74 MOLLUSCA. 



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

 Europe *. 



The varices are sometimes numerous, compressed, and almost 

 membranous, constituting the Trophoita, Montf. f 



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

 number :]:. 



M. dc Limarck separates from all the Muriccs of Brugierc, 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 tvibercles ; margins of the aperture plicated§. 



Tlie Apolles, Montf , are merely umbilicated RanelUr ||. The 



Fusus, Brt'g. 



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

 destitute of varices. 



When the spire projects, the columella is without plic-?, and the 

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

 I\Tontfort again subdivides ; when they have no umbilicus, they are 

 his Fusits'^l. The shortest and most ventricose gradually approach 

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

 are his Lat/iira\\. 



The Strutltiolaricc are distinguished from tlic 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 

 Mnrex:]:^. 



Wlien the spire is salient, the columella without plicae, and there is 

 a small indentation or well marked emargination of the margin near 

 the spine, they are the Pleurotoma, Lam.§§ 



* Mw. tritonis, L., List., 959, 12; — Mur. maculostis, ^Martini, lY, cxxxii, J257, 

 125S; — Mur. ausfralis, Lam., Martini, IV, cxxxvi, 1284; — Mur. ptteare, Martini, 

 IV, cxxx, 1243, 48, 49; — Mur.urgus, Martini, IV, cxxxi, 1255, 1256; — Mur. rubz- 

 ci'.la, Id., cxxxii, 1259, 1267. 



-f- Mur. mrigeUaiucus, Martini, IV, cxxxix, 1297. 



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

 1037. 



§ N.B. Tliey are the Mur. hufo, Montf. 574; — Mur. rana, List., 995, 28; — 

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

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



** Murex c/yrinus, List., 939, 34. 



ff Mur.cochlidivm, Seb, III,]ii, 6; — Mur. morio, List., 92S, 22; — Mur. canah- 

 cutalus, Martini, III, Ixvii, 742, 743; — Mur. candidus, Marlini, IV, cxliv, i;539; — 

 Mar. ansflftcf, Id. lb,, 134o; — Mur. loBrigatus, Martini, cxli, 1319, 1320; — Mur. 

 longissiinus, lb., 1344; — Mur. undatus, lb., 1433; — Mur. cuius, L., List., 917, 

 10; — Mur. sfriafulus, lb., 1351, 1352; — Mur. pusio. List., 914, 7; — Mur. verru- 

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

 marck. 



XX Mur. islundicus, Martini, IV, cxli, 131 2, 1313, &c.; — Mur. antiquus, lb., cxxxriii, 

 1294, and List., 962, 15; — Mur. despecfvs, Martini, 1295. 



§§ Mur, vespe?-tiUo, Id., cxlii, 1323, 24. 



nil Mur. stramincus, Gm., Encyc. Method., 431, 1, a, b; — Struthiolana crcnulata. 

 Lam. 



^1f Mur. habilonius, L., List., 917, U; — Mur. javanus. Martini, IV, 138, and 



