262 New Land Shells from Costa Rica. 



the outer one is so on the extreme marginals. There are 

 hardly more than twelve perfect laterals. The change into 

 marginals is very gradual. 



Veronicella . 



Jaw as usual in the genus : 30 to 40 ribs. 

 Lingual membrane as usual in the genus. See Terr. Moll. 

 U. S., v, 240. 

 The species is unknown to me. Its body is long and narrow. 



Bulimulus Irazuensis, Angas.* 

 Pi. XI. tig. L, represents an extreme lateral tooth of this 

 species. The laterals are extremely numerous, reaching quite 

 to the outer edge of the membrane, without changing into 

 marginals. I could not detect the central or first lateral teeth. 

 The jaw is of the same type as that figured by me (Ann. 

 Lye. N. H. of K Y., 1875, XI, pi. XYI, fig. A) of B. Urn 

 nceoides, Fer. Tbe median ribs in this species, however, are 

 very oblique. In all there are about 32 ribs. 

 * Proc. Zool. Soc, Jan. 1878, 73, PI. V, figs. 17-20. 



EXPLANATION OF PLATE XL 



Fig. A Velifeka Gabbi, Animal in motion. 



B Shell. 



C Lingual Dentition. 



D ... Caudal mucus-pore. 



E same ? Shell. 



F '. Lingual Dentition. 



G Small species of Helix Lingual Dentition. The extreme 



marginal on a larger scale. 



H Cryptostrakon Gabbi, Animal in motion. 



I . . Jaw. 



J Rudimentary Shell. 



K Lingual Dentition 



L Bulimulus Irazuensis Extreme lateral tooth. 



M Tebennophorus Animal. 



N Lingual Dentition. 



Limax semitectus ? Animal. 



P Jaw. 



Q Lingual Dentition. 



