252 NILS HJ. ODHNER 



PiLSBRY, 191 5, on Auriculella pulchra from the Hawaii Islands, which has the 

 penis crossed by the right eye retractor, the penis retractor simple, and a 

 rudimentary albuminiparous gland. The new form approaches, on the contrary, 

 in the two last-named characters, the fam. Achatinellidae, and in all these 

 respects the typical genera of Tornatellinidae from the Juan Fernandez Islands, 

 but Pacificella seems to be more primitive, whereas the named families have 

 become specialized in one direction or other. 



Addenda. 



Since the preceding pages passed through the press, I received from prof. 

 Skottsberg a few further shells from Masafuera. These are of interest, since 

 only a small number of forms were collected in this island, the mollusc fauna 

 of which seems to differ essentially from that of Masatierra, above all in the 

 absence of the Tornatellinidae. Only some small species of Endodontidae and 

 Succineidae are endemic, and to the same families belong the following new 

 species, too. They were taken by prof. Skottsf^ERG in earth from the Sanchez 

 Plateau, 515 m, thin forest (^^2 1917). 



Endodonta (Thaumatodon) skottsbergi n. sp. Figs. 22, 23. — Shell (fig. 

 23) discoidal, with plane spire and broad perspective umbilicus, about a 



Fig. 22. Radula teeth of Endodonta skottsbergi n. sp. X 830. 



third of the shell diameter in breadth. Whorls narrow, slowly increasing; 

 suture deep. Protoconch radiately striate, post-nuclear whorls very finely trans- 

 versely ribbed, interstices between the ribs with microscopical spiral striae. 

 Colour light yellowish with brown transverse flames. Aperture slightly oblique, 

 reniform, narrowly sinuate above, widely below; lip sharp, thin, somewhat 

 expanded. Interior of aperture with a broad callus on the parietal wall, entering 

 about half a whorl and gradually becoming lower towards the interior and at the 

 aperture; on the outer wall, deep down, a transversal low lamella; at its upper 

 and lower ends a low callus extending halfway towards the lip. Dimensions: 

 Diam. 2, a, height 0,9 mm; whorls 4 ^/g. 



Radula (fig. 22) with about 65 rows of teeth, each row of the formula 

 7.3.1.3.7; length of radula 0,48, br. 0,13 mm. Median tooth with a small cusp 

 and two denticles; laterals with each a strong mesocone, and a small ectocone 

 and endocone of uniform size; marginals with larger denticles, the 6th and 

 succeeding with 2 ectocones. 



