164 



THE VOYAGE OF H.M.S. CHALLENGER 



3. Trophon, Montfort, 1810. 



Species. 



1. Trophon geversianus, Pallas. 



2. Trophon albolabratus, E. A. Smith. 



3. Trophon liratus, Couth. 



4. Trophon acanthodes, "Wats. 



5. Trophon carduelis, "Wats. 



6. Trophon declinans, Wats. 



7. Trophon aculeatus, "Wats. 



8. Trophon septus, "Wats. 



9. Trophon scohpax, Wats. 



1. Trophon geversianus (Pallas). 



Buccinum geversianum, Pallas, Spicil., Zool., Fasc. 10, p. 33, pi. iii. fig. 1. 



Chemnitz, Conch. Cab., vol. iv. p. 130, pi. cxxxix. fig. 1297. 

 Murex magellanicus, Gmelin, p. 3548, No. 80 (excl. var. /3). 



magellanicus and Murex peruvianus, Encyclop. method., vers., pi. ccccxix. figs. 4, 5. 

 lamellosus, Dillwyn, vol. ii. fig. 730, No. 97. 

 magellanicus, Wood, Ind. Test., p. 132, pi. xxvi. fig. 90. 



„ Lamarck, Anim. s. vert., vol. vii. p. 171, and (ed. Desh.)vol. ix. p. 589, sp. 46 (note). 



„ D'Orbigny, Ami5rique meridionale, vol. v. p. 451, No. 392. 



patagonicus, D'Orbigny, Amerique meridionale, vol. v. p. 452, pi. lxii. figs. 2, 3, No. 393. 

 varians, D'Orbigny, Ainerique meridionale, vol. v. p. 452, pi. lxii. figs. 4-7, No. 394. 

 Fusus geversianus, Eeeve, Conch. Icon., vol. iv. pi. iv. fig. 2. 

 Trophon geversianus, Sowerby, Thes. Conch., pt. 35, p. 59, sp. 1, pi. cccciv. (i. Gen.) figs. 7, 8. 



„ „ Kobelt in Conch. Cab. (ed. Kiister), pp. 275, 305, sp. 1, pi. lxxii. figs. 1-3, and 



pi. lxxiii. fig. 1, and pi. lxxv. fig. 1, and pi. Ixxvi. figs. 1, 2. 

 „ „ Tryon, Manual, voL ii. p. 144, pi. xxxii. figs. 337-347, and pi. lxx. figs. 433, 435. 



Station 151. February 7, 1874. Lat. 52° 59' 30" S., long. 73° 33' 30" E. Off 

 Heard Island, S.E. of Kerguelen. 75 fathoms. Volcanic mud. 



Station 315. January 26-28. Lat. 51° 40' S., long. 57° 50' W. Port William, Falk- 

 land Islands. 12 fathoms. 



Sand and gravel. 



Habitat. — Straits of Magellan and the Falkland Islands. 



This is a very variable species, whose limits must probably be widened. At the same time I 

 have united to it the species from Station 151 with very great hesitation. This specimen approaches 

 the variety pemvianus, Brug., but has the spire still higher and more exserted ; 

 the whorls are rounder, the whole sculpture is finer but more irregular ; the shell is 

 thinner, and is pure white outside and in. Than Trophon albolabratus, E. Sm., it 

 is thinner, the spirals are more numerous and regular, the longitudinals are far fewer, 

 the shell is broader, the whorls are of faster growth, the suture is more impressed, 

 the mouth is more oblique, the lip is thinner and more reflected, and the canal is 

 longer. 



I add here a figure of the operculum (taken from a Falkland Island specimen), 

 in order to correct the very mistaken idea of its form and mode of growth sug- 

 gested by Adams' figure (Genera, vol. iii. pi. viii. figs. 3 b, 3 c, Trophon patagonicus, 

 Brug.) It is obvious that the general form is in the main that of the genus, which is pointed with 

 the apex at the lower end, and that a faint subspiral turn comes in course of growth. This whole 



Operculum of 



T. geversianus, 



Pall. 



