43 



Stat. 95- 5°43'.5N., 119° 40' E. 22 spec. 



Stat. 102. 6° 4'.iN., i20°44' E. 17 spec. 



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



Stat. 137. o°23'.8N., 127° 29' E. 3 spec. 



Stat. 139. o°ir S., I27°25' E. 2 spec. 



Stat. 151. o'^i2'.6S., 129° 48' E. 5 spec. 



Stat. 178. 2°40' S., 128° 37'. 5 E. 4 spec. 



Stat. 211. 5°4o'.7 S., i20°45'.5 E. i spec. 



The species is very abuntlantl\- distributed over the whole region. 



No other species exhibits so maiiy variations. X'ery striking is the difference in size 

 among the specimens themselves. The lateral points of the small-sized intlividuals are generally less 

 developed, the dorsal lip is not prolonged into a rostrum, and the shell is hyaline. In the larger 

 specimens, however, the lateral points are more conspicuous, while the rostrum is long, and 

 the shell coloured whitish. These characters are not absolutely connected with the size, and the 

 opinion, according to which the small specimens represent young stages, is erroneous, as Bo.\s ') 

 pointed out. They are adult individuals, like the large ones, which will not grow further. 



Hyalaea angulata -Souleyet was found at nearly every station from which Cavolinia 

 longirostris has been recorded. But the transitions to this form are so numerous too, that it 

 is impossible to regard the species of Soulfa'ET as a distinct one. 



BoAS ') described a variety, in which the lateral points are more or less curved upwards. 

 Some specimens of the collection, gathered by the Siboga, agree with his description (Stat. 102), 

 but here too, grradual transitions make it almost impossible to maintain the clistinctness of 

 this variety. 



I may remark further that a small brown spot sometimes occurs on the dorsal side of 

 the shell, just above the closing apparatus, while the strong dorsal median rib also exhibits a 

 brownish colour of more or less extension. These characters, not in any way connected with 

 any other constant peculiarity of the shell, do not allow me to make a new variety. 



8. Cavolinia inflcxa (Lesueur). 



1S13. Hyalaea inflcxa Lesueur, Mémoire sur quelques aniniaux Alollusques, etc, Nouv. Bullet. 



Soc. Philorn., vol. III, p. 2S5, pi. V, fig. \,A,B,C,D. 

 1821. Hyalaea elongata Lesueur in: DE Blainville, Dict. d. Sc. Nat., vol. XXII, p. 82. 



1835. Hyalaea vaginellina Cantraine, Bullet. Acad. d. Sc, Bruxelles, vol. II, p. 380. 



1836. Hyalaea lalnata d"Orbigny, Voyage dans l'Amérique meridionale, vol. V, p. 104, 



pi. VI, figs. 21 — 25. 

 1836. Hyalaea uncinata Höninghaus in: Philippi, Enum. Moll. utriusque Siciliae, vol. I, 



p. loi, pi. VI, fig. 18. 

 1841. Hyalaea vaginella Cantraine, Malac médit., p. 28, pi. I, figs. 6 — 6a. 

 1850. Cavolina iuflexa Gray, Catalogue of the Mollusca in the collection of the British 



Museum, prt. II, Pteropoda, p. 9. 

 1877. Hyalaea (Diacria) inflexa Sowerby, in: Reeve, Conch. Icon., vol. XX, Pteropoda, 



pi. III, figs. \-ja — \]b. 

 1877. Hyalaea (Diacria) labiata Sowerby, Ibid., figs. \'i>a — 18^. 



1) Spolia atlantica, p. 102. 



2) L. c. s. 103. 



