AGLAIA. 27 



Ex. C. hirundinina, Quay and Gaimard, pi. 58, 

 fig. 3. Shell, C. hirundinina, fig. 3, a, 3, b. 



M. Quoy observes, that the animal on which this genus 

 is founded, swims by the aid of its mantle, which was the 

 case with a beautiful species observed by one of the 

 authors, also in the Mauritius, but which was so muti- 

 lated in the dredge, as only to afford the information, that 

 it was distinct from C. hirundinina. The individual 

 alluded to by M. Quoy, which " had the back crossed with 

 white, and all the blue lines bordered with a line of gold," 

 was probably a third species. We have examined a shell 

 which agrees with M. Quoy's species, and which was found 

 among the shells of Aplysice in Mr. Cuming's Collection. 



Genus AGLA.IA, Renier. 



Body depressed, posteriorly truncate. Head-disk 

 ovate, oblong, anteriorly retuse ; eyes none. Mantle 

 large, oblong, shorter than the foot ; gill on the right side 

 of the body. Foot expanded, ovately rounded, produced 

 anteriorly into a fleshy lobe. 



Shell internal, rudimentary, flat, triangular. 



Syn. Doridium, Meckel. Eidothea, Risso. Bullidium, 

 Meckel. Bullula, Agass. Akera, Cuv., not Mull. Acera, 

 Lam. Lobar ia, Blainv., not Midi. 



Ex. A. lineolata, H. and A. Adams, pi. 58, fig. 4. 

 Shell, A. depicta, Renier, fig. 4, a. 



This genus differs from the Posterobranchaa of M. 



D'Orbigny in the branchial plume being situated on the 



right side of the body towards the hind part. The 



Eidothea marmorala of Risso, or the Doridium aplysia- 



forme of Chiaje, is the same as the Aglaia depicta of 



