TIEDEMANNIA. 57 



Species of Eurihia. 



Gaudichaudii, Eyd. and Soul. Norfolkensis, Qiioy and Gaim, 

 hemispherica, Rang. 



Genus PSYCHE, Rang. 



Body free, membranous, without any distinct head ; 

 tentacles none ; wings two, lateral, elongate, without any 

 intermediate lobe. 



Shell very thin and membranaceous. 



Ex. P. globulosa, Rang., pi. 7, fig. 1. 



This genus, established by M. Rang, has a cup-shaped, 

 membranous shell, and long lateral fins, but the animal 

 wants the intermediate lobe ; it is found in the sea near 

 Newfoundland. 



Genus TIEDEMANNIA, Delle Chiaje. 



Body gelatinous, transparent ; neck elongated ; tenta- 

 cles two,^ wings very large, cuneate, forming a disk ; 

 mouth below, surrounded by the lips. 



Shell none. 



Ex. T. Neapolitana, Delle Chiaje., pi. 7, fig. 2. 



This curious genus of Delle Chiaje has a transparent 

 gelatinous body, two tentacles, and two large wing-like 

 expansions which unite and form a disk ; it very much 

 resembles a Gymbulia without a shell : there are two spe- 

 cies known, one from the Bay of Naples, and the other 

 from New Holland. 



VOL. I. 



