FUSUS. 



this variation observe F. colosseus, F. Cochlidium, and 

 Pyrula Vespertilio, and others of Lamarck. A third varia- 

 tion in form, approaching to Buccinum, consists of a 

 number of species whose spire is more lengthened than 

 the canal, which is short, and not quite straight ; the 

 greatest gibbosity of the shell in these is below the middle ; 

 F. lignarius, F. nifat, F. articulatus, &c. are characteristic 

 of this variation : the fourth variation in form consists of 

 those species which, having in general nearly the same 

 form as the first mentioned variation, namely, that of 

 Fiisus colus, and which have two or three small horizontal 

 folds at the base of the columella, immediately above the 

 contraction of the canal ;* F. infundibulum, F. craticula- 

 tus, F. polygonus, F.cariniferus, F. lineatus, are some of the 

 species belonging to this division. It is worthy of remark 

 respecting the five last mentioned shells that Lamarck had 

 formerly placed the three first among the Fiisi, and the 

 two latter among the Fasciolariae, though at length he 

 placed all five among the Turbinelli. Other variations in 

 form there are, which we rather hesitate to unite with 

 Fusus, partly because we are but slightly acquainted with 

 them, and partly because they are so peculiar, that we 

 fear we might be charged with forming an incongruous 

 association by so doing, inasmuch as we should be scarcely 

 able to convince naturalists of its propriety. These are, 

 first, the Turbinella rustica of Lamarck, which is a thick, 

 solid, oval shell, with a gradually tapering short spire, 

 and a short canal, in its general shape it is much like 

 Fusus Bulbulus of Lamarck, a very common Fossil in the 

 London Clay, and the Calcaire grossier, but difi^ers from 

 that species in having three small horizontal folds at the 

 base of the columella : secondly, two other shells nanied 

 by Lamarck, Turbinella leucozonalis and T. cingulifera : 

 we believe these two to be really only varieties of one 

 species, which is very peculiar, and forms a sort of link 

 connecting the Fusi with Lamarck's Monoceros cingula- 



* Under the article Fasciolaria in this work we have suggested that it 

 might not be improper to separate these as a distinct Genus ; we are not however 

 satisfied of the necessity of adopting this proposition ; and we place them with 

 Fusus as being incontrovertibly more nearly related to that Genus than to 

 Fasciolaria or Turbinella, to both of which some of them have been united. 



