13 



concentriques vers le centre". If this proves to be true, we must entertain some doubts whether 

 Atlanta rotunda is even a "Pteropod". Munthe lias regarded it as [a distinct species (see 

 the list above of synonyms) but it was referred by Pelseneer ') to the genus '^ Agadina\ 



As to Atlanta rangii, it differs so very slightly from Limacina lestceurii, that it cannot 

 be regarded as a distinct species, as Munthe (see above) •) has done. The umbilicus is only 

 somewhat wider, quite as in Spirialis ventricosa. 



3. Limacina trochifonnis (d'Orbigny). 



1836. Atlanta trockiformis d'Orbigny, Voyage dans I'Amerique meridionalc, vol. V, p. 177, 



pi. XII, figs. 29—31. 

 1840. Spirialis trockiformis Eydoux et Souleyet, Description sommaire de quclques Pteropodes 



nouveaux ou imparfaitement connus, Revue Zoologique, vol. Ill, p. 237. 

 1850. Limacina trockiformis Gray, Catalogue of the Mollusca in the collection of the British 



Museum, Prt. II, Pteropoda, p. n. 

 1852. Limacina naticoides Rang, Histoire naturelle des Mollusques Pteropodes, pi. X, figs. 1—2. 



Living animals: 



Stat. 59. 10° 22'. 7 S., 123° i6'.5 E. Western entrance Samau Strait. 2 spec. 



Stat. 121. i°33'.7N., i24°46'.5 E. Menado. i spec. 



Stat. 138. o°23'.8N., 127° 29' E. East-coast of Kajoa Island. i spec. 



Stat. 148. o''i7'.6S., I29°I4'.5E. x spec. 



Stat. 203. 3°32'.5 S., I24°I5'.5E. i spec. 



Stat. 214. 6° 30' S., 121° 55' E. 2 spec. 



Nothing can be remarked about the geographical distribution of this species. It seems 

 rarer than Limacina iiifiata. 



No tentacular lobe on the dorsal margin of the fin. 



4. Limacina bulimoides (d'Orbigny). 



1S36. Atlanta bulimoides d'Orbigny, Voyage dans I'Amerique meridionale, vol. V, p. 179, 



pi. XII, figs. 36— 3S- 

 1840. Spirialis bulimoides Eydoux et Souleyet, Description sommaire de quelques Pteropodes 



nouveaux ou imparfaitement connus. Revue Zoologique, vol. Ill, p. 238. 

 1850. Limacina bulimoides Gray, Catalogue of the Mollusca in the collection of the British 



Museum, Prt. II, Pteropoda, p. 34. 

 1889. Limacina (Meter of usus) bulimoides Dall, in: Bullet. U. S. Nat. Mus., n" 37, p. 80. 



Living animals: 



Stat. 138. o°23'.8N., 127° 29' E. East coast of Kajoa Island, i spec. 



Stat. 143. 1° 4.5 S., i27°52'.6E. I spec. 



Stat. 148. o°i7'.6S., 129° 14.5 E. 10 spec. 



Stat. 243. 4°3o'.2 S., 129° 25' E. 2 spec. 



Like the foregoing species. 



Some slight difference in size among the individuals may be noticed. 



No tentacle-like lobe on the anterior fin margin. 



1) Challenger Report LXV, p. 40. 



2) It may be remarked, that the figure of Munthe shows the margins of the shell thickened, while d'Orbigny says: "bords tranchants". 



