HALIOTIS. 33 



antice fere obsoletis, costa subcentrali baud tantura elevata, 

 area marginali vix costata. — The more striking characters of 

 //. ruhiGUuda are present in tliis species in a smaller degree, 

 but the raised laminae connecting the suture with the sub- 

 central rib are only seen in the earlier whorls of the shell. 



69. PARVA, f. 17, Linnceus. — Testa aurantia fusco-viridis 

 aut variegata, ovato-depressa, medio subexcavata, tum costa 

 cincta, margine tuberculifero prominenti, area marginali ex- 

 cavate, margine unicostato. — Of various patterns as to colour, 

 this shell exhibits the peculiar character which connects it with 

 the ' padollus ' group ; namely the spiral rib in the centre of 

 the disc. 



70. LAUTA, f. 15, Reeve. — Testa subovata, depressa, antice 

 attenuata, spiraliter striata, medio leviter unicostata ; spira 

 latiuscula, decumbenti. — In this species the central rib is but 

 slightly shown. 



71. Brazieei, f. 43, 114, Angus. — Testa rotunda subconi- 

 planata laevi rubra vel rubro variegata, medio tumida vel 

 costa spirali subobscure cincta, foramiuibus magnis erectis 

 tubulosis spira rotunda lata subcentrali. — The specimen 

 figured in the zoological proceedings seems, instead of pre- 

 serving the smooth rounded equal-coloured form of our 

 museum shell, to have developed into a shell somewhat 

 resembling //. lautd, with variegated colouring and rather 

 strontf central rib. 



