570 Reviews — Dr. G. Holm — On Caryocrinus. 



an early opportunity of expressing bis views on the subject. The 

 point to which we allude is that, according to Dr. Fritsch's definition 

 of this group of Labyrinthodonts, the whole of the body was invested 

 with scutes, whereas our author only mentions a ventral armour. 



Of still more interest is the genus Petrohates, another small form 

 presenting such a marked general resemblance to Ifylonomus that 

 its remains have hitherto been confused with those of that genus. 

 It differs, however, among other characters, by the smaller skull 

 (which does not appear to have been of a Labyrinthodont type), the 

 longer tail, and the replacement of the Labyrinthodont ventral 

 buckler by a system of abdominal ribs like those of the existing 

 Rhynchocephalian genus Sphenodon. Its Labyrinthodont affinities 

 are, however, displayed by the attachment of the pelvis to the 

 vertebral column by means of only a single sacral vertebra. Since, 

 however, this feature is exhibited by the genus Pariasaurvs, which 

 appears to be a reptile, although exhibiting marked Amphibian 

 affinities, it affords no argument why Petrohates should not likewise 

 be included in the Reptilia. 



Dr. Credner considers that Petrohates connects Hylonomus with 

 those Rhynchocephalian reptiles from the same deposits which he 

 has described in earlier fasciculi of the same memoir under the 

 name of Cadaliosaurus and Palceohatteria ; and the result of his 

 latest researches seems to establish, beyond the possibility of doubt, 

 the intimate affinities existing between certain groups of the 

 Labyrinthodonts and the earliest Rhynchocephalians. 



The memoir concludes with the description of the skeleton of a 

 small rhachitomous Labyrinthodont named Discosaurus. We would, 

 however, point out to Dr. Credner that this name had been employed 

 at an eailier date by Prof. Leidy for a Sauropterygian, and we would 

 therefore suggest that he should take an early opportunity of pro- 

 posing a new term. 



We shall look forward with interest to further contributions b}' the 

 author on the subject on which he has already thrown so much new 

 liiiht. R. L. 



IV. — Holm, Gerhard. Om forekomsten af en Caryocrinus i 

 Sverige. Sver. Gi-eol. Undersokn. Ser. C. No. 115, pp. 14, 15. 

 (Stockholm, 1890.) 



|F the interesting genus Caryocrinus but a single species has been 

 described, and this species, G. ornatus, Say, has only been 

 found in N. America. There it occurs in the Niagara and also, 

 according to S. A. Miller, in the Clinton group. These groups are 

 regarded as synchronous with the British Silurian from the Wenlock 

 Limestone to possibly as low as the Tarannon Shales. 



In the present paper Dr. Holm records the find of a new species 

 of Caryocrinus in the lower layers of the Leptama-kalk on the west 

 side of the Lissberg near Gullerasen in Boda, a district of Dalecarlia. 

 The Lepteena-kalk has not been traced beyond Dalecarlia, but on 

 palasontological grounds it is referred to the Upper Ordovician. In 

 the present instance among the associated fossils are Cyclonema 



