SYNOPTIC TABLE 



OF LAMARCK'S SYSTEM. 



/No foot for crawling; no/ 



) 'Sw^^ShsU ensheathing; of on C 

 J alike and opposite, fori 

 V swimming v 



/ Body straight, never spiral / 



or with a shell capable I gj ie ]j without columella or 



of containing it ; a mus-l operculum ; not forming 



cular foot united to thc( Q com pl c te spire, unless 



bodv in its whole! rolled 



length, placed under 1 

 the belly, for crawling. \ 



\ Greater part of the body 

 twisted in a spire, sepa- . 



rate from the foot, and j Shell always BpiraI,'Who 

 always enveloped in a 

 spirivalvc shell ; foot 

 free, flat, attached to 

 the inferior base of the 

 neck, for crawling. 



generally numerous, with 

 ither a columella or an 



opeieuhiE 



Lower part of the body 



contained in a manl!e Ig hel i regularly multilocu 

 formed like abag ; head 1 ,_ a . „_ s f — :i ni ,„i» 



Cetbalofoda. i 



projecting from this 

 bag, crowned by arms, 

 not articulated, furnish- 

 ed with suckers sur- 

 rounding the mouth ; 2 

 horny jaws 



lar ; or, if unilocular, 

 whorled in the same 

 plane ; the spire entering 

 into the mouth or in- 

 clining towards it 



piece, never spiral, always exterior. 



Shell exterior, covering: in one piece in the form of a shield, c 

 sandal; or in several imbricated pieces: imperfectly or not 



ap, or) 

 at all > 



Shell partly or completely interior ; cavity simple or none ; only forming 

 a spire when the whorls completely cover each other j 



Shell exterior ; not capable of entirely containing the animal ; the spire \ ^ 

 imperfectly formed of two whorls J 



Mouth of the shell entire ; no notch or canal at the base 5. 



!A channel more or less long at the base of the shell ;) ^ ^ A 

 outer lip not changing with age J 

 A channel more or less long at the base of the shell ;\ 

 outer lip changing its form with age and having a > 7. 



sinus below j 



A short channel ascending towards the back, or an 1 ^ 

 oblique notch sub-ascending at the base of the shell, j L ' 

 No channel, a notch at the base of the mouth; folds | q 



on the columella , J 



No channel, the base of the mouth notched or effn-( ^ 

 sive ; the whorls large, rolled round the axis j 



I Shell channelled! 

 or notched, or J 

 effusive* at its \ 

 base. I 



Alat£. 

 Fenri'itircBj?. 



COLDMELL ATjE. 



[nvolutje. 



r , Shell straight or ate ost straight ;1 u 0KTnoCEHA( . Ea 



no spire J 



Shell partially spiral, last whorl } , )0 t ,„„_ 

 Miillilocular, a Septa simple at ] terminating in a straight line.. . J 

 with septa. . . | the edges, su- Shell semi-discoid, spire eccentric 13. Cutstace.e, 

 I tmes neither Shell globulous spheroidal or oval ; \ 

 1 notched or un- J whorls of the spire enveloping, vl4. 

 dulatcd on the ' or cells united within a covering) 

 internal parti- Y Shell discoid, spire central, cells i 

 lion of the tes- | radiating from the centre to the \ 15. Radiatx. 



taceous cover- 1 circumference I 



ing I Shell discoid, spire central, cells i 



in a spiral line not extending 16 NACT „. 1C Ei. 

 horn the centre to the circum-i 



ferencc / 



Septa notched at the edges, united against the inter- | 

 nal partition of the testaceous covering and arti- w 

 culated in sinuated sutures notched like parsley j 



leaves i J 



Unilocular, univalve, involute; spire entering the mouth or tending!,^ 

 towards it / 



AmMOHACEE. 



' F. Note, p. 27 . 



