98 EURYBITDiE. 



Family EURYBIID^. 



Animal short, rounded ; head distinct, retractile into a poucli 

 formed hy a thickening of the mantle ; wings long and narrow. 

 Dentition I'l'l according to Macdonald, 10*1 according to Sou- 

 ley et and Huxley. 



EuRYBiA, Rang, 182'7. 



Etym. — Eurybia, a sea-nymph, Syn. — Theceurybia, Bronn. 



Distr. — 4 sp. Atlantic and Pacific. E. Gaudichaudi, Ej^d. 

 (xlii, 16). 



Animal globular; fins narrow, truncated, and notched at the 

 ends, united ventrally by a small lobe (metapodium) ; mouth 

 with two elongated tentacles, behind which are minute eye- 

 peduncles and a two-lobed rudimentary foot (mesopodium) ; 

 body enclosed in a cartilaginous integument, with a cleft in front, 

 into which the locomotive organs can be retracted. 



The animal has no proper gill, but Mr. Huxley has observed 

 two ciliated circles surrounding the body, as in the larva of 

 Fneumodermon. 



PSYCHE, Rang, 1825. (Halopsyche, Bronn, 1862.) Animal 

 globular, with two simple oval fins, and no tentacles. P. glohu- 

 losa, Souleyet (xlii, 10). Off Newfoundland. 



ASPiDELLA, Billings, a very doubtful fossil from the Huronian 

 of Newfoundland, has been referred to the Pteropoda b}^ S. A. 

 Miller in his Am. Pal. Fossils. A. terranovica, Bill, (xlii, 19). 



