13 



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

 Atlanta rotiuida is even a "Pteropod". Munthe has regarcled 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 leszteurii, 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 trochiformis (d'Orbigny). 



1836. Atlanta trochiformis d'Orbigny, Voyage dans l'Amérique meridionale, vol. V, p. 177, 



pi. XII, figs. 29—31. 

 1840. Spirialis trochiformis Eydoux et Souleyet, Description sommaire de quelques Ptéropodes 



nouveaux ou imparfaitement connus, Revue Zoölogique, vol. III, p. 237. 

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



Museum, Prt. II, Pteropoda, p. 33. 

 1852. Limacina naticoides Rang, Histoire naturelle des Mollusques Ptéropodes, pi. X, figs. i — 2. 



Living animals: 



Stat. 59. 10° 22'. 7 S., 123° 16'. 5 E. Western entrance Samau Strait. 2 spec. 



Stat. 121. i°33'.7N., 124° 46'.$ 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 inflata. 



No tentacular lobe on the dorsal margin of the fin. 



4. Limacina bulimoides (d'Orbigny). 



1836. Atlanta bulimoides d'Orbigny, Voyage dans l'Amérique meridionale, vol. V, p. 179, 



pi. XII, figs. 36—38. 

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



nouveaux ou imparfaitement connus. Revue Zoölogique, vol. III, p. 238. 

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



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

 1889. Limacina (Heter of usus) bidimoides 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. 0° I7'.6 S., 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-Hke lobe on the anterior fin margin. 



i) 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". 



