226 TERRESTRIAL AIR-BREATHING MOLLUSKS. 



Arion foliolatus, Gould, Moll. U. S. Exped., 2, Fig. 2, n, b (1852). — Binney, 

 Terr. Moll., II. 30, PI. LXVI. Fig. 2 (1S51). — W. G. Binney, 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. 

 Avion Andcrsoni (see p. 235, footnote, and 236, 239). 



ARIOLIMAX, M6rch. s 



Animal limaciform (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. t 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, 

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

 animalis sulco longitudinali supra pedem posito munita. 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. Californico duobus orificiis distinctis mu- 

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



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

 ginihus denticulatis. 



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

 cuspidata? ; marginales quadratae, irregulariter cuspidata?, cuspide interna producta, ex- 

 terna saepissime 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 descriptum, Mai. Blatt., VI. 110, Oct., 1859 ; postquam a W. 

 G. Binney, Amer. Journ. Conch., I. 48, PL VI. Pig. 11-13, 1865; delude, W. G. Bin- 

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

 ad Linuicem 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, Arinni et Prophysaonti affine, sed facile distinguendum. Limaci affine 

 est testa interna, positione apertura; respiratoria?, et disco gressorio distincto ; sed differt 

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

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

 tincto, maxilla costata, lamina linguali, positione apertura? genitalis ; sed differt positione 

 apertura? respiratoriae, et testa interna. Prophysaonti simile testa interna, maxilla cos- 

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

 gressorio distincto, et poro mucoso caudali. 



Ab ceteris generibus Americanis limaciformibus aut sublimaciformibus, Veronicella, 

 Binneia, Hemphilliu, Tebennophoro et PalU/era sat distinctum est. 



