C. Lapworth — On British Graptoliies. 555 



From the preceding description it is evident that the fish, to which 

 this strange and beautiful snout belonged, must take its place, not 

 among the Ganoids proper, but among the Dipnoi. Of fossil fishes 

 hitherto reckoned with certainty to the last-named order, we have 

 only Cheirodus, Bipterus, Ctenodus, and Ceratodus ; the position of 

 Fhaneropleuron and Tristichopterus being still doubtful. Our fossil 

 is certainly neither Dipteriis nor Ceratodus; Cheirodus is known only 

 by its teeth ; and as to Ctenodus, the front of the head has not yet 

 been discovered, so that all evidence is wanting to connect it with 

 that genus« It seems therefore, in these circumstances, best to frame 

 a new genus for its reception ; I propose, therefore, to bestow upon 

 it the generic term Ganorhynchus (tydvo<;, pwya), coupled with the 

 specific name of Woodwardi, in honour of the distinguished 

 palaeontologist who first directed my attention to the fossil. 



EXPLANATION OF PLATE XIV. 

 Fig. 1. — Upper surface of the broken- off snout of Ganorhynchus Woodivardi. 

 Fig. 2. — Lower aspect of the same fossil, showing the ganoid and pitted labial 

 margin, the anterior nasal notches, portion of the roof of the nasal 

 chambers, and the broken-off vomer in the centre. 

 Fig. 3. — The same fossil seen from the left side. At the posterior inferior angle is 

 seen the articular surface referred to at page 553. Both of these surfaces, 

 right and left, are seen in Fig. 2, at the posterior external angles. 

 Fig. 4. — A magnified view of the smooth ganoid surface of the upper lip, showing 



the large scattered punctures or pits with which it is ornamented. 

 Fig. 5. — A microscopic section of the ganoid bone on the upper surface of the snout. 

 This drawing, executed in the absence of the author from Great Britain, 

 does not convey a very accurate or intelligible idea of the microscopic 

 structure ; the woodcut, page 554, has th«refore been substituted. 



III. — Notes on the Bbitish Gkaptolites and their Allies. 



By Chas. Lapworth, F.G.S. 



1. — On an improved Classification of the Ehabdophora.^ 



PART II. 



THE accompanying analytical Table of the genera of the 

 Bhabdophoru which are especially treated of in the present 

 paper is here offered as a first and suggestive sketch for an im- 

 proved arrangement of these forms. The foregoing conclusions have 

 been employed in its construction, and are embodied in the general 

 scheme. See Table I. 



Of the several families under Mr. Hopkinson's well-known plan 

 of arrangement, the first (Monoprionidce) comprises the whole of 

 the species distributed among the first three families in the Table. 

 The TetraprionidcB and Mono-di-prionidm, as finally interpreted 

 by himself,^ are identical with two of the new families. Thus 

 the alteration in this section is more apparent than real. It is a 

 great proof of the value of Mr. Hopkinson's original classification 

 that subsequent research has necessitated such a slight change in 

 this department. In his scheme, however, the families were each 

 founded upon a single structural peculiarity. The corresponding 

 nomenclature was so precise and inflexible that it admitted of no 

 modification or intercalation. In the proposed arrangement, on the 

 » For Part I. See Geol. Mag. Vol. X. pp. 500-504. 2 Geol. Mag. Vol. X. p. 231. 



