222 TEUTHIDiE. 



R. MACROsoMA, Delle Cliiaje. 



Suckers ou the arms small, numerous, nearly equal. 



Plate MMM, fig. 1. 



Sepiola mucrosomu, Delle Chiaje, Mem. t. Ixx. Anbn. twfcr^, vol. i. pi. 11, 

 f. 11. — Philippi, Enum. Moll. Sic. vol. i, p. 203.— 

 GERVAisand Van Beneden, Bull, de I'Acad. de Brux. 

 vol. vi. No. 1. 



Rossia „ D'Orbigny and Ferussac, Ceph. Acet. p. 245. Sepiola, 



pi. 4. f. 13— 24.— D'Orbiuny, Moll. Viv. et Foss. vol. i. 



p. 257. pi. 11.— Veranv. Moll. Med. vol i. p. CO. pi. 23, 



fig. a. h. 



„ Jucolii, Ball, Proc. Royal Irish Acad. vol. ii. p. 193. — Thompson, Rep. 



Brit. Assoc. 1843, p. 248. 



This cuttle-fish was first met with on our coasts by Dr. 

 Jacob, of Dublin, who obtained it from Dublin Bay, and 

 communicated in to Dr. Ball. 



Its body is large, smooth, and broadly bell-shaped, 

 with latero-dorsal suborbicular fins, having broad bases of 

 attachment. The head is broad and short ; with i)ronii- 

 nent eyes. The arms are rather short in proportion, linear- 

 lanceolate. They are strongly webbed together at their 

 bases, with the exception of the lower pair. Dr. Ball 

 remarks that " the membrane round the mouth forms an 

 hexagonal figure, from each angle of which a ridge runs, 

 which is decurrent in six cases ; on the second, third, and 

 fourth pair of arms, and in the seventh, the ridge passes 

 upon the web between the first pair of arms, where it 

 bifurcates and runs out on the side." The suckers are 

 small, oblique, white, and pedunculate ; they are ranked 

 in double file on the lower part of the under surfaces of 

 the arms, and in fours regularly and irregularly through- 

 out the remainder. The suckers are nearly e((ual in size 

 on all the arms. The tentacles are very long and slender 



