CREPIDULA. 247 



Shell elongate, dorsal aspect much elevated, high-convex, 

 contot'tcd, fi-equently assuming the shape of the object it grows 

 upon ; internal lamina stout, extending over about one-half of the 

 aperture. 



DiiiietiHions. — Height 16 mm.; length of aperture 33 mm.; 

 breadth 22-5 mm. 



Form, and Loc. — Miocene and Post-Pliocene : Victoria and New- 

 Zealand. 



G. 5574. Two examples of the adult ; Limestone Creek, 

 Glenelg river. Purchased. 



G. 9621. Decomposed shells in coarse grit; from Port Hills, 

 Nelson. Sir James Hector Coll. 



G. 9567. Two internal casts of the adult ; from Awatere. 



Sir James Hector Coll. 



Crepidula aculeata, Gmelin (sp.). 



1790. Patella acnkata, Gmelin, Linn. Syst. Nat. p. 3693. 



183t. Crepidula costata, Quoy and Gairaard, Voy. de I'Astrolabe, Zool. t. iii. 



p. 414, pi. Ixxii. tigs. 10, 12. 

 1836. Crepidula costata, Deshayes, Lamarck, Hist. Nat. Anim. sans Vert. 



t. vii. p. 644. 

 1873. Crepidula costata, Von Martens, List Moll. N.Z. p. 28. 

 1873. Crypta costata, Hutton, Cat. Marine Moll. N.Z. p. 32. 

 1873. Crypta costata, Ilutton, Cat. Tert. Moll. N.Z. p. 14. 

 1880. Crypta costata, Hutton, Man. N.Z. Moll. p. 87. 

 1886. Crepidula {Crypta) aculeata, Tryon, Manual of Conchology, vol. viii. 



p. 129, pi. xxsix. figs. 61-5. 

 1893. Crepidula aculeata, Hutton, Linn. Soc. N.S.W., Maeleay Mem. Vol. 



p. 62. 



Shell ovate, not so deeply convex as C. tnono.v>/la, apex lateral ; 

 surface covered with radiating ridges of variable character, for 

 the most part spinose or prickly in the examples now living, 

 somewliat more simple in the fossil state, apparently. The sub- 

 genus Crypta of (Humphrey) Gray, Fischer, etc., was suggested 

 for those Crepidula with a spinose surface — a variable feature 

 having but little importance, at any rate, from a sectional point 

 of view. 



Dimensions. — Height 12 mm.; length of aperture 26 mm.; 

 breadth 16-5 mm. 



