LOLIGIDiE : SEPIOLA. 91 



with a hexagonal membrane, with a ridge running to the second, 

 third, and fourth pairs of arms ; on the first pair it passes upon 

 the web between the first pair of arms, where it bifurcates and 

 runs on each side. 



Rossia Jacobi Ball, Trans. Roy. Irish Acad. 1843 ; Thompson's 

 Report of Brit. Assoc. 1843, p. 248. ; D'Orb. Moll. Viv. et Fos. 

 i. 259. n. 5. 



Hab. Ireland, Dublin Bay. Dr. A. Jacob, 1840. 



B. Head attached to the Back of the Mantle by a broad cervical 

 Band. Fin short, in the Middle of the Sides of the Bach. 



10. SEPIOLA. 



Body short, purse-like, rounded behind, truncated before. Cervical 

 band broad. Mantle with an oblong ridge near the edge fitting 

 into a groove on the sides of the base of the siphuncle. Fins 

 on the middle of the sides of the back far apart, contracted 

 at the base. — Head short. Eyes large, prominent; inferior 

 eyelid distinct. Buccal membrane short, six- or seven-lobed. Ear 

 simple, beneath and behind the eye. Aquiferous apertures two ; 

 one brachial, between the third and fourth pairs of arms ; the 

 second lacrymal, very small, above and behind the eye. Buccal 

 apertures none. — Sessile arms conical, subulate, unequal ; cups 

 spherical, longly pediceled ; rings horny oblique, convex ex- 

 ternally ; third and fourth pairs slightly webbed at the base. 

 Tentacular arms retracted into a suborbical cavity, elongate, 

 and finned, with very many very small longly pediceled cups 

 in eight series. — Siphuncle with an internal valve, and no cen- 

 tral upper band at its junction with the head. — Shell horny, 

 sublinear, narrow at the top, wider in front, and rather dilated 

 behind, not more than half the length of the back, with a medial 

 groove and thickened edges. 



Sepiola Rondelet. Piscis et Aquat. i. 510. 1554; Aldrovand. de 



Moll. cap. 5. 1606. 

 Sepiola Leach, Zool. Misc. iii. 137. 1817, Journ. Phys. Ixxxvi. 674. 



1817; Feruss. et D'Orb. Cephal.Acet. 1839; D' Orb. Moll. Viv. et 



Fos. i. 215. 1845; Risso, Fur. Merid. 1826; Blainv. Malac. 



1825; Grant, Trans. Zool. Soc. i. 1838,- Owen, Trans. Zool. Soc. 



ii. 1838 ; Gervais et Van Beneden, Bull. Acad. Brux. v. 1838, vi. 



38. 1839. 

 Calmars sect. A. ou Sepioles Blainville. 

 Sepia sp. Linn. Gmelin, Goldfuss. 



