9 6 



3. Acmaea saccharina Linné. 



LlNNÉ. Syst. Nat. Ed. X, p. 781, N° 660. 

 RUMPH. Amb. Rariteitkamer, p. 121, PI. 40, fig. B. 

 Reeve. Conch. Ie. Vol. VIII, Patella, fig. 72. 



PlLSBRY. Man. of Conch. Vol. XIII, p. 49, PI. 36, figs. 60—62, 78; PI. 18, figs. 31, 32; 

 PI. 24, figs. 12, 13. 



Stat. 16. Bay of Kankamaraan, South coast of Kangeang. Shore. 6 Spec. 

 Stat. 60. Haingsisi, Samau. Reef. 1 Spec. 



Stat. 125. Sawan, Siau-island. Reef. 1 Spec. 



Stat. 127. Taruna-bay, Great Sangir-island. Reef. 1 Spec. - 



Stat. 131. Beo, Karakelang-island. 13 M. Mud and sand. 1 Spec. 



Stat. 152. Wunoh-bay, N. W. coast of Waigeu-island. Reef. 1 Spec. 

 *Amboina. 1 Spec. 



The specimen from Stat. 152 resembles the figure of var. stellaris O. & G. but has no 

 dotted central area, as represented in the figures of Pilsbry (1. c. pi. 36, figs. 63, 64, 67, 68); 

 if this be the only distinguishing character, it seems to be of very little importance. The specimen 

 has the same rounded, conspicuous ribs as in the original figure, but is much smaller and has 

 a rather juvenile appearance. In some of the specimens from Stat. 16 I see a few brown dots 

 in the central area, but they have no prolonged ribs. 



Pectinodonta Dall. 

 1. Pectinodonta orientalis n. sp. PI. II, fig. 8. 



Stat. 88. o°32'S., uc/S'^E. 1301 M. Fine grey mud. 1 Spec. 



Shell elongate-ovate, elevated, yellowish-white, anterior slope the shortest, nearly straight 

 but slightly convex near the middle, more so near the margin, with a small concavity near the 

 apex, posterior slope conspicuously convex, side slopes irregularly convex. Apex blunt, nearly 

 smooth, save for very fine growth-lines and a few microscopic hairlines; nucleus placed at about 

 5 / 18 of the length, deciduous. Sculpture consisting of more or less crowded, slightly wavy, radiating 

 ribs or threads, wanting at irregular spaces ; they are crossed by rather regular concentric lirae, 

 slightly stronger than the radii, with very fine striae in the interspaces. Margin rather thick, 

 the whole shell solid, slightly raised in the middle, so that if the shell be placed on a level 

 surface, it rests upon the ends. Inside as far as visible, smooth. 



Long. 18, lat. 13, alt. 9 Mill. 



This shell may easily be clistinguished from the only species that was known; it is higher 

 with much coarser sculpture, and the posterior slope is much less convex and shorter in 

 proportion to the whole length of the shell. The great depth at which it has been found, 

 together with the external characters of the animal, which has a large head and no eyes, induced 

 me to bring the species to the genus Pectinodonta, which was only known from the western 

 Atlantic. Still I should have hesitated, were it not that the small specimens, enumerated sub 

 N° 3, had produced the characteristic dentition of that genus. 



96 



