410 APPENDIX. No. IV. 



dorsal fin, with the first ray thick striated without teeth, caudal fin witli 



lanceolate laciniae. 



Obs. The front of the head is obtuse and rounded ; the upper part is 

 irregularly sulcated, and the vertex is striated : the stria; being disposed 

 in rays; the mouth is large; the filaments of the nostrils are very 

 short, and those of the angles of the mouth are a third longer than 

 those of the chin. The hinder dorsal fin is short and not very 

 fleshy. 

 Sp. 3. Onyrhynchus deliciosus. The scales concentrically sculptured, the dorsal 



ones rounded ; those of the sides and belly very broad, the teeth hnear 



acuminated behind and before. 



Obs. This animal is doubtless referable to the genus Oxyrhynclius of 

 Athenaeus.* It differs from its congener Momyrus anguilloidcs (Geoff. 

 Poiss. de Nil. pi. vii.) in the form of its scales, (wliich in that species 

 are of tlie same size and form on all parts of the body) and in the shape 

 of the dorsal fin, which in O. deliciosus is more acute in its hinder 

 upper edge. This fish is very common in the river, and its flesh is of 

 a most exquisite flavour. 



CEPHALOPODA.-f- 



Of this class one new genus, and six new species were discovered ; four of 

 wliich are figured in the annexed plate. 



Genus I. Octthoe. Sp. 1. Ocythoe Cranchii, of which a description is given 

 in Appendix, No. III. 



Genus II. Cranchia.+ Body oval, sack-shaped: fins approximating, their 

 extremities free : neck with a frenum behind, connecting it with the sack, and 

 with two other frena connecting it with the sack before. 

 sp. I . Cranclda scdbra. Sack rough, with hard rough tubercles. 

 Sp. 2. Cranchia maculata. Sack smooth, beautifully mottled with distant ovate 

 spots. 



• Drfpnos, lib. iii. 116; viii. 356; vii. 312. 



+ For a synopsis of the genera of this class see Zoological Miscellany, vol. iii. 



t The localities of the two species sent home were unfortunately lost. 



