227 



syphon. Variety, slightly curved and tapering with 

 eight not so much inflated^ joints, and covered with 

 tubercles rather than spines. . In fine sand. 



N. RADICULA. Lam. 1. NAUTILUS R. Lin. 1164. 

 D. p. 348. Mont. p. 197. t.G.f. 4. # t. 14./. 

 Q.Turt. D.p.l22Lin. T. 8. p. 119 ORTHOCERA 

 R. F. p. 236. Straight, opaque brown, the joints 

 transverse, smooth, usually eight or nine often less, 

 subglobose ; variable in respect to the terminal joint, 

 in some the aperture is extended to a conic point, in 

 others it is only a small round opening on the extreme 

 articulation which is globose ; the smaller end in some 

 is rounded, in others^conic and pointed, i Sandwich. 



GENUS SPIRULA. 



Cylindrical, thin, semitransparent multilocular , par- 

 tially twisted in a discoid spiral form, the whorls 

 disunited, the last produced in a straight line; 

 chambers transverse, equally distant, concave above, 

 with a lateral interrupted syphon; aperture or- 

 bicular. 

 S. PERONII. Lam 1 .S.AUSTRALIS. F. p. 227. 



Bit. 6./. \E. t. 465. /. 5. NAUTILUS SPIRULA. 



Lin. l\63.Mart.f. 184,5. D. p. 345. List. t. 



550./. 2.Gualt. t. 9. /. E.Knorr. 1. t. 2. f. 6. 



