93 
CATALOGUE OF CEFHALOPODA, 
fff Apex very blunt , and produced. S. tuberculata, n. 6. t. 6, 
(S. papillata, t, 3. S. mammillata, t. 4.*) 
S. Lefebrei, n. 8. t. 24. f. 1. 6. 
** Shell oblong , produced behind. 
S. inermis, n. 20. t. 6.* (S. sinensis, n. 20.) S. ornata, 
n. 19. t. 22. Microcheirus, n. 21. (inermis, t. 20.) 
*** Shell very narrow behind , and arched. 
f Apex simple. 
S. australis, n. 18. t. 12. f. 7 — 11. S. Kupellaria, n. 16. 
t. 13. f. 10. 13. S. capensis, n. 28. t. 7. f. 113. 
S. Orbigniana, n. 27. f. 5. S. australis, n. 23. t. 7. f. 4. 
ff Apex dilated. 
S. elegans, n. 26. t. 8. f. 1 — 5 . S. elongata, n. 17. t. 24. 
f. 7—10. 
The shell of S. officinalis and S. apama have the inside of the 
front part, which is next to the back of the animal, covered with a 
hoodlike horny plate, apparently formed of the continuation of the 
cartilaginous margin which has not been observed in the other 
species. 
See Longchamps (Mem. Soc. Lin . Norm. v. 1835, 79.) and 
Buckland ( Bridgewater Treat, ii. t.) on the structure of the shell. 
Synopsis of the Sections of the Genus. 
§ Sessile Arms with small equal Cups, all in four regular series. 
* Tentacular Arms with five or six series of unequal- 
sized Cups. 
** Tentacular Arms with five or six series of subequal 
moderate-sized Cups. 
3 * Tentacular Arms with twenty series of unequal-sized 
Cups. 
4 * Tentacular Arms with eight or ten series of small equal 
Cups. 
§§ Sessile Arms with small equal Cups ; the two dorsal Arms with 
only two rows, rest with two and four. 
§§§ Sessile Arms with unequal-sized large and small Cups. 
N.B . — When the animal is unknown, the species is arranged next 
to that whose shell it most resembles. 
