MOLLUSCA FROM JUAN FERNANDEZ AND EASTER ISLAND 245 



Likewise, the male apparatus in Fernandezia is situated entirely above the 

 retractor oculi, and consists of a large appendix, though shorter than in the 

 genus mentioned. In half its length, this appendix carries a rounded diverticle 

 with thick walls folded inwardly, and the hind-end of the appendix is furnished 

 with a narrower flagellum attaining about the length of the preceding portion. 

 From the base of this flagellum there issues a strong retractor backwards; it 

 gives off a finer cord to the penis papilla, and then farther back inserts the 

 diaphragma; it does not join to the columellar muscle. 



The genital aperture is situated between tentacles and mantle margin, but 

 decidedly nearer to the latter. 



In a young specimen of Fernandezia bulimoides, which had not attained 

 sexual maturity, the vesicula seminalis was rather short and had the shape of 

 a flexed coecum, the end of which was embedded in the columellar muscle. 

 For this reason, it is evident that the shape and the direction of the vesicula 

 in the adult animal is a secondary acquisition peculiar to the Juan Fernandez 

 genera of Tornatellinidae, and no primitive character. 



Fam. Succineidae. 



Succinea fernandi Reeve. — Masatierra, Aug. 191 7: Tierras blancas, dead 

 on the sand, 3 shs., max. h. 9,7, whorls 3 V2. — El Puente, about 50 m above 

 sea, dead on the sand, 2 shs., max. h. 11, wh. 3^/2 (aperture wide). The shells 

 agree with Reeve's fig. 37 (Conch. Icon. 18) in their produced and contorted 

 spire, which is slender than in the following species; further, the apex is much 

 more minute, so that the number of whorls is greater in shells of equal size — 

 5, texta of 9,7 mm height has only 2 ^/a whorls. Also, the sculpture offers a 

 good distinguishing mark, inasmuch as the present species lacks the crossing 

 striation of ^. texta and exhibits only faint and irregularly running microscopic 

 spiral striae. The colour, further, is light yellowish. 



Succinea texta n. sp. PI. 9, figs. 50 — 52. — Shell oblong ovate, with 

 moderate spire (about half the aperture) rather solid, of a dull reddish-brown 

 or greenish horn colour. Whole surface sculptured with wavy microscopic 

 striae of two systems, each running obliquely to the lines of growth, and crossing 

 each other at about right angle; lines of growth forming irregular coarse, more 

 or less prominent, rugae. Maximum dimensions: height 18,5, h. of aperture 13,5, 

 br. 11,5 mm; whorls 3 V2. 



The texture-like sculpture (figs. 51, 52) of this species is very characteristic, 

 and serves to distinguish it from the preceding, from which it differs, further, 

 in its broader apex and rapidly increasing whorls. A similar sculpture is present 

 also in other species of Succinea, at least in some Pacific ones, such as 5. papil- 

 lata from Tahiti and ^. pudorina from Hawaii (specimens in RM.). 



This species may certainly be 6". fragilis King, mentioned by E. A. Smith 

 (1884), from Juan Fernandez, a species living in Hawaii, and different in its 

 broader spire; the coarse rugae are, however, similar. 



Localities: Masatierra, Aug. 1917: El Puente, dead in sand, 4 shs., max. 



