MOLLUSCA. 



transversely on both margins. Very large ones inhabit the seas of 

 Europe*. 



The variccs are sometimes numerous, compressed, and almost 

 membranous, constituting the Trophona, Montf. f 



At other times, they are compressed, very salient, and but few in 

 number}. 



M. de Lamarck separates from all the Murices of Brugiere, the 



RANELLA, Lam., 



Characterized by opposing varices, so that the shell is bordered 

 with them on both sides. Their canal is short, and their surface 

 studded with mere tubercles ; margins of the aperture plicated. 



The Apolles, Montf., are merely umbilicated Ranellae ||. The 



Fusus, Brug. 



Comprises all shells with a salient and straight canal, which are 

 destitute of varices. 



When the spire projects, the columella is without plicae, and the 

 margin is entire, they are the Fusus properly so called, Lam., which 

 Montfort again subdivides ; when they have no umbilicus, they are 

 his Fusus^. The shortest and most ventricose gradually approach 

 the form of the Buccina**. When provided with an umbilicus they 

 are his Latldra\\. 



The Struthiolarix are distinguished from the true Fusi by a bor- 

 der which surrounds their aperture, and which covers the columella. 

 The margin of the adult is inflated, which connects them with 

 Murexjf. 



When the spire is salient, the columella without plicee, and there is 

 a small indentation or well marked emargination of the margin near 

 the spine, they are the Pleurotoma, Lam. 



* Mur. tritonis, L., List., 959, 12; Mur. maculosus, Martini, IV, cxxxii, 1257, 

 1258; Mur. australis, Lam., Martini, IV, cxxxvi, 1284; Mur. pileare, Martini, 

 IV, cxxx, 1243, 48, 49; Mur.argus, Martini, IV, cxxxi, 1255, 1256; Mur. rubi- 

 cula, Id., cxxxii, 1259, 1267. 



f Mur. magellanicus, Martini, IV, cxxxix, 1 297. 



J Mur. tripterus, Born., X, 18, 19; Mur. obeliscus, Martini, III, cxi, 1033, 

 1037. 



N.B. They are the Mur. bufo, Montf. 574; Mur. rana, List., 995, 28; 

 Mur. reticularis, List., 935, 30 ; Mur. uffinis, and the species or varieties of Martini, 

 1229, 30, 31, 32, 33, 34, and 1269, 70, 71, 72, 73, 74, 75, 76. 



** Murex gyrinus, List., 939, 34. 



f"r Mur. cochlidium, Seb. Ill, Hi, 6; Mur. mono, List., 928, 22; Mur. c ano.lt - 

 cutatus, Martini, III, Ixvii, 742, 743; Mur. candidus, Martini, IV, cxliv, 1339; 

 Mur. ansatus, Id. Ib., 134o; Mur. lavigatus, Martini, cxli, 1319, 1320; Mur. 

 longissimus, Ib., 1344; Mur. undatus, Ib., 1433; Mur. colus, L., List., 917, 

 10; Mur. striatulus, Ib., 1351, 1352; Mur. pusio, List., 914, 7; Mur. verru- 

 cosus, Ib., 1349, 1350, &c., and the numerous fossil species described by M. de La- 

 marck. 



Mur. islandicus, Martini, IV, cxli, 1312, 1313, &c.; Mur. antiquus,!^., cxxxviii, 

 1294, and List., 962, 15; Mur. ilr-aprrtus, Martini, 1295. 



Mur, resperfilio, Id., cxlii, 1323, 24. 



HI) Mur. stramineus, Gin., Encyc. Method., 431, 1, a, b ; Strttthiofaria crcnulata, 

 Lain. 



fc Mur. bdbilonius, L., List., 917, 11; Mur. j<intnv.x, Martini, IV, 138, and 



