MOLLUSCA FROM JUAN FERNANDEZ AND EASTER ISLAND 249 
The terrestrial mollusca collected belong to the following species: 
Limax arborum Bouchard-Chantereaux, many sps., max. ]. 33 mm, */;. 
*Milax gagates Draparnaud, many sps., max. |. 23 mm, */7. 
*Melampus philippii Kiister, 1 sp., h. 9,5 mm. 
Melampus pascus n. sp. PI. 8, fig. 5. — Shell small, short and broad, 
without trace of umbilicus, smooth, except very fine lines of growth; colour 
light yellowish-brown, paler (almost grayish-white) on the shoulder and the base 
of the body-whorl; middle of this whorl with 3 narrow, almost obsolete, lines 
of yellow. Aperture with 3—4 lamellae on the columellar wall, the uppermost 
(or second) under the middle of the aperture height, and very strong, the 3rd 
very indistinct and separated from the 4th by a deep sinus; the undermost 
fold strongly twisted, crossing the lip and joining its outer margin. Outer lip 
with simple margin having 8 long plicae deep on its inside but no callus at its 
margin. Spire much depressed, with a small acute apex. Whorls 8. Dimen- 
sions of the shell: height 5,2, h. of aperture 4,5, breadth of the shell 3,6 mm. 
The small size and the short and broad habitus of this shell, of which 
only two dead specimens were collected on the beach, separate it from the 
preceding species and approach it to J/. érevis Gassies, from N. Caledonia, or 
to M. parvulus (Nuttall) Pfeiffer, from the Sandwich Islands. From both it is, 
however, distinct in the kind of armature of the aperture. 
Pacificella n. gen. (Tornatellina Pilsbry, 1915, partim, non \Beck] Pfeif- 
fer, 1842). 
Shell small, imperforate, uniformly brown or corneous, aperture with a 
parietal lamella (sometimes lacking in adult specimens), and a sinuous, often 
lamellate, columella; palatal wall smooth or variously toothed. 
Genital organs with a well developed penis, situated above the eye retractor 
and having a bifid retractor, inserted with its one part on the penis proper, 
and with the other on a short flagellum; spermatheca with long stalk; albu- 
miniparous gland well developed; no, or vestigial, vesicula seminalis. 
It becomes necessary to separate generically the species described below 
from the genus 7ornatellina in its original sense, restricted to the Juan Fernandez 
forms, on account of important anatomical differences. These characters, it is 
true, are found hitherto in one single species only, and thus the limitation of 
the new genus cannot yet be stated, but it seems likely that a large number of 
the species referred to Zornatellina in the sense of PILSBRY, will show congenity 
with the present new form in their anatomy quite as well as they do in their 
shells. Previously, until further knowledge has been gained, the genus Pacifi- 
cella may be retained within the same family as the typical Tornatellinas; to 
this family the name Tornatellinidae is to be attributed on the grounds exhibited 
above by treating the Juan Fernandez fauna. 
Pacificella variabilis n. sp. PI. 8, figs. 15—17. — Shell elongate, imper- 
forate, horn-brown, often with pale-brown narrow spiral lines on the last whorl; 
