(5 GENUS H ARPA. 



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 . HARP A VENTRICOS A, LAM. The Ventricose Harp. 



(Collect. MASS. LAM.) BONANNI, Recr. 3, fig. 185. 







PI. I, fig. 1 and 1 a young; pi. II, fig. 2, variety with compact ribs. 

 PI. Ill, fig. 4, var. Conoidalis ; pi. IV, fig. 7, young, striated. 



H. testa ovato-ventricosa ; 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. 



