46 LIXNEAN GENEBA. 



D Spire, I front, n n n the outer lip, o pillar -lip, Q canal or gutfer. 



Tiie young shells of this genus want the dilated lip, which is one of the 

 most essential characters of the strombi, and are iu consequence ofieu con- 

 founded with the genera Buecinum and Miu-ex. 



Genus 26.— MURE X. 



Animal a Limax ; shell univalve, spiral, rough, with mem- 

 braneous sutures ; aperture oval, ending in an entire straight oi 

 slightly ascending canal, 



Linne divides the Murices into six families : *spinous, with a produced 

 beak ; **sutures expanding into crisped foliations ; beak abbreviated ; 

 ***ventricose, with thick protuberant rounded sutures ; ****more or lesa 

 spinous, and without manifest beak ; ***r«with a long, straight, subulate, 

 closed beak, and unarmed with spines j ******tapering, subulate, »\ itii a 

 very short beak. 



Murex antiquus. — The Antiquated IMurex, Plate VIII. 

 fig. 26. (Fusus antiquus, Lamarck.) Oblong, transversely striat- 

 ed ; beak elongated ; spire with seven or eight cylindrical volu- 

 tions : yellowish white, saffron-yellow, with margin of outer lip 

 acute, and entire. From six to eight inches long. — Inhabits the 

 British coasts. 



Murex muricatus. — The Muricated Murex. Plate II. 

 fig. 11. Shell strong and rough, with from six to seven ventri- 

 cose, tuberculated volutions, tapering to a fine point ; the tuber- 

 cles are formed by interrupted, longitudinal ribs, crossed by 

 strong elevated stria, and in some parts are pointed or angulated ; 

 apex smooth ; aperture oval, terminating in a long slender 

 canal; outer lip sharp and dentated at the edge, margin within 

 crenulated; pillar-lip smooth. Inhabits the British seas, ra- 

 ther a local shell. 



B Base, c aperture, k k &c. sides, p the beak or rostrum, q canal or gut- 

 ter. 



The Muricrs are only found in the ocean. They in general frequent rocky 

 b lores and some of them burrow in the sand. 



Genus 27— TROCHUS. 



Animal a Limax ; shell univalve, spiral, more or less conic ; 

 aperture somewhat angular or rounded, the upper side trans- 

 verse and contracted ; pillar placed obliquely. 



Linne divides the Trochi into three families : *umbilicated, erect, with pil. 

 lar perforated ; **imperforate, erect, with the umbilicus closed ; *«*taper- 



