J 
6 GENUS HARPA. 
The male shells are known by three essential distinctions; 
their shell is thicker, smaller, and more slender. 
The Harps are found in abundance in the regions of the 
Isle of Sunda, of New Holland, the Isle of France, and in 
the Red Sea. 
1. ZARPA VENTRICOSA, Lam. The Ventricose Harp. 
(Collect. Mass. Lam.) Bonannt, Recr. 3, fig. 185. 
Pl. I, fig. 1 and 1 @ young; pl. II, fig. 2, variety with compact ribs. 
Pl. III, fig. 4, var. Conoidalis ; pl. IV, fig. 7, young, striated. 
H. testa ovato-ventricosi; costis latis, compressis, purpureo tinctis, 
apice mucronatis, infra mucronem subunidentatis; interstitiis albidis, 
maculis arcuatis spadiceo-fuscis notatis; columella purpureo et nigro 
maculata. 
Shell oval, ventricose, pretty large, polished, ornamented 
with more or less distant, wide, compressed, smooth, parallel 
ribs, inclined towards the base, of a pale rose color, most com- 
monly with quadrangular deep brown spots. ‘These ribs are 
pointed at their summit, and a little below these form a slight 
keel, caused by small asperities. ‘The interstice between the 
ribs is slightly striated longitudinally ; it is whitish or violet, 
adorned with brown or reddish spots, forming regular festoons 
throughout its whole length; there are found also upon the 
surface of the shell two or three bands, sometimes replaced by 
large spots, which alike surround it. The middle band is 
always most apparent. ‘The spire is short, composed of six 
whirls slightly flattened above; aperture large, reddish, ter- 
minated at base by an oblique, shallow emargination, marked 
within with brown spots or bands ; right lip bordered exter- 
nally by the last rib; columella smooth, brilliant, almost 
covered with very dark brown spots. 
Length 4 inches. Width 3 inches. 
Inhabits the Indian Seas, at New Guinea and Port Dorey ; 
the Isles of France and Bourbon. 
