MOLLUSCA FROM JUAN FERNANDEZ AND EASTER ISLAND 241 
Frernandezia is perhaps to be considered as a secondary appearance, arisen by 
means of reduction from a Yornatellina stage. 
PILSBRY (1911, Man. of Conch., Vol. 21) has described some new species 
of the genus. Only three of the previously known ones were collected by the 
Swedish expedition; to these comes one new, the smallest hitherto known, 
remarkable for its polygyrate shell. The second species, with its strikingly small 
aperture, proves to agree with /. ¢ryonz (PILSBRY, pl. 14, fig. 12), the third, 
and largest species, corresponds to /’. bulimoides Reeve (incl. consimilis Reeve, 
which seems merely to be the narrow variety), as well as to PFEIFFER’s figure 
of F. splendida in the Conchylien Cabinet (cf. PILSBRY, pl. 14, fig. 10). The 
fourth species corresponds well to the figure of /. splendida Anton, given by 
REEVE (Conch. Icon. V, f. 100) and, though less exactly, to that given by 
PFEIFFER in 1847 (cf. PILSBRY, pl. 14, f. 9). 
The difference between the two last-named forms is involved in the rapidly 
increasing whorls of the former (udzmozdes) which render the shell, at least in 
young specimens, a convex outline, a globose shape and a relatively large 
aperture (about half the height ‘of the shell), whereas /. sp/endida has the 
whorls more slowly increasing by which the spire grows more produced and 
straight and the aperture smaller (less than half the shell height). The difference 
is most obvious in young shells, which differ considerably in size; a stage of 
4 whorls measures in height 3,2 mm in sflendida, and 5,1 in bulimoides. The 
adult stage with 5*/2 whorls measures, in the former, 7 mm in height, 3,8 mm 
in breadth, in the latter 1o and 6 resp. The ratio height to breadth is, more- 
over, as variable as in 7ornatel//ina, a feature common to all species of the genus. 
Fernandezia bulimoides Pfeiffer. Pl. 9, fig. 47. — Masatierra, Aug. 1917: 
Rabanal, down in the quebrada, under leaves, numerous empty shells, and some 
living sps., max. h. 10; wh. 5, and about 300 m above sea, 2 small shs. — 
Puerto Ingles, about 200 m, among leaves, I small sp., and about 400 m, thick 
forest, some fragments and small sps. — Round Portezuelo, 570 m, on ferns, 
some young shs. — The Portezuelo quebrada, up to 200 m, among leaves and 
on ferns, some young sps. — Centinela Ridge, about 500 m, under leaves and 
on ferns, 10 shs., h. about 10, and about 650 m, under ferns, 1 fragment. — 
Masatierra, 7/1 1917, on ferns, some young sps.; */4 1917, about 500 m, shaken 
down from bushes, 8 sps., max. h. 10,5; 7°/4, 1 small sp., among leaves; **/12 
1916, some small sps. — Beneath Damajuana, about 300 m, thick forest, among 
leaves, 3 shs., max. h. 10,5, fig. 47. 
Fernandezia splendida Anton. Pl. 9, fig. 48. — Masatierra, Jan.— April 
1917, many sps., max. h. 6, wh. 5 */2—6; Aug. 1917: about 500 m above sea, 
shaken down from bushes, some small sps., together with /. dulmozdes. — 
Salsipuedes Ridge, about 350 m, on ferns and beneath leaves, many sps., max. h. 
about 6,8, wh. 5 ?/s, fig. 48. — Piedra Agujeriada Valley, 1 small sh. — The 
Portezuelo quebrada, up to 200 m, among leaves and on ferns, 3 shs., max. h. 6,4, 
wh. 5. — Round Portezuelo, 570 m, on ferns, 4 shs., max. h. 5,3. — Pangal, 
on ferns and under leaves, I sp., h. 6,55. — Below Damajuana, in thick forest, 
about 300 m, 2 shs., max. h. 3,5. 
16 — 21197. The Nat. Hist. of Juan Fernandez and Easter Isl. Vol. III. 
