39 



4 



divero-ence of the lateral margins, and the direction of the terminal point, which docs not exhibit 

 the strong curvature of Cavolinia uncinata at all, but is almost straight (I'l. II, figs. 32 — 33). 

 The variety afflnis in its most extreme forms, had been recorded already from the Plast- 

 Pacific Ocean (Boas, Spolia atlantica, p. 116). 



The variety triiiicata of this author (South- Atlantic and western part of Indian Ocean) 

 w^as not found among the Siboga-specimens. 



4. Cavolinia uncinata (Rang). 



1836. Hyalaea uncinata Rang, in: d'OrbigNY, Voyage dans FAmeriquc meridionalc, vol. V, 



p. 93, pi. V, figs. II— 15. 

 1S50. Cavolina uncinata Gray, Catalogue of the Mollusca in the Collection of the British 



Museum, prt. II, Pteropoda, p. 7. 

 1880. Hyalaea uncinatifonnis Pfefter, Die Pteropoden des Hamburger Museums, Abh. aus d. 



Geb. d. Naturvv. herausg. vom Naturw. Ver. Hamburg, Bd. VII, p. 83. 

 1888. Cavolinia uncinata Pelseneer, Chall. Rep. LXV, p. 84. 



Living animals: 



Stat. ii7-\ i°i5' N., 1 23° 37' E. 3 spec. 

 Stat. 303. Haingsisi, Samau Island. i spec. 



Empty shells: 



Stat. 45. 7° 24' S., ii8°i5'.2E. I spec. 



Stat. 52. 0° 3'.4 S., ii9°56'.7E. 10 spec. 



Stat. 59. io°22'.7 S., i23°i6'.5E. 2 spec. 



Stat. 6^\ 7° o' S., i2o°34'.5E. 2 spec. 



Stat. 88. o°34'.6N., 119° 8'.5 E. 31 spec. 



Stat. 90. 1° I7'.5 N., 118° 53' E. i spec. 



Stat. 95. 5°43'.5 N., ii9°4o' E. 15 spec. 



Stat. 102. 6° 4'. I N., 1 20° 44' E. 14 spec. 



Stat. 105. 6° 8' N., 121° 19' E. i spec. 



Stat. 117". i°i5' N., 123° 37' E. I spec. 



Stat. 136. Ternate. i spec. 



Stat. 137. o°23'.SN., 1 27° 29' E. 7 spec. 



Stat. 139. o°ii' S., 127° 25' E. 2 spec. 



Stat. 151. o°i2'.6 S., i29°48' E. 4 spec. 



Stat. 159. 0°59'.i S., 129° 48'. 8 E. 17 spec. 



Stat. 178. 2°4o' S., 128° 37'. 5 E. 32 spec. 



Stat. 208. 5° 39' S., 122° 12' E. 9 spec. 



Stat. 212. 5°54'.5 S., 120° 19'. 2 E. 8 spec. 



Stat. 221. 6° 24' S., 124° 39' E. 2 spec. 



Stat. 267. 5° 54' S., 1 32° 56'. 7 E. I spec. 



Stat. 300. io°48'.6 S., i23°2 3'.iE. 2 spec. 



Stat. 312. 8° 19' S., ii7°4i' E. i spec. 



Cavolinia nncinata^ chiefly represented by empty shells, is a ver\' common tcjrm. 



Some specimens are remarkably hyaline, but in the sculpture of the shell, the curvature 

 of the posterior point, as well as in the direction and size of the lateral spines, all the 

 specimens are very much alike. 



