252 MOLLUSCA. CEPHALOPODA. Sepia. 



6. Nummulila c%fflMS.— Compressed ,smooth ; whorls about six; septa gently 



curved from the axis, numerous ; aperture rather prominent Smver. Min. 



Conch, t. Dxxxviii. f. 2 — Emsworth. 



7. N. variolaria. — Very convex, minute, smooth ; edge obtuse ; whorls 

 four or five, with about twenty septa, forming rays near the margin. {Len- 

 iicuHies variolaria of Lamarck), Sower. Min. Conch, t. Dxxxviii. f. 3. — London 

 Clay — The Nautilus Comptoni is now arranged by Mr Sowerby in the genus 

 Nummulita. 



Orthocera joararfoa'a.— Lanceolate, curved, three-angled, with a flat front, 

 and convex sides ; aperture an equilateral triangle ; siphuncle nearly centraL 

 — Sower. Min. Conch, t. cccclvii. 



SEPIADiE. 



1. Head surrounded with eight arms and two feet. 



Sepia. 

 Loligo. 



II. Head surrounded with eight arms, but destitute of feet. The 

 arms equal. 



Octopus. 



Gen. X. SEPIA.— The sac furnished with a narrow fin on each 

 side throughout its whole length. 



40. S. officinalis. Cuttle-bone. — Body smooth, arms pedun- 

 culated, lengthened ; dorsal plate elliptical. 



S. supina, Jonst. Exang. t. i. f. 3. — S. off. Linn. Syst. i. 1095. Amcm. 

 Acad. i. 609. Penn. Brit. Zool. iv. 55 — Not common. 

 Body oval, compressed, whitish, with purple dots. Anns nearly as long 

 as the body, dilated towards the extremity, and covered with suckers. The 

 dorsal plate, known in the shops under the name of Cuttlebone, was former- 

 ly used in medical practice as an absorbent. This plate is occasionally thrown 

 ashore on all parts of the coast, but the living animal is seldom found. 



Gen. XI. LOLIGO. Calamary. — Sides of the sac only fur- 

 nished partially with fins. 



* Fins united with the tail on each side. 



41. L. vulgaris. — The fins, together with the tail, forming 

 a rhomboidal expansion. 



Loligo, a Sleeve, List. Conch. Tab. Anat. ix. f s. Borl. Com. 260. t. 



XXV. f. 27 Sepia Lol. Linn. Syst. i. 1196. Penn. Brit. Zool. iv. 53. 



— Not rare. 

 Body compressed, whitish, with dark spots ; these spots in the living ani- 

 mal, and even in a portion of the skin Avhen detached, exhibit remarkable 



