174 PERCY SLADEN TRUST EXPEDITION 



6. Atlanta helicinoides Souleyet. 

 Stat, u (l), Farquhar. 



7. Atlanta turriculata d'Orbigny. 

 Stat. P (1), Chagos Archipelago. 



8. Atlanta inclinata Souleyet. 



Stat. N (1), Chagos Archipelago ; q (2), u (3), Farquhar ; nn (2), Amirante Group. 



9. Atlanta gibbosa Souleyet. 

 Stat, u (2), Farquhar. 



Carinariidae. 



Carinaria Lamarck. 



10. Carinaria sp. 



"Investigator" specimens: 12° 20' N., 85° 8' E., 1803 fms, one small broken shell; 

 7 miles S.E. by E. of Ross Island, 265 fms, 1 sp. 



This last specimen, of a length of about 30 mm., had lost nearly all its shell, only a 

 few broken fragments adhering to the visceral nucleus, which itself was greatly damaged ; 

 the actual form of the shell could not be made out. The animal was preserved in weak 

 alcohol and was consequently very liable to damage by any manipulation. It showed 

 a huge proboscis and a small rounded fin with a sucker at the usual place in Carinaria, 

 viz. at the distal margin, near the base. The eyes had the general shape of those of 

 Pterotrachea s.s., a character not previously, so far as I know, met with in Carinaria, the 

 left eye exhibited a small tentacle at the inner side. The visceral nucleus, or rather its 

 remnants, was highly elevated. 



The shell from the other locality showed in the form and disposition of the spire some 

 resemblance to C. cithara Benson, recorded from the Indian Ocean, but it could not 

 be determined with certainty. 



Pterosoma Lesson. 



I take this opportunity of rectifying some mistakes in my former notes about the 

 history of this genus*, the literature of which I had no opportunity of studying at that 

 time. 



The genus was established by Lesson t and a few years later redescribed by the same 

 author J in a manner which clearly shows his opinion about its affinity to Pterotrachea, 

 as is proved by the following passage : " un animal fort remarquable, tres voisin des 

 firoles§." The damaged condition of his specimens did not enable Lesson to give an 

 accurate description and reliable figures, so it is not at all astonishing that only about forty 



* Die Heteropoden der Siboga-Expedition, Siboga-Hxpeditie , Monogr. li. 1906, p. 21. 

 t Mem. de la Soc. d'Hist. Nat. de Paris, t. 3, p. 414, PI. x. fig. A, 1827. 



\ Voyage autour du monde de la " Coquille," Zool. par M. Lesson, T. ii. pp. 254 — 256, PI. in. tig. 3, 3 bis. 

 § So I have been wrong (I.e.) in stating that Lesson had not recognized the true systematic affinity of 

 I'terosuma with other Heteropods. 



\ 



