Class VI. MUREX. ROCK-SHELL. 



279 



GENUS XXV. MUREX. ROCK-SHELL. 



Animal, a Slug. 



Shell spiral, often rough with knobs. 

 Aperture oval; the beak narrows into a strait 

 canal or gutter, a little ascending. 



* Sutures rough, with curled scales, tail short. 



Lin. Syst. 1206. No. 526. 



Gm. Lin. 3530. 

 Gualtigri tab. 49. Jig. H. 



Lin. Tr. viii. 142. 

 Mont. Test. Br. 2bQ. 



M. with an angular shell, surrounded with tu- 

 bular ribs ; each rib ending with its mouth on 

 the angle. Consists of six spires on the whole; 

 a most rugged shell. The aperture exactly 

 oval -, the gutter or canal covered. Length near 

 two inches. Tab. lxxix. Jig. I. 



** With a strait elongated tail ; gutter 

 covered. 



1. ERINA« 



CEUS. 



urchin. 



Lin. Tr. viii. 147- 



Mont. Test. Br. 257. 



M. with five or six spires, the body ventricose : 

 the spires rising into angulated ridges. The 

 aperture semicircular. Length near four inches. 



2. CARINA- 

 TITS. 



angulated. 



