98 EURYBIID. 
Famity HKURYBIID &. 
Animal short, rounded; head distinct, retractile into a pouch 
formed by a thickening of the mantle; wings long and narrow. 
Dentition 1:11 according to Macdonald, 1:0°1 according to Sou- 
leyet and Huxley. 
EurysiA, Rang, 1827. 
Ktym.— Eurybia, a seanymph. Syn.—Theceurybia, Bronn. 
Distr.—4 sp. Atlantic and Pacific. H. Gaudichaudi, Kyd. 
(xii, 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 
Pneumodermon. 
PSYCHE, Rang, 1825. (Halopsyche, Bronn, 1862.) Animal 
globular, with two simple oval fins, and no tentacles. P. globu- 
losa, Souleyet (xlii, 10). Off Newfoundland. 

ASPIDELLA, Billings, a very doubtful fossil from the Huronian 
of Newfoundland, has been referred to the Pteropoda by S. A. 
Miller in his Am. Pal. Fossils. A. terranovica, Bill. (xlii, 19). 
