WORMS. TESTACEA. 68. Mytilus. 291 



Bilooularis, Shell blue ftriate with vaulted knobs and a white diffepi- 

 ment or partition. 



Spsngkr catal rats. tab. 6.fg. 3 — 5. 



Chemn. conch. 8. tab. Sz,fig. 736. a,b. 737* I — 3. 



Inhabits Nicobar IJlands: ovate ; the anteror part flat, the mid- 

 dle convex and gaping with an oval foramen ; the hind-part 

 convex; covered with green fkin, 



Zxastus. Shell convex, one of the margins angular • the frontal ex- 

 tremity crenate. . 



Lifter conch, tab. 365. fig, 205. 



Chemn. concb$tab. $4-. fig, 754. 



Inhabits American Ocean and Red Sea ; I J inch long : ferrugi- 

 nous whitim yellowifh or brown, fometimes blueifh : bin? 

 with 4 or 5 lateral teeth, 



Sarbatus. Shell fmoothifh, ferruginous on the outfide, and bearded at 

 the tip. 

 Ginann. adr. 2. p< 36. tab. 27. fig, 169. 

 Gua/t, ted. tab. gi*fg< H. 2 ? 

 Chemn, conch. 8. tab. $4.. fig. 749. 



Inhabits the Mediterranean and Norway Seas ; anhering to Litho- 

 phytes: \ of an inch long; under the fkin reddiih-ferruginous 

 blue or whitilh, 



f'EJulis, Shell fmoothifh violet, the valves flightly recurved on the 

 obtufe fide and fomewhat angular on the acute {ide! 

 beaks pointed. 



Pennant Brit. Zool. tab. &A..fg. 73. 



Lister conch, t. 362. f. 2C0. Barbut. t. 11.*/". 6. 



Lifter an. Aug. tab. \,jig 28, 



Bonan. recr. 2. fig. 30. Muf. Kirch. 2. f. 2C}» 



Ginann. adr, 2. p, 36. tab. 2$, fig, 168. 



. Baster op.fubf. 3. p. ,|oi . t. ll.f 9— ! I . 



Argen-uitk Zoom. /. 5./. D, E, F. 



Knorr Vergn. I. tab. 4. , fig. 5, 6 and 4. /. l$*f. !« 



Regenf. i, t.y.f, 8. /. ll.f. 58. f, 12. /*. 71, 72. 



Chemn. conch, 8. t. 84./ 750, 751, 755. 



2. /,£/?£>* Conch, tab. 362. /fjg-. 201. 



3, Lister conch, t. 3 62. /I 202, 

 _ 4. Lister conchy t. 363./". 204. 



£. Gualt. test. t. 7. A. 



Inhabits European and Indian Seas ; generally 2-3 inches long, but 

 is much larger within the tropics and fmaller more northward; 

 found in large beds, and geneaally adhering to other bodies 

 by means of the long iilky beard; the fifh affords a rich food, 

 but is often extremely noxious to many conftitutio,n3. 



O 2 " Shell 



It 



