218 SYSTEMATIC ARRANGEMENT 



sheath. Gills ramose, plumose, in a single series along a ridge 

 edging the back. Lingual membrane broad, with numerous series 

 of simple or denticulated spines, a tricuspid central series, and a 

 broad plate on each side of it. Jaws very large, horny. 



* Frontal tent acuta tufted. 



1 . T. Hombergii, t. 2 1 1 . f. 2, t. 2 1 2. f. 3, 5, 9 ; Forbes $• Hanley, 



B.M. t.A.A.A. f. 3. 



2. T. acuminata, t. 212. f. 8. 



3. T. quadrilateralis, t. 212. f. 7. 



4. T. decaphylla, t. 198. f. 11. 



5. T. Costse, t. 209. f. 3. 



6. T. rubra, t. 212. f. 3. 



7. T. glamse, t. 211. f. 4, t. 227. f. 1, 2. 



8. T. cvanobranchiata, t. 211. f. 3. 



9. T. fhethydea, t. 211. f. 1. 



** Frontal tentacula simple. Oandiella. 



10. T. plebeia, t. 209. f. 2, t. 212. f. 4. 



11. T. lineata, Alder, Monog. v. t. 4. 



12. T. (Duvaucelia) gracilis, Risso, Eur op. Merid. 



Fam. X. SCYLLiEIDiE. 



Body compressed. Cloak produced into lateral lobes bearing the 

 branchial plumes. Anus lateral. Mouth with jaws. Liver central. 



1. ScYLE^EA. 



Body elongate, compressed. Foot linear. Back convex, with 

 two large wing-lobes bearing small gills scattered on their inner 

 surface ; forehead with a slight veil. Tentacles : two dorsal with 

 lamellated clubs, retractile ; sheaths large. Lingual membrane 

 broad, with a central and numerous series of spinose teeth, all den- 

 ticulated. Teeth 24 • 1 • 24. Jaws large, horny. Gizzard armed. 

 Oceanic ; living attached by its narrow foot to floating seaweed. 



1. S. pelagica, t. 203. f. I, 3 ; Forbes $• Hartley, B.M. t. A.A.A. 



f. 5. 



2. S. Ghomfodensis, t. 203. f. 4. 



3. S. Quoyii, t. 203. f. 5. 



4. S. Hookeri, t. 203. f. 6. 



" Central tooth of ScylUea pelayica compressed, elongated above, 

 cutting edge one-pointed, on each side four to five crested small 

 teeth ; Lateral teeth on each side 24, in front moderately produced, 

 slightly curved, claw-like, on each side denticulated, base produced 

 into an obtuse process." Loven. 



