112 THATCHERIA. 



H. TERNATANUS, Gmel. PL 44, fig. 233. 



Fawn-yellow to yellowish red; interior yellowish flesh-color. 

 Length, 3-5 inches. Indian Ocean; PhiUppines , 



A smaller, wider shell than the preceding species, with more 

 prominent tubercles. 



H. PASTINACA, Reeve. PL 44, fig. 234. 



Thin ; whitish, under a thin, yellowish epidermis. 



Length, 3-5 inches. 



Australia. 

 I do not know this species. 



H. LACTEUS, Reeve. PL 44, fig. 235. 



Yellowish cream-color, or light chestnut-yellow. 



Length, 2-5 inches. Philippines. 



I think it very probable that this and the preceding species 

 will prove to be identical. 



H. ELONGATUS, Lam. PL 44, fig. 236. 



Whitish to yellowish orange. Length, 3-4-5 inches. 



Indian Ocean. 

 H. TUBA, Gmelin. PL 44, fig. 23t. 



Yellowish flesh-color, under a brownish yellow, thin epidermis ; 

 light flesh-color within the aperture. Length, 4'5 inches. 



China; Japan. 



The broad shoulder and prominent spines or tubercles well 

 distinguish this well-known species from its congeners. 



Genus THATCHERIA, Angas. 



Shell angularly pyriform, solid ; spire prominent, shorter than 

 the aperture, many whorled, whorls flattened above, strongly 

 keeled at the periphery and contracted below ; aperture with a 

 broad incurved sinus between the extremity of the last keel and 

 the junction of the body -whorl ; basal canal wide and open ; 

 columella smooth ; outer lip simple below the sinus. 



T. MIRABILIS, Angas. PL 44, figs. 238, 239. 



Yellowish white ; aperture white. Length, 3' 5 inch. 



Japan. 



That this shell is a scalariform monstrosity cannot be doubted, 

 but what may be its normal form is not so readily ascertained, 



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