224 
syphon.—Variety, slightly curved and tapering with 
eight notso much inflated joints, and covered with 
tubercles rather than spines. ¢. In fine sand. 
N. Rapicuna. Lam. 1.—Navtixus R. Inn. 1164. 
—D. p. 348.—Mont. p. 197. =.6.f.4. & t.14.f. 
6.—Turt. D. p.122—Inn. T. 8. p. 119 —OrtTHOocERA 
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 1s only a small round opening on the extreme 
articulation which is globose; the smaller end in some 
is rounded, in others conic and pointed. Sandwich. 
Genus —SPIRULA. 
Cylindrical, thin, semitransparent multilocular, par- 
tially twisted in a discoid spiral form, the whorls 
disunited, the last produced in a straght line ; 
chambers transverse, equally distant, concave above, 
with a lateral interrupted syphon; aperture or- 
bicular. 
S. Peroni. Lam 1.—.8.Avustrauis. F. p, 227.— 
Bl.t. 6. f. 1.—E. t. 465. f.5.—Nauvtitus Sprrua. 
Lin. 1163.—Mart. f. 184,5.—D. p. 345.—List. t. 
590. 7, 2—Gualt. t.9. f. H.~Knorr. 1. t. 2. f. 6, 
