680 



(genus XXVI. 



MUREX: 



SHELL UNIVALVE, SPIRAL, ROUGH, WITH MEMBRA- 

 NACEOUS RIDGES ; APERTURE ENDING IN A 

 STRAIGHT, OR SLIGHTLY ASCENDING CANAL. 



Subdivmons.'\ 



* Spinous, with a produced beak. 

 ** Foliated, and the beak short. 

 *** With thick protuberant rounded varices. J 

 **#* Somewhat spinous, and without a beak. 

 ***** Unarmed, with a long straight subulate 



beak. 

 ****** Turreted and subulate, with a very short 

 beak. 



* Spinous, with a produced JBeak. 



HAUSTELLUM. 1. Shell svib-ovate, with three thick 

 varices, and intermediate smaller ribs ; beak 

 long, subulate, and straight. 



t Besides some others, which I have elsewhere mentioned, the following of 

 Gmelin's species appear to me to be undeserving of notice : 717. Jffer, p. 3358. 

 Jtf. fl^Jiis, p. 3532. M.cancfiZafus, p. 3548. ili. candWus, p. 3528. J)J. eburneus, 

 p. 3564. M. fusiformis, p. 3549. M. granulans, p. 3557. M. lignosus, p. 

 3557. M. Lima, p. 3541. VI7. JLoco, p. 3538. M. niveus, x>. 354:5. M.nodu- 

 losus, p. 3562. M. semilunaris, p. 3549. M. trigonus, p. 3549. />/. undulatus, 

 p. 3559. The following are fossils : M. campanicus, p. 3558. flJ. costatus, p. 

 3543. M.fossilis, p. 3555. M. lavigatus, p. 3555, and .17. triacanthus, p. 3527. 



J Varices are defined in Burrows's Elements of Concholocy to be ' longi- 

 tiidinal gibbons sutnres formed in the growth of the shell at certain propor- 

 tionable distances on the whirls.' See tab. 1. {.p. 



