Manchester Memoirs, Vol. xlviii. (1904), No. 21. 17 

 'Tentacles with hooks (Galiteuthid^) Galiteuthis. 



7°'] Tentacles (if present) with suckers only; no hooks. 



(Cranchiid^) 77 



{Body short and rounded ; fins very small, terminal. 

 Cranchia. 

 Body fusiform 78 



-Phosphorescent organs in the eyes; a row of chitinous 

 tubercles on either side of the ventral aspect of the 

 mantle 79 



78. J 



79 



No phosphorescent organs on the eyes ; no chitinous 

 tubercles on the mantle Taonius. 



Mantle membranous ; tentacles present : eyes with a 

 strongly elevated chitinous ridge, dorsal to which 

 are the phosphorescent organs ; fin subquadrangular 

 or triangular Pyrgopsis. 



Mantle gelatinous ; tentacles absent ; eyes with no 

 ridge but a row of luminous organs on the antero- 

 lateral aspect ; fin circular or transversely elliptical. 



Leachia. 

 NOTES. 



1. Lepidoteuthis, Joubin, Cephalopodes provenant des cam- 

 pagnes de la " Frimiesse-Altce" Campagnes scient. Monaco, fasc. 

 17, 1900 [1901], p. 70—78, pi. 6, 7, 10, fig. 3—6, pi. 15, fig. I, 2. 



DubioUuthis, Joubin, op. cit., p. 102 — 105, pi. 15, fig. 8 — 10. 



Cirrobrachiunt, Hoyle, Reports on the dredging operations 

 of the " Albatross," &c. Bull. Mus. Comp. ZooL, vol. 43, No. i, 

 1904, p. 28. 



2. The use of the suckers as the primary character for this 

 separation is necessitated by the fact that several genera of 

 Decapods are normally devoid of tentacles {e.g., Chaunofeuthis, 

 Leachia), and that they are not unfrequently missing owing to 

 accident. 



3. See Hoyle, "Albatross" Report, p. 7, pi. 2, fig. 2, pi. 3, 

 fig- 5- 



