242 NILS HJ. ODHNER 



Fernandezia tryoni Pilsbry. — Masatierra, Aug. 191 7: El Puente, dead 

 in sand, i sh., h. 5,8, wh. 6. — Centinela Ridge, about 500 m, in ferns and 

 under leaves, i sp., h. 4, wh. 5. 



Fernandezia cylindrella n. sp. PI. 9, fig. 49. — Shell produced turrite- 

 conic, with straight or somewhat concave outline above the middle, convex 

 midway and cylindrical or slowly widening in its lower part. Two apical whorls 

 faintly convex, smooth, the subsequent ones flattened, last whorl well-rounded, only 

 in young shells with an obtuse angle in periphery. Sculpture consisting of fine 

 irregular oblique growth-lines, colour grayish horn-brown, here and there with 

 indistinct spiral streaks, paler and darker ones. Aperture semi-oval, columella 

 straight or slightly convex, truncate (not sinuous) below and carrying a very 

 faint spiral fold. Dimensions: H. 5,3, br. 1,6, h. of aperture i, br. of ap. 0,8 mm. 

 Whorls II V2. Nepionic shells (text-fig. 18, //) entirely lacking folds; larger ones 

 with only a faint columellar convexity. 



The shell varies rather considerably in the ratio height to breadth, thus 

 h. 4,5, br. 1,6; h. 4,3, br. 1,35; when slender, their base is always rounded. 



Localities. Masatierra, Aug. 1917: Rabanal, about 300 m above sea, nu- 

 merous sps., max. h. 5,3 (fig. 49), and about 400 m, under leaves, many shs., 

 max. h. 4,5. — Below Damajuana, thick forest, about 300 m, some sps., max. 

 h. 4,3. — Centinela Ridge, about 500 m, on ferns and under leaves, many shs., 

 max. h. 4,5, and 350 m, thick forest, many sps., max. h. 4,2 mm. 



In its polygyrate shape this species is similar to the Hawaiian genus 

 Leptachatina, but the structure of its radula is like that of Tornatellina, and the 

 viviparity as well as the shape of the young ones prove that it belongs to 

 Fernandezia. No shells with the animals preserved are present, thus, the anatomy 

 is unknown. 



General Remarks on Fernandezia. 



Fortunately, I have had at my disposal a sufficient material preserved in 

 alcohol o{ Fernandezia bulitnoides, a circumstance which has enabled an examina- 

 tion of its organization given below. As a result of this examination, it is 

 evident that the fam. Tornatellinidae has differentiated into several directions 

 in Juan Fernandez, which seems to speak in favour of the supposition of a long 

 isolation of its habitat, and a previous relation or connection of it with a more 

 extensive Pacific centrum, from where the original stock of Tornatellina has 

 radiated before the isolation of the genus. 



The mantle is furnished with an inferior right lobe, like that of Tornatel- 

 lina. Also, the pallial organs are similar, showing a stretched kidney, but this 

 is, in the species examined, much shorter, and occupies only half the last whorl. 



No trace of a jaw is present. 



The radula has the same shape as in Tornatellinidae, thus, it is reflected 

 circularly in its front end; otherwise, it is achatinelloid in being longitudinally 

 folded, and carrying rastroid teeth. The salivary glands are coalesced above 

 and below the oesophagus, as in Achatinellidae. The nervous system (fig. 16) 

 is more concentrated than that o{ Pacificella variabilis, though of the same type, 



