MOLLUSCA FROM JUAN FERNANDEZ AND EASTER ISLAND 



227 



Fam. Endodontidae. 



Punctual depressum n. sp. PI. 8, figs. 24 — 26. — Shell depressed, with 

 slightly projecting spire, impressed suture and convex whorls, the last rounded 

 but obscurely angulated in the periphery. Base 

 slightly convex with a wide and deep perspective 

 umbilicus (its breadth almost half that of the last 

 whorl). Sculpture consisting of weak costae at 

 almost regular intervals, beginning in the second 

 whorl and extending also on the base to the 

 umbilicus, the entire shell, further, very minutely 

 and closely striated spirally. Apical whorl smooth. 

 Aperture almost circular (lips simple, not conti- 

 nuous), colour horn-brown, cuticula shining. Whorls 

 4. Dimensions: diam. 1,95, height 1,15 mm. 



This species is easily distinguished from the 

 following one in its more depressed shape, its 

 large umbilicus and circular aperture, as well as 

 in its more distinct spiral striation, and its costae. 

 Also in young specimens these characteristics are 

 quite distinct, but here the whorls are somewhat 

 shouldered, and the aperture is extended in its 

 height and is reniform in shape. 



Localities: Masatierra(Aug. 191 7): ThePorte- 

 zuelo quebrada, up to 200 m above sea level, among leaves and on ferns, many 

 sps. — Puerto Ingles, about 400 m, thick forest, many sps., and 300 m, thin 

 forest, numerous sps. ; 200 m, in leaves, numerous sps. — Puerto Frances, among 

 leaves on the soil, 3 sps. — In the bottom of Rabanal, about 100 m, numerous 

 sps. — Rabanal, down in the quebrada, under leaves, a few sps. — Pangal, on 

 ferns and under leaves, a few sps, — The Yunque quebrada, the middle part, 

 among leaves and in ferns, many sps. (figs. 24 — 26), and lower part, 2 sps. — 

 Masatierra {^^U 191 7) in leaves, 2 sps. 



The radula (text-fig. 4) has about icx) rows, each being of the formula 

 16 — 18. 1. 16— 18; all teeth bicuspid (except median one). The jaw (fig. 5) has 

 about 17 plates of the peculiar fibrous structure characteristic of Pjinctum. 



Figs. 4, 5. Teeth from the radula 



(X 730) and jaw(x 2'^o) oi Ptmctum 



dep7-essum n. sp. 



Punctum conicuni n. sp. PI. 8, figs. 18—23. — Shell depressed, globose- 

 conic, with narrow convex slowly increasing whorls and impressed suture, the 

 last whorl bluntly angulated at the periphery. Base slightly convex with a 

 narrow, but deep, umbilicus. Sculpture consisting of irregular raised lines of 

 growth, distinct on the upper side of the whorls, vanishing on the base towards 

 the umbilicus; the two apical whorls smooth. Aperture about half the height 

 of the shell, ovate, with acute simple outer and lower lips and a somewhat 

 thicker reflected columellar margin. Colour straw-yellow; cuticula shining. 

 Dimensions: diam. 1,05; height 0,7 mm; whorls 3 '/*. 



