litbliof/rajihical Xotic^. 71 



sleiulcr squanue, basal spjjmont ratlirr lonpror than st'cond, 

 the iiitfiveiiiiijif suture an<^ulale iiu'dially ; third and fourth 

 ccjual, uitli strai;;ht sutures ; fourth and (ilth trau.svei*stly 

 dcprfj^sed nu'dially at the base. 



When plared side by side with S. carinatvs the diiFerencc 

 in eoh)ration is very apparent, that speeies appearing to Ix; 

 entirely of a peculiar sli<^htly rufesccnt grey, the derm itself 

 being invisible; whereas S. /lui/soni a|)pears to be nearly 

 blaek, the .s(|uani()sity iieing ineonspieuous. In the former 

 species the rostral carina is less distinct, the front of the 

 thorax is not emargiuate, the scutcUum is well developed, 

 the elytral striaj are finely punctured throughout, and the 

 third interstices are quite as nodiform behind as the fifth. 



Length (rost. inel.) 8; breadth 8 lines. 



Mount Holdsworth, at an elevation of 1300 feet. 



Named in honour of Mr. Ci. \ . Hudson, who discovered it. 



[To be continued.] 



LIBLIOCiUArniCAL NOTICE. 



Iowa Gtolotjical Survc'/. Vol. xviii. Annual Report 1907. Dcs 

 Moiiic8 : I'ultlished lor Iowa Geological Survey, 19u8. I'p. i-xi, 

 1-L'91 ; pis. i.-xvi. 



Thk bulk of this Report is devoted to a most valuable dissertation 

 on the Devonian Fishes of Iowa by Charles K. Eastman. Of great 

 length and thoroughly exhaustive of the subject, it would be im- 

 possible here to give an adequate summary of its contents. In 

 the introductory portion of his memoir the Author surveys that 

 thorny prublem the origin of the paired fins, wherein he favours 

 the arguments of Dean and Cope as against Smith Woodward ; 

 and later he discusses the clat;sirication of the Artlirodira, reviewing 

 the work of Continental savants, and, among Uritish iciithyologist.s, 

 Mr. C. T. Regan, Trof. Bridge, Dr. Traquair, and Mr. [ajVJ E. Ray 

 Liinkester. 



There is much that is new in these pages, as might be supposed, 

 and not a little that will aHord matter for further debate. I'erhajo 

 one of the most remarkable things in the wholo Report is the 

 Author's asserted discovery of an actual fossil brain, in IVtadiiuchtJiiis 

 iliani, sp. n. Tlie substance of this brain, he tells us, " beeamo 

 transfornud into calcium phosphate before decomposition sit in. and 

 whose walls in consequence are scarcely shrunken. This view is 



