290 MANUAL OF THE MOLLTJSCA. 



Synonyms, Nanina (citrina), Gray; Arioplianta (laevipes, 

 PI. XII., Pig. 9), Desm. 



Shell fhin, polished ; peristome thin , not reflected. 



Animal with the tail truncated and glandular, like Avion ; 

 mantle-margin produced, partly covering the shell. 



Distribution, 295 species. South Asia and Islands, New Zea- 

 land, Pacific Islands, "West Indies. 



Tanystoma (tuhiferum), Benson, 1856. Shell like Anastoma, 

 minute, umbilicated; aperture disengaged, trumpet-like, 

 toothed. Banks of the Irawadi, above Prome. 



Pfeifferia (micans), Gray, is a, Nanina without the mucus-pore 

 at the tail. Philippines. 



YlTEnfA, Draparnaud. Glass-snail 



Type, V. Draparnaldi, PL XIL, Pig. 28. 



Synonym, Helicolimax, Per. 



Shell imperforate, very thin, depressed ; spire short, last whor 

 large ; aperture large, lunate or rounded, columellar margin 

 slightly inflected, peristome often membranous. 



Animal elongated, too large for complete retraction into the 

 shell ; tail very short ; mantle reflected over the shell-margin, 

 and furnished with a posterior lobe on the right side. Lingual 

 teeth (of type) 100 rows of 75 each ; marginal teeth with a single 

 long, recurved apex. (Thomson.) Occasionally animal-feeders, 

 like the slugs. 



V. Cuvieri and Freycineti (Helicarion, Per.), tail longer, more 

 abruptly truncated, with a caudal gland like arion, mantle moro 

 developed. 



Distribution, 87 species. Most abundant in north part of the 

 Old World. 



Sub-genera. Daudebardia, Hartm. (HeHcophanta, Per.) Y. 

 brevipes, PI. XIL, Pig. 29. 



Shell perforated, horizontally involute; aperture oblique, 

 ample. 8 species. Central Europe. 



Simpulopsis (sulculosa). Beck. 



Shell succinea-shaped. 5 species. Brazil. 



Stjccinea, Draparnaud, Amber-snail. 



Type, S. putris, PI. XIL, Pig. 23. 



Synonyms, Cochlohydra, Per. ; HeHsiga (S. Helenae), Less. ; 

 Amphibulima (patula). Beck ; Pelta (Oumingii), Beck. 



Shell imperforate, thin, ovate or oblong ; spire smaU ; aperture 

 large, obliquely oval ; columella and peristome simple, acute. 



Animal large, tentacles short and thick, foot broad ; lingual 



