220 Certain Terrestrial Pulmonaia 



hu'wY^ among the IMicea rather than the Vitrinea of von 

 Marten's arrangement. 



We received from Mr. Henry Venchyes the specimen 

 examined. 



Eie^icoc^trosa SEoissieri, Ciiai?p. 



The genns Leucochroa is adopted l)y von ^Martens (Die 

 Heliceeu ed. 2, p. 78) the type being IMix candidissima 

 Drap, a species whose anatomy has been described by 

 Moquin-Tandon as i)eing more nearly related to Zoniten, 

 than to Helix. The genus is chissed by vo!i Martens among 

 the Vitrinea, the section of Helieea containing the genera 

 furnished with ribless anterior surface and niedi:in projec- 

 tion to the jaw, and aculeate, marginal teeth to the lingual 

 membrane. Among the species catalogued by von Martens 

 is Leucochroa Bolssieri Charp. Having sometime since 

 received a specimen of this species from ^Ir. John Van 

 Nostrand, collected by him in Palestine, Vv'e have examined 

 its jaw and lingual dentition with the following results. 



Jaw very low, long, arcuate, ends but little attenuated, bluntly 

 rounded. Cutting edge with a decided median projection, anterior sur- 

 face free from ribs, with a strong, transverse line of reinforcement. 

 The law resembles that of CkiusiUa or Fupa more than that usually 

 found in Hdix. 



Lingual membrane as usual in the Hdicidai. Centrals short and stout 

 with a bluntly pointed median tooth, the side teeth almost obsolete. 

 Laterals with a very long, oblique, blunt inner tooth, the outer tooth 

 almost obsolete. Marginals subquadrate, with several short, blunt, 

 papillae-like teeth. 



From the above it will be seen that Leucochroa Boissieri 

 must be classed among the Helicea, its lingual membrane 

 havinf the quadrate type of marginal teeth, and not the acu- 

 leate type common to Vilrina, Zonites and other Vitrinea. 

 Its jaw is of the form often found in the Helicea. Judging 

 from both jaw and lingual membrane, we would not separate 

 the species from the genus Helix as received by von Martens. 

 We are inclined to believe that further investigations will 



