282 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



LEUCKARTIARA OCTONA (Fleming) Hartlaub. 

 Plate 39, figs. 5, 6. 

 Oeryonia octona Fleming, 1823, p. 299. Synonymy, Hartlaub 1913, p. 285. 

 Leuckartiara octona — material examined. 



I formerly (1909a) believed that the Pacific Leuckartiara described 

 by Maas (1909) and by me (1909a) as Tiara papua Lesson, but prob- 

 ably incorrectly, as Hartlaub (1913, p. 331) points out, 1 could be dis- 

 tinguished from the Atlantic L. octona by the presence of fewer ten- 

 tacles. But Vanhoffen has recently (1912) recorded Pacific speci- 

 mens of the characteristic " octona " type ; hence it can no longer be 

 maintained that the final number of tentacles is always smaller in 

 the Pacific than in the Atlantic form. But most of the Pacific speci- 

 mens recently recorded have only eight or fewer tentacles, irrespec- 

 tive of size, as shown in the following table : 



The present collection gives the following data : 



Locality. 



Philippines . 



.do. 

 .do. 

 .do. 



do... 



do... 



do... 



do... 



Size 

 (mm.). 



6 high. 



6 high. 

 6 high. 

 5 high. 



4 high. 



4 high. 



5 high . 

 5 high. 



Large 

 tentacles 



Gonads. 



Present . 



Present, large. 



Present 



do 



do. 



do. 



do. 



do. 



Small tentacles 

 and bulbs. 



4 small and 8 



knobs. 

 8 knobs. 



8 knobs. 



3 small and 8 

 knobs. 



6 small and 7 



knobs. 

 6 small and 7 



knobs. 



4 small and 8 

 knobs. 



9 knobs. 



1 Hartlaub, 1913, p. 334, shows that the Turris papua of Lesson and of Eydoux and 

 Souleyet Is a Neoturrie. 



