THALJKSSA. IBo 



The adult specimen (P. Bronni], which I ligure from Lischke 

 (fig. 33), is remarkable for the confluence of the tubercles into 

 greatly raised rounded ribs on the body-whorl. P. clavigera, 

 Kiister (fig. 49^, is a depauperate form. Reeve's locality, " Zan- 

 zibar," for P. tn-Hinlosa is probably an error. 



P. PICA, Blainv. PI. 46, figs. 46. 47, 52. 53. 



Shell whitish, banded with dark chocolate; bands appearing 

 within the margin of outer lip and on columella; interior of 

 outer lip with close, narrow, raised, brown 'revolving lines. 



Length. 1-25-2*5 inches. 



Chin Sen ; Philippines; Central Pacific Ocean. 



Broader, more ventricose. with shorter, stouter, and more 

 direct spines than P. hippocastaneum. The want of teeth and 

 development of raised revolving ribs within the outer lip are 

 good distinguishing characters. P. euspidata, Ad. and Reeve 

 (fig. 47), is the young. 



P. ARMIGERA, Chemn. PI. 46, figs. 50, .~>i. 



White, generally with light brown bands between the rows of 

 tubercles ; aperture yellowish or pink within. 



Length, 2-3'5 inches. 



Philippines ; Paumotus, etc. 



P. affinis, Reeve (fig. 51), is the young. The animal is described 

 fully in Gould's Moll. Wilkes' Exped., p. 245. 



P. TRTSERIALIS, Blainv. PI. 47, fig. 54. 



White, with revolving bands composed of brown squares ; yel- 

 lowish white within. Length, '75-1-5 inches. 



Acapulco ; Mazatlan. 

 P. DELTOIDEA, Lam. PI. 47, figs. 55, 58. 



Light brown or whitish, with dark chestnut bands, which 

 sometimes appear also on the inside of the outer lip ; columella 

 pink. Length, '75-2 inches. 



West Indies ; Florida. 



Very closely allied to P. triserialis; the bands are not broken 

 up into squares of color, but are continuous and much darker; 

 the color of the columella is also different. 



P. albocincta, Kiister (fig. 58), appears to be founded on a 

 worn, immature specimen of this species. 



