse ; laterales bi- 

 cuspidatte ; marginales quadratse, irregnlariter cuspidatas, cuspide iuterua producta, ex- 

 terna srepissime 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. Morch primo descriptura, Mai. Blatt., VI. 110, Oct., 1859 ; postquam a W. 

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

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

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

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



Genus Limaci, Arioni et Prophysaonti affine, sed facile distinguendum. Limaci affine 

 est testa interna, positione aperturse respiratorise, et disco gressorio distincto ; sed differt 

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

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

 tincto, maxilla costata, lamina linguali, positione aperturse genitalis ; sed differt positione 

 apertuvse respiratorise, et testa interna. Prophysaonti simile testa interna, maxilla cos- 

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

 gressorio distincto, et poro mucoso caudali. 



Ab ceteris generibus Americanis limacifornubus aut sublimaciformibus, Veronicella, 

 Binneia, Hemphillia, Tebennophoro et Pallifera sat distinctura est. 



