Calyptrcea.] GASTROPODA. 285 



Animal unknown. 



Type in the Canterbury Museum, Christchurch. 

 Hob. Cape Maria van Diemen (McGahey) ; Manukau (fide W. H. 

 Webster). 



Fossil. Miocene and Pliocene. 



Subgen. 2. SIGAPATELLA, Lesson, 1830. 



Sigapatella, Lesson, Voy. Coq., Zool., ii, 389. Haliotoidea, Swainson, 1840. 

 ' Trochdla, Gray, 1867. Calyptropsis, Tate, 1893. 



Shell oval, with lateral apex ; basal plate with submarginal axis ; 

 the free margin concave. 



3. Calyptraea maculata, Quoy and Gaimard, 1835. Plate 14, 

 figs. 3, 3a. 



Crepidtilit maculata, Q. & G., Voy. Astral., iii, 1835, 422, pi. 72, f. 6-9. 

 Calyptrcea novce-zelandice, Lesson, Voy. Coq., 1830, ii, 395. C. dilatata, 

 Sow. : Gray, in Yate N.Z., 308, and Dieff. N.Z., 243. Trochita maculata, 

 Q. & G., Crit. List., 28. T. novce-zealandice, Less. : Hutton, J. de Conch., 

 1878, 30 ; M.N.Z.M., 86 ; Conch. Icon., Trochita, xi, pi. 3, f. 15. Galerus 

 neozelanicus, Less. : Hutton, P.L.S. N.S.W., ix, 938. Calyptrcea calyptrce- 

 formis, Lam. : Tryon, Man. Conch. (1), viii, 122, pi. 35, f. 98, 99 ; not of 

 Lamarck. C. novce-zeelandice, Lesson : Suter, T. N.Z.I., xxxviii, 326. 



Shell rounded, convex, rather thin, with a lateral summit. Sculp- 

 ture consisting of well-marked, fiattish, and rugose growth-lines. Colour 

 greenish-yellow to light brown ; interior white, a large spot of purple 

 or purplish-brown near the centre. Epidermis thick, horny, lamellate 

 in the direction of the growth-periods, and produced into rays and 

 ragged processes. Spire small, conic, salient, lateral, and posterior. 

 Protoconch small, of 1J convex whorls, the first smooth, the following 

 half with a few microscopic growth-lines and spiral stria?. Whorls 

 3 to 4, convex, the last very large. Suture superficial. Aperture 

 roundly oval, entire, polished. Basal plate white, with very fine 

 growth-lines, the free margin thin, sharp, lightly concave. Columella 

 lateral, dilated at its insertion, and furnished with a triangular lamina, 

 which partly hides the rather wide false umbilicus. 



Diameter Maj., 33 mm. ; rnin., 28mm.: height, 10mm. (large 

 specimen). 



Dentition. Hutton, T.N.Z.I., xiv, 163, pi. 7, f. A. 



Type in the Mus. Hist. Nat., Paris. 



Hab. Throughout New Zealand and at the Chatham Islands. 

 Brought to England by Captain Cook. 



Remarks. The species was first figured by Quoy and Gaimard, 

 and their name therefore stands in preference to the earlier name of 

 Lesson. Young shells have mostly the basal plate white, and the 

 whole roof purplish-brown. The height of the shell is very variable. 



Fossil. Miocene and Pliocene. 



