400 
Claflifica- 
tion of 
Shells. 
CON C H 
11. SfoNDYLUS. Animal tethys. Telia inaequi- 
valvis rigida. Cardo dentibus duobus recurvis, cum 
foveola intermedia. 
12. Chama. Animal tethys. Telia bivalvis craf- 
fior, cardo callo gibbo, oblique inferto foffulae obliquce. 
13. Arca. Animal tethys ? Telia bivalvis aequi- 
valvis. Cardo dentibus numerofis, acutis alternis in- 
fertis. 
14. OsTREA. Animal tethys. Telia bivalvis, plu- 
rimis inaequivalvis fubaurita. Cardo edentulus, foffu- 
la cava, ovata, fulcifque (in plurimis) lateralibus tranf- 
verfis. 
15. Anomia. Animal corpus ligula emarginata ci- 
liata : ciliis valvae fuperiori affixis : brachiis duobus 
linearibus corpore longioribus conniventibus porredflis, 
.valvae alternis utrinque ciliatis : ciliis affixis valvae utri- 
que : tella inaequivalvis, valva altera planiufcula, al- 
tera bafi magis gibba : parum altera bafi faepe perfora- 
ta. Cardo cicatricula lineari prominente introrfum 
dente laterali ; valvae vero planioris in ipfo margine. 
Badii duo offei pro bafi animalis. 
16. Mytilus. Animal afcidia ? Telia bivalvis, 
rudis, fepius affixa byflb, ut plurimum, craffiori. Car- 
do in plurimis edentulus, diftin£lus, paucis exceptis, 
linea fubulata, excavata longitudinali. 
17. Pinna. Animal limax. Telia fub-bivalvis fra- 
gilis, eredta hians, emittens barbam byffinam. Cardo 
edentulus, coalitis in unam valvis. 
Shells. 
o L O G Y. Ck.p. IV. 
ij. S. Animal a tethys. Shell hard, folid, with Claffifica- 
unequal valves. Hinge with two recurved teeth, fepa- tionof 
rated by a fmall cavity. 
12. C. Animal a tethys. Shell bivalve, rather 
coarfe. Hinge with a callous protuberance, obliquely 
inferted in an oblique hollow. 
13. A. Animal a tethys ? Shell bivalve equivalve. 
Hinge with numerous lharp teeth, alternately inferted 
between each other. 
14. O. Animal a tethys. Shell bivalve, generally 
with unequal valves, and {lightly eared. Hinge with- 
out teeth, but furnilhed with an ovate cavity, and in 
molt with lateral, tranfverfe furrows. 
15. A. Animal an emarginate, ciliated, ftrap-lhap- 
ed body, with bridles attached to the upper valve j 
arms two, linear, longer than the body, projecting 
and approaching together, alternate on the valve, and 
ciliated on each fide, with briitles affixed to each valve. 
Shell inequivalve, one of the valves flattilh, the other, 
protuberant at the bafe : one of the valves often per- 
forated near the bafe. Hinge with a linear prominent 
cicatrix, and a lateral tooth placed within but on the 
very margin of the flat valve there are tw r o bony rays 
for the bafe of the animal. 
16. M. Animal an afcidia ? Shell bivalve, rough, 
generally affixed by a byflus or beard of filky filaments. 
Hinge moftly without teeth, and in molt cafes with a 
fubulate, hollow, longitudinal line. 
17. P. Animal a limax. Shell bivalve, brittle, 
gaping at one end, and having a byflus or beard. 
Hinge without teeth, the valves being united into one. 
III. UNIVALVE SHELLS. 
Univalves. 18. Argonauta. Animal fepia aut clio. Tefla 
univalvis, fpiralis, involuta, membranacea, unilocularis. 
19. Nautilus. Animal ? Tefla univalvis, ifthmis 
perforatis concamerata, polythalamia. 
20. Conus. Animal limax. . Tefla univalvis con- 
voluta, turbinata ; apertura effufa, longitudinalis, line- 
aris, edentula, bafi integra 5 columella levis. 
21. Cyprjea. Animal limax. Tefla univalvis, 
involuta, fub-ovata, obtufa, laevis. Apertura utrinque 
effufa, linearis utrinque dentata longitudinalis. 
22. Bulla. Animal limax. Tefla univalvis eon- 
voluta, inermis. Apertura fub-coardata, oblonga, lon- 
gitudinalis, bafi integerrima. Columella obliqua, lae- 
vis. 
23. Voluta. Animal limax. Tefla unilocularis 
fpiralis. Apertura ecaudata, fub-effufa. Columella 
plicata : labio umbilicove (ut plurimum) nullo. 
24. Buccinum. Animal limax. Tefla univalvis, 
{piralis, gibbofa. Apertura ovata definens in canali- 
cjulum (retufam lacunam) dextrum, cauda retufa. La- 
bium interius explanatum. 
25. Strombus. Animal limax. Tefla univalvis, 
fpiralis, latere ampliata. Apertura labro faepius dila- 
tato, definens in canalem finiftrum. 
26. Murex. Animal limax. Tefla univalvis, fpi- 
rahs, exafperata futuris membranaceis, Apertura defi- 
18. A. Animal a fepia or clio. Shell univalve, 
fpiral, involute, membranaceous, one cell. 
19. N. Animal ? Shell univalve, divided into feve- 
ral chambers communicating with each other. 
20. C. Animal a limax. Shell univalve, convolute, 
turbinate j aperture effufe, longitudinal, linear, with- 
out teeth ) entire at the bafe. Pillar fmooth. 
21. C. Animal a flug. Shell univalve, involute, 
fubovate, fmooth, obtufe. Aperture effufe at each end, 
linear, extending the whole length of the Ihell, and 
toothed on each fide. 
22. B. Animal a limax. Shell univalve, convolute, 
without teeth. Aperture a little narrowed, oblong, lon- 
gitudinal, quite entire at the bafe. Pillar oblique and 
fmooth. 
23. V. Animal a limax. Shell one cell, fpiral. 
Aperture without a beak, and fomewhat effufe. Pillar 
twilled or plaited : generally w ithout lips or perfora- 
tion. 
24. B. Animal a limax. Shell univalve, fpiral, gib- 
bous. Aperture ovate, ending in a Ihort canal, lean- 
ing to the right, with a retufe beak. Internal or pil- 
lar lip expanded. 
25. S. Animal a limax. Shell univalve, fpiral, en- 
larged at the fide. Aperture dilated with the lip ex- 
panding, and ending in a groove towards the left. 
26. M. Animal a limax. Shell univalve, fpiral, 
rough, with membranaceous futures. Aperture oval, 
terminating 
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