explanation of plate 27'. 47 
A double row of similar hooks occurs on the first 
dorsal ray of the Barbel, (Barbus Vulgaris.) And 
on the anterior ray both of the dorsal and anal fins 
of the Carp, (Cyprinus Carpio.) 
'g- 4. Transverse Section of fig. 3, at a* (De la Beche.) 
Plate 27'. V. I. p. 288. 
^'g- 1. Portion of the palatal teeth of Acrodus nobilis, 
resembling a cluster of contracted Leeches. These 
teeth are in their natural place, adhering to the 
curved granular bone of the palate, which is well 
presei-ved, and impregnated with Carbonate of lime. 
(Miss S. C. Burgon. Original.) 
^'g- 2. Continuation of the three rows of teeth on the 
reverse of fig. 1. Scale one half. (Original.) 
‘g. 3. One of the largest teeth on the centre row 
having the upper part of the Enamel worn awav 
by friction. Nat. size. (Original.) 
Fig. 4. Magnified view of the minute tubercles of Enamel 
which grew upon the skin; the decay of the skin 
Published a noti n ' 
«Pecies of fn i r f 4iscovery of the jaws of four extinct 
known in „ , ^enns Chimiera, a genus hitherto un- 
‘■‘Pproxiimf,.^ ®Pecics (C. monstrosa) 
'><■ ttie most n ° ^*^68. The Cluttnera is one 
a.s a link in the family of 
‘“Sical epochs of the o r §'■0- 
*ke duration of thi’ . Cretaceous formations, shews that 
of geoloi>-ical'e*^'^I'™''i^''”'** extended through a greater 
'**eertained bv P f “*^*^*’ ^shes yet 
t'ons in Physiolo*^” cssoi gassiz, and leads to important considera- 
*racion of one remarkable character ivith theCes- 
is connected wm *’'is species alone, among living Slmrks, 
’■'^y of the dov= /c*^ extinct forms of that family, in having the first 
®’''“'P hooks .1 ' into a strong bony spine armed with 
’ d‘e Iclitliyodornlite oi the earliest fossil Sharks, 
