44 
EXPLANATION OF PLATES 27*. 27^ 
Plate 27*. V. I. p, 274. 
Fig. 1. Lepidosteus osseus, or bony Pike of North Ame- 
rica. (Agassiz. Vol. 2. Tab. A.) 
Fig. 2. Portion of the lower Jaw of Lepidosteus osseus, 
shewing the occurrence of a row of larger conical 
hollow teeth, fluted externally, between two rows of 
smaller Teeth. (Original.) 
2. a. Longitudinal section of a large Tooth, shewing the 
internal hollow cone. (Original.) 
2. b. Transverse section of a large Tooth. (Original.) 
Fig. 3. Transverse section of the Jaw. fig. 2. (Original.) 
Fig. 4. Fragment of a small upper Jaw of Megalichthys 
Hibberti, from Burdie house, shewing a disposition 
of large and small teeth, similar to that in fig. 2. 
(Hibhert.) 
4. a. b. Transverse section of the larger teeth. _ 
4. c. Longitudinal section of a large Tooth.* ( 
4. d. Punctate scale of Megalichthys. 
Fig. 5. Aspidohrynchus : a fossil Sauroid fish from the 
Lime stone of Solenhofen. (Agassiz, Vol. I. Tab. F.) 
Plate 21\ V. I. p. 278. 
Amblypterus : one of the fossil fishes peculiar to the 
Carboniferous strata. (Agassiz, Vol. I. Tab. A. fig. 3.) 
* It appears that in the Megalichthys and Holoptychus the struc- 
ture of the teeth, both large and small, was precisely the same as in 
the large and small teeth of Lepidosteus osseus, both as to the hollow 
internal conical cavity, and the external llutings towards the base, and 
also as to their mode of growth by ascent of fibrous matter from the 
bony substance of the jaw, and not from roots placed in deep alveoli, 
as in many of the Saurians. 
