GASTEROPODA. 277 
Figure 345, shell, with the animal extended. 
Found at Raraka, Paumotu Islands. Couthouy. 
Mirra vireata (Reeve), Proceed. Zool. Soc., 1844. Conch. Icon., 
fig. 197. M. retusa, var. Gray. 
Anima much like that of M. retusa; foot narrow, elongated, with a 
distinct, transverse, marginal fissure; above ferruginous, white at 
margin; base of siphon and tentacles colourless, the former tipped 
with rufous ; foot beneath pale blue. 
Found at Clermont Tonnerre, Paumotu Islands. 
Figure 346, shell, with the animal, as when in motion; 346 a, loco- 
motive disk. 
Mirra Macutosa (Reeve), Conch. Icon., figs. 175, 194. Marrini, 
Conch. Cab., pl. 150, f. 1400. 
Anima milk-white beneath ; tentacles cream-coloured. 
Figure 347, animal, with the shell, seen from beneath. 
Mirra noposa (Swainson), Philos. Mag. Reeve; Conch. Icon., f 
196. M. fraga, Quoy and Gaim.; Astrol., pl. 45, f. 28, 29. Lamarck ; 
Anim. sans Vert., x. 349.  M. tuberculata, KieNner ; Iconog., fig. 87. 
ANIMAL opaque-white, except on the siphon, where it is yellowish ; 
head small, tentacles of moderate length, eyes conspicuous, on a lateral 
enlargement at their lower third; siphon rather large, and constantly 
moving as in Nassa, to which this genus is closely allied. Motions 
quite active. No operculum detected. 
Common on coral ledges, Clermont Tonnerre. [J. p. c. ] 
70 
