238 TESTACEOUS MOLLITSCA. 



Section C. 



Lithodomi. Elongated subcylindrical, dorsal and ventral edges sub- 

 parallel; beaks terminal or subterminal : no elevated dorsal angle. 

 M. Pulex. Lam. 6. Very small, oblong subtrapeziform, sub- 

 cylindrical nearly smooth, depressed at the broader end, brownish 

 or violet ash colour f . — New Holland. " Not so arcuated as List, 

 t. 359. f. 197." 



M. Cinnamonea. Lam. 18. Mytilus C. Ch. f. 731. — E. t. 

 221. f. 4. Subcylindrical, ventricose, curved, retuse at each end : 

 beaks slightly prominent; cuticle yellowish chesnut. Mauritius, ii. 

 M. Silicula. Lam. 19. Oblong, subcylindrical. straight, with 

 merely the lines of growth, both extremities obtuse the anterior re- 

 tuse ; white with the cuticle very dark chesnut. New Holland. 

 "Probably a less curved variety of thelast." (Desh) The original 

 specimen in the museum is certainly very like Cinnamoneus and Fuscus. 

 M. Semen. Lam. 21. — Mytilus Coralliophagus. Ch.f.752. 

 D. p. 305. — E. t. 219./.4. Angulated oblong, obtuse posteriorly and 

 attenuated at the anterior extremity, with delicate longitudinal striae, 

 the margin partly denticulated. § . — East Indies 1 



M. Lithophaga. Lam. — Mytilus L. Lin. Sys 1156. — D. p. 

 303. Elongated, cylindraceous, straight, more tumid towards the 

 beaks, extremities obtuse, with strong longitudinal striae on one 

 portion of the shell decussating the lines of growth. Far. A. Ch. 

 f. 730.— List. 427. /. 268.— E. t. 221. /. 6, 7.— Modiola. L. 

 Phil. p. 71. — Lithodomus Dactylus. Sow. G.f. 1. — Reeve Sys. t. 

 99./. 1. — Cuticle chesnut, the longitudinal striae direct and slightly 

 undulated. Mediterranean. — Far. B. Myt. Lithophagus. Lin. mus. 

 Ulrie.539.—Ch.f. 729.— E. t. 221,/. 5. Narrower, the cuticle 

 black. 3. — Mediterranean and W. Indies. — The variety (if indeed not 

 a distinct species.} E. Indies. 



M. Cavdigera. Lam. 23. — E. t.221.f 8. — Le Ropan. Adans. 

 Sen. t. 19. /. 2.— Mytilus Aristatus/). p. 203.— W. t. 12. /. 8. 

 Lithodomus C. Sow. G.f 4. — Reeve Sys. t. 99. f. 4.< — L. Striatus. 

 Lin. Tr. 8. /. 6. f. 3, 4, 5. Elongated, straight, smooth, very thin, 

 subcylindrical, nacreous under the fulvous yellow epidermis, which 

 is usually covered with a whitish calcareous coating strongest at 

 the anterior extremity and produced beyond the shell in two narrow 

 beak-like appendages which cross each other ; beaks obsolete ; 

 ventral edge nearly straight ; dorsal very slightly elevated as far 

 as the termination of the ligament, and sloping obliquely thence to 

 the obtuse anterior extremity. 2\. — Senegal. 



M. Attenuata. Desh. in Lam. vol. 7. p. 28. — Lithodomus 

 Cavdigerus Var. Sow. G. f 3. — Reeve, t. 99. f. 3 — Elongated 

 and narrow, subcylindrical, obtuse at the beaks, at the other extremi- 

 ty attenuated and terminated by calcareous appendages which do 



