220 Certain Terrestrial Pulmonata 



beiug among the Helicea rather than the Vitrinea of von 

 Marten's arrangement. 



We received from Mr. Henry Venclrj^es the specimen 

 examined. 



!BLeiicoclBro&t ISoBSSieri, Ciiarp. 



The genus LeucocJtroa is adopted by von Martens (Die 

 Heliceen ed. 2, p. 78) the type being Helix candidissima 

 Drap, a species whose anatomy has been described by 

 Moquin-Tandon as being more nearly related to Zonites, 

 than to Helix. The genus is classed by von Martens among 

 the Vitrinea, the section of Helicea containing the genera 

 furnished with ribless anterior surface and median projec- 

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

 membrane. Among the species catalogued by von Martens 

 is Leucochroa Boissieri Charp. Having sometime since 

 received a specimen of this species from Mr. John Van 

 Nostrnnd, collected by him in Palestine, we have examined 

 its jaw aud lingual dentition with the following results. 



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

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

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

 The jaw resembles that of Clausilia or Pupa more than that usually 

 found in Hdix. 



Lingual membrane as usual in the HeUcIdce. 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, 

 papillaj-like teeth. 



From the above it will be seen that LeiicocJiroa Boissieri 

 must be classed among the Helicea, its lingual membrane 

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

 leate type common to Vitrina, 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 xire inclined to believe that further investij^ations will 



