CUVIER. 523 



( Murex, Voluta, 

 D. shell turbinate, the aper- ! Strom bus, Oliva, 

 ture channelled ... Cassis, Cyprsea, 



Buccinum, Conus. 



ACEPHALES 



A. A. naked Ascidia, Biphores, 



T, i T-n 11 rOstrea, Anoniia, 



B. A. conchiterous and apoa-\ ^ i i,,, -p^^f^,, 



,, r Ti . ■ J S bpondvlus, recten. 



ous, the shell inequivalve . I -ni ^ 

 ' ^ *- rlacuna, 



C. A. conchiferous and with 



^Lima, Telliiia, 



Perna, Cardiuiu, 



Avicula, Mactra, 



afoot, the valves equaU .^J y 



nrnri Th/i lr\hoe r\T rho r^YtriYIT l.a V ^ 



and the lobes of the mantle 

 open in front .... 



Piuna, Chania, 



Anodonta, Area. 

 ^Unio, 



D. A. conchiferous and tvith\ 



a foot, the valves equal, the \ Q, i t,, -, 



r jj . ^ in 1 loolen, rnolas, 



shell gaping at both ends,)-^^ ^ T • 1 



the lobes of the mantle close 



in front ■' 



E. A. conchiferous and apod-\ 



ous, furnished ivith ^2^o [Terebratula, Orbicula. 



fleshy ciliated spiral ten- \ Lingula. 



taciila 



E. A. testaceous, furnished. 



with a number of iointed] » ^-x- i? i 



7 -T J 1 s X 1 LAnatiia, Balanus. 



and ciliated tentacula ar- [ 



ranged in pairs . . . . ) 

 There are, you perceive, three primary sections of equal 

 value, and their characteristic names are for the first time in- 

 troduced into science. In preceding systems the Cephalo- 

 pods were considered to be constituents of the order of soft 

 worms, while the Nautilus and Argonauta were members of 

 the order Testacea. The division of the Gasteropods into 

 two svibscctions from the absence or presence of a shell was 

 not a happy one ; and the vumatural result was to remove 

 the Limax far away from its near relative the Helix. The 

 claims of the Thalides and Lernasa to a place in this order 

 were subsequently proved to be unfounded. The arrange- 

 ment of the testaceous Gasteropods is borrowed partly from 

 Linneeus and partly from Adanson ; and Poli professedly 

 supplied the characters on which Cuvier distributed the Bi- 

 valves into their families. He was more original and acute 

 when he embodied with them the naked Accphales, although 

 it is probable that he mav have found the hint of their 



