.v.] GASTROPODA. 



Kam. FASCIOLARIIDJE, Adams. 



Animal having the foot rather broad and short, the head small anil 

 narrow, with short tentacles, the eyes at their outer bases. Central 

 tooth of the radula narrow ; lateral teeth large, multicuspidate. 



Shell fusiform, elongated ; spire short, conic ; canal long ; colu- 

 mella smooth or with plaits near the base ; outer lip simple. Operculum 

 corneous, oval, with the nucleus apical. 



KEY TO GENERA. 



A. Columella smooth . . . . . . . . . . FUSINUS. 



B. Coluniflla with a few l>asal plaits . . . . LATIBUS. 



(Jc.nus 1. FUSINUS, Rau'n<'st|iie. 1815. 



F-nsinux, Rafinesque, Anal, de la Nature, 1815, 145. Type : Murex coins, L. 

 Fusus, Bni.tiuiere, 1789 ; Lamarck, 1709 ; not of Helbling, 1779. Pseudo- 

 f us-us, Monterosato, 1884. Exilifusus, Gabb, 187<> ; not of Conrad, 186U. 



Foot short, quadrilateral, truncated, and \vith a transverse groove 

 anteriorly. Tentacles short, conical, joined posteriorly. Male organ 

 elongated, almost straight ; siphon not extending beyond the canal 

 of the shell. Radula triserial ; central tooth small, narrow, multi- 

 cuspidate ; lateral teeth large, pectiniform, multicuspidate. the cusps 

 long and narrow. 



Shell imperforate, fusiform, elongated ; spire long, acuminate, 

 many-whorled ; aperture oval, usually striate within ; outer lip 

 simple ; columella smooth ; canal long, straight, open. Operculum 

 ovate, acute, nucleus apical. 



Over sixty species are known, mostly from warm and temperate 

 seas. 



Fossil in the Secondary and Tertiary. 



1. Fusinus spiralis, A. Adams, 1856. Plate 41, fig. 4. 



Fusus spiralis, A. Ad., P.Z.S., 1855 (185<i), 221; Mutton, M.N.Z.M., 50; 

 T.N.Z.I., xvi, 227; Plioc. M., 40, pi. (5, f. 9; Tryon, Man. Conch. (1), 

 iii, 08, 227. pi. 85, f. 593. F. pensum, Button, C.M.M., 1873, 8. 



Shell fusiform, thin and fragile, whorls carinated and spinous.- 

 Sculpture consisting of 3 to 4 distant spiral threads upon the shoulder, 

 one below the keel on the upper whorls, increasing to three on the lower 

 whorls ; base and canal distantly spirally lirate ; growth-lines distinct, 

 fine and dense, slightly flexuous ; the sharp peripheral keel is pro- 

 duced into regular triangular spines on the spire-whorls, but they are 

 absent on the body-whorl, small tubercles taking their place. Colour 

 fulvous, with longitudinal flexuous bands of yellowish-white. Spin 

 high, narrowly conic, more than twice the height of the aperture ; 

 outlines gradate. Protoconch of 2 whorls, which are usually somewhat 

 tilted ; the first whorl large, angled, flat above ; the second whorl a 

 little narrower ; both smooth. Whorls about 10, sharply keeled at 

 the periphery, shoulder flat or slightly convex, the last whorl more 

 rounded, with the keel less prominent ; base contracted. Suture 



