380 MESSES. HANCOCK AND ATTHEY 



PLATE VIII. 



Fig. 1. General view of a few of the tubes, much enlarged, of Archagari- 



con bulbosum : a, peripheral envelope or cuticle of the fungus ; 



6, one of the large terminal vesicles ; c, tubular enlargement. 

 Fig. 2. A portion of a tube of the same species more highly magnified, 



with a terminal vesicle, showing the double marginal line. 

 Fig. 3. An enlarged portion of a tube, with bulbous swelling and papillose 



walls. 

 Fig. 4. The same, shoAving spore-like bodies within : a, spore-like bodies. 

 Fig. 5. Terminal extremities of three tubes without enlargements, showing 



doiible marginal line. 



XYII. — On the generic identity of Climaxodus and Janassa, two 

 Fossil Fishes related to the Rays. By Albany Hancock, F.L.S., 

 AND Thomas Atthey. (Plate IX.) 



When the paper on the teeth of Climaxodus lingucBformis was 

 published,* it was not thought desirable to hazard an opinion as 

 to their arrangement, or whether they were palatal or mandi- 

 bular, or whether or not they belonged to both the upper and 

 lower jaws. Since then we have obtained information that 

 throws much light on the subject of these curious dental organs. 



Mr. Howse having called our attention to some well preserved 

 specimens of the teeth of Janassa bituminosa of Miinsterf from 

 the Marl-Slate, it was at once obvious, as pointed out by that 

 gentleman, that they were closely related to those of Climaxo- 

 dus — so closely, indeed, that they seem to be generically the 

 same. The differences are only those of proportion, there being 

 not a single character of importance to distinguish one from the 

 other. 



The teeth in both forms are depressed and elongated in the 

 antero-posterior direction, and taper a little backwards ; in front 

 there is a wide concave margin, which, standing up like a scoop 



* Annals of Nat. Hist., Ser. 4, Vol. II., p. 321. 

 t Heitriige zur Petrcfactenkunde. Heft V.. p. 38, tab. lo, f. 10-1-i. 



