Atlnntti.} GASTROPODA. 353 



forming a small nucleus ; aperture oval, narrow, fissured ; peristome 

 simple, sharp. Operculum subtrigonal, with a small apical nucleus, 

 which is dextrally spiral. 



About forty species are known from the warmer parts of the 

 Atlantic, the Mediterranean, the Pacific. &c. 



Fragments of Atlanta were obtained in 110 fathoms oft' Great 

 Barrier Island, unfortunately too imperfect for specific determination. 

 (Hedley, T.N.Z.I., xxxviii. 7<>.) 



Fum. CARINARIID^I, Grasset. 



Animal having the visceral sac conical and small in proportion 

 to the rest of the body, which cannot be withdrawn into the shell : 

 foot elongated, fin-shaped, with a sucker, but without an operculum. 



Shell small in proportion to the size of tho body, symmetrical, 

 cup-shaped, thin and transparent. 



(Jenus I. CAR IN A ui A. Lamarck. 1801. 

 f.'iiriiuirid, Lain., Syst. A.s.V., 1801, 98. Type: ('. vitrtn. Lain. 



Animal elongated, fusiform : body smooth or granulated, gela- 

 tinous, semipellncid : head large, cylindrical, with 2 tentacles which 

 are slender and elongated, eyes near their outer bases ; ventral fin 

 rounded, with a marginal sucker ; posterior extremity of body laterally 

 compressed and terminating with 2 unequal tegumentary prolonga- 

 tions, one above and one below, which functionally are fins. Visceral 

 mass protected by the shell. The. branchiee are Triangular, numerous, 

 and extending beyond the margin of the shell. Anus and female 

 genital orifice on the right side of the nucleus ; the male copulatory 

 organ exserted on the right side of the body, immediately above the 

 ventral fin. 



Shell thin, hyaline, glassy, symmetrical, conical, compressed, 

 with a recurved apex, a minute dextrally-spiral nucleus, and a fim- 

 briated dorsal keel ; aperture large, ovate, entire. 



Eight species are known from the Mediterranean, Atlantic, Indian 

 Ocean, the seas of China, and Tasman Sea. 



Fossil. Two species from the Miocene of Piedmont. 



The food of the genus most likely consists of small Scyphomedwce 

 and Pteropods. 



1. Carinaria australis, Quoy and Gaimard. 1833. Plate 17. 

 fig. 20. 



Carinaria australis, Q. & <!., Vo\ . Astrol., ii, 1833, 394, pi. 29, f. 9-15 : Gray, 

 in Dieff. N.Z., 244; Mutton, C.M.M., (i ; M.N.Z.M., 118; Crit, List. 

 38; Verco, T.R.8. S.Aust.. xxix, 171. 



Shell thin, hyaline, with broad and rather deep concentric grooves : 

 apex obliquely inclined ; dorsal keel undulated by the grooves extend- 

 ing over it. Aperture oval, slightly angled anteriorly. 



12 Moll. N./. 



