284 GASTROPODA. [Pectinihfi nr!i,,i. 



1, Calyptrsea scutum, Lesson, 1830. Plate 44, fig. 4. 



Calyptrcea scutum, Lesson, Voy. Coq., Zool., ii, 1830, 395 ; Man. Conch. (1), 

 viii, 122 ; Index, 79. Trochita scutum, Lesson : Hutton, J. de Conch., 

 xxvi, 30 ; M.N.Z.M., 86. Calyptrcea (Cli/peola) tennis, Gray, P.Z.S., 

 1867, 735. Trochita tennis, Gray, C.M.M., 32. 



Shell conoidal, with a nearly central elevated apex, circular or 

 slightly oval, thin and fragile. Sculpture consisting of oblique fine 

 radiate riblets, sweeping forwards in a long curve, and cut up into 

 small elongated tubercles by the growth-lines. Colour light brown 

 or cinereous. Epidermis very thin, horny. Spire conoidal towards 

 the base, conic and elevated towards the apex. Protoconcli small, 

 slightly oblique to the vertical axis, central or subcentral, consisting 

 of 1J to 2 convex, smooth, and deeply sutured whorls. Whorls about 

 4, very rapidly increasing, flatly convex. Suture inconspicuous. Aper- 

 ture entire, rounded, porcellanous, and shining ; margin thin and sharp. 

 Basal plate smooth and shining, with a few fine growth-striae, the 

 edge slightly concave, loosely coiled up, so as to leave a free space in 

 the centre, up which the apex can be seen. 



Diameter Maj., 23 mm. ; min., 20 mm. : height, 12 mm. (very 

 large specimen). Diameter Maj., 13mm.; xnin., 12mm.: height, 

 4 mm. (usual size). 



Animal unknown. 



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



Hob. Throughout New Zealand, in depths from 2 to 110 fathoms ; 

 Stewart Island, in 18 fathoms (Captain Bollons) ; Lyttelton Harbour, 

 in 2 to 4 fathoms (H. S.) ; Hauraki Gulf, in 4 to 25 fathoms (H. S.) ; 

 off Little Barrier Island, in 110 fathoms. Also Victoria (Gatliff). 



Remark. Sometimes the radiate riblets are absent. 



Fossil in the Pliocene. 



2. Calyptrsea alta, Hutton, 1885. Plate 44, fig. 2. 



Trochita alta, Hutt., T.N.Z.L, xvii, 1884 (1885), 329. Cnh/ptrmi ttlfn, Hutt., 

 Plioc. M., 62, pi. 7, f. 59 ; Suter, T.N.Z.L, xxxviii. 326. 



Shell rather large, solid, conical, high. Sculpture consisting of 

 oblique, close, rugose, elevated growth-strife. Colour yellowish-brown, 

 the summit sometimes purplish. Epidermis thin and horny. Spire 

 conical ; outlines convex. Protoconch small, of 1^ convex, smooth, 

 white, and polished whorls. Whorls 4, rapidly increasing, flatly convex. 

 Suture distinct, not much impressed. Aperture entire, subcircular, 

 polished. Basal plate white, shining, with oblique growth-lines ; margin 

 thin, sharp. Columella short, arcuate, slightly reflexed, and forming 

 a very narrow false umbilicus. 



Diameter, 25 mm. ; height, 16 mm. (type Miocene fossil). Dia- 

 meter Maj., 32mm.; min., 29mm.: height, 20mm. (Recent speci- 

 men). 



