328 On the Identity 0/ CHmaxodus and Janassa. 



in height, as if they might even ultimately by long use entirely 

 disappear. 



At present only three species of Janassa are known, 

 namely, /. hituminosa, Miinster, from the Magnesian Lime- 

 stone, Climaxodus wihncatus, M'Coy, from the Mountain 

 Limestone, and C. Imgnafo rim's, Atthey, from the Coal- 

 measures. Two species have been described by Mr. T. P. 

 Barkas, under the respective names of C. ovatus^ and (7. 

 vermifo7nn{s-\. The first is merely the variety with compara- 

 tively smooth ridges ; the second is the true C. lingiia^formis, 

 whidi latter was the name first used. Mr. Barkas's two names 

 must therefore fall into the rank of synonyms J. 



Climaxodus imhricatus is somewhat intermediate between 

 the Magnesian-Limestone species and that from the Coal- 

 measures. The crown is narrower and more elongated than 

 it is in C. Itnguarformis, and the ridges are more delicate, thus 

 approximating to Janassa hituminosa. The anterior cutting- 

 margin seems to have been deep ; but the extreme border is 

 wanting in M'Coy's figure ; the root is also deficient. In the 

 description in the ' British Paleozoic Fossils ' the posterior 

 extremity is mistaken for the anterior. 



Mr. Howse will shortly publish in the ' Annals ' a full de- 

 scription of the oral armature of Janassa hitt(7ninosa in con- 

 tinuation of this paper. It therefore only remains for us to 

 state that the species will stand thus : — 



Janassa, 1832, Miinster. 



Climaxodus, 1848, M'Coy. 



J. hituminosa, 1817, Schloth., sp. 

 J. imhricata, 1848, M'Coy, sp. 

 ,/. lingucpformis, 1868, Atthey, sp. 



* Geological Magazine, vol. v. p. 495, t l^id- vol. vi. p. 381. 



\ C. vennifo7-7)iis was not described till 1869. Mr. Atthey's descrip- 

 tion of C. linf/n(fformis and that by Mr. Barkas of C. ovafm appeared 

 simultaneously on the 1st of November 18(i8 — the first in the 'Annals 

 of Natural Hi.story,' the second in the 'Geological Magazine.' Mr. 

 Atthey's paper, however, was read at the meeting of the Tyneside Natu- 

 ralists' Field Club on the previous Oth of October (>ee Nat. Hist. Trans, 

 of Northumberland and Durham, vol. iii. p. 295) ; so that the priority 

 of C. UnyrKpfoimis is clearly estaljlished. And, moreover, Mr. Atthey's 

 specimens had been in his cabinet for many years, and were seen, or 

 might have been seen, by all the palaeontologists of the district. Mr. 

 ]'>arlia?, indeed, says that he named and described C ovatus in a lec- 

 ture delivered by him, on the 28th of September, to the Mechanics' 

 Institution of Newcastle-upon-Tyne. But, were this even strictly correct, 

 we apprehend it would be no such publication of the species as to secure 

 priority. Where, however, is the record either naming or describing at 

 thi.^ time C. ovatuK ? We have searched for it in vain. 



