336 Bvlletin Vanderbilt Marine Museum, Vol. VII 



form a long, wide, oval, with a long diameter of ten to eighteen 

 inches and a short diameter of seven to twelve inches. 



The head is large, flattish dorsally, somewhat rounded later- 

 ally, with large prominent eyes and with a decided triangulate 

 depression on the median ventral surface into which the dorsal 

 side of the siphon fits. The siphon extends to the base of the 

 fourth pair of arms. 



The outer buccal membrane is well developed, with the cir- 

 cumferal margin produced into usual Sepioteuthis arrangement, 

 each point bearing three to five suckers, which have dentate horny 

 rings. The beak is very powerful. 



The sessile arms are in the order 3, 4, 2, 1. The cupules are 

 in four rows. A typical large sucker taken from about midway 

 the third right arm is shown in text figure 20. The horny ring 

 of this sucker is regularly set with laciniate, triangular teeth 

 which are coarser on the upper portion of the ring, but are also 

 present in reduced form on the lower or ventral portion of this 

 ring. 



The tentacular arms are quite long and very strong, com- 

 pressed, the clubs large, occupying about .30 of the visible portion 

 of the arm, bearing a median web or keel on the dorsad, also a 

 ribbon-like web along the lateral margins. The suckers are 

 arranged in four closely crowded series, those of the two inner 

 series being larger in the median area of the club. A typical 

 example of one of these large cupules is shown in text figure 20, b. 

 The horny ring is continuously set with coarse, approximately 

 subequal triangular teeth, which are separated from each other 

 by an area approximately equal to one tooth reversed in position. 



References : Sepioteuthis mauritiana, Quoy, J. R. C, et Gaim- 

 ARD, J. P., Voy. de Decouvertes de "L' Astrolabe," 1826-1829, 

 M. J. D. D'Urville, Com., Zool., 1832, t. II, p. 76, atlas II, pi. 4, 

 figs. 2-6. — ^d'Orbigny, a. D., et Ferussac, A. S., Hist. Nat. 

 Gen. et Cephal. Acetab. vivants et Fossiles, 1835-1840 (1839) , 

 p. 300, Sepioteuthis, pi. 5, fig. 5, pi. 6, figs. 15-21. — Hoyle, 

 W. E., Rept. Voy. H.M.S. "Challenger," Zool., 1886, vol. XVI, 

 p. 27; Proc. Zool. Soc, London, 1907, p. 450. 



