290 MANUAL OF THE MOLLUSCA. 



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

 PI. XII., Fig. 9), Desm. 



Shdl thin, polished ; peristome thin, not reflected. 



Animal with the tail truncated and glandular, like Arion ; 

 mantle-margin produced, partly covering the shell. 



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

 land, Pacific Islands, West Indies. 



Tany stoma (tubiferum), 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. 



YiTRiJSTA, Draparnaud. Glass-snail 



Type, Y. Draparnaldi, PI. XII., Fig. 28. 



Synonym, Helicolimax, Fer. 



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. • 



F. Cuvieri and Freycineti (Helicarion, Fer.), tail longer, more 

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

 developed. 



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

 Old World. 



Sub-genera. Daudebardia, Hartm. (Helicophanta, Fer.) V. 

 brevipes, PI. XIL, Fig. 29. 



Shell perforated, horizontally involute ; aperture oblique, 

 ample. 8 species. Central Europe. 



Simpulopsis (sulculosa). Beck. 



Shell succinoa-shaped. 5 species. Brazil. 



SUCCINEA, Draparnaud, Amber-snail. 



Type, S. putris,.Pl. XII., Fig. 23. 



Synonyms, Cochlohydra, Fer. ; HeHsiga (S. Helense), Less. ; 

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



Shell imperforate, thin, ovate or oblong ; spire small ; aporturo 

 large, obliquely ovat ; columella and peristome simple, acut(\ 



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



