THE NAUTILUS. 65 



normal form has maculations or bands of dark brown which often 

 become suffused and cover the entire shell, this extreme variation 

 (var. fallax n. var.) masquerading in many collections under the 

 name of maura. The usual form of tigrina is without the brown 

 bands or maculations, only the small bluish-gray spots showing. In 

 large senile specimens the spots often become obsolete or wanting on 

 the last third of the body whorl. The dark forms figured by Marrat 

 as glandiformis (fig. 174), approach closely (as in the case of ele- 

 gans) forms of funebralis Lam. The glandiformis Lam., if recog- 

 nizable, would take precedence over tigrina, but the figure referred 

 to by Lamarck in Adanson's Hist. Nat. Senegal, pi. 4, fig. 6, is not 

 identifiable. 



OLIVA BULBOSA (Bolten). 



Porphyria bulbosa Bolten, Mus. Boltenianum, p. 34, 1798. 



Oliva undata Lam., Ann. du Mus., XVI, p. 318, 1810. 



Oliva inflata Lam., /. c., XVI, p. 319, 1810. 



This variable species is always readily distinguished by having a 

 heavy callus ridge on the fascicle, independent of the columellar 

 plaits. In other respects many specimens closely resemble the more 

 inflated examples of tigrina. 



Both Bolten and Lamarck refer to the same figure by Martini 

 (Conch. Cab., II, Tab. 47, figs. 507, 508), which represents speci- 

 mens having undulating longitudinal stripes of brown. Specimens 

 with only the small uniform bluish-gray spots constitute the var. 

 injlata Lam.; when two revolving dark brown bands are present 

 the var. bicingulata Lam.; when the bands fuse and cover irregularly 

 the greater portion of the shell they represent the var. fabagina 

 Lam. The latter is figured by Marrat as " crassa " Martini. 

 Pure white examples are also frequently observed. 



OLIVA ELEGANS Lamarck. 



0. elegans Lam., Ann. du Mus., XVI, p. 312, 1810. 



0. ftava Marrat, Sowerby's Thes. Conch., IV, pi. 11, figs. 156, 

 157. 



0. infranata Marrat, L c., pi. 12, fig. 161. 



This species, though smaller, has the more cylindrical form and 

 elevated sutural callus of vidua. Light-colored examples with bright 

 salmon-colored fascicle resemble in a general way variegata Bolten. 

 It also has a similar range in color to the latter species, and lacks the 



