416 Notices of Memoirs — Dr. Winlder, on Pterodactylus micronyx. 



in tlie report of the Eoyal Coal Commission by Mr. Prestwich, assisted 

 by Mr. John Anstie. So much, indeed the greater part, of the work- 

 able coal is hidden beneath the newer Secondary rocks, that it is a 

 subject of the highest importance as to the exact limits of the Coal- 

 bearing strata. This question is now discussed by Mr. McMurtrie, 

 who in an accompanying map shows the probable extent of the 

 Coal-measures from Tortworth to the Mendip Hills. 



After describing the Coal-measure rocks that appear at the surface 

 in this district, he discusses their range beneath the Secondary strata, 

 and refers briefly to probable coal areas in adjoining districts of the 

 South of England. In regard to the Coal south of the Mendips, he 

 considers it is not unlikely that the southern margin of this supposed 

 basin may show a transition towards the Culm-measures of Devon ; 

 but it is equally probable that its northern margin adjoining the 

 Mendips may exhibit the true productive character. 



H.B.W. 



11. — Description of a Specimen of Fterodacttlus micronyx, 

 IN THE Teylek Museum. By Dk. T. C. Winklek, etc., etc., 

 Conservator of the Teyler Museum, Harlem. 



DE. WINKLER has lately given the description of a new example 

 of Pterodactylus micronyx, found in the Lithographic Stone of 

 Eichstatt, in Bavaria, and obtained by Oberforster Frederick Spaeth, 

 at Schernfeld, in Bavaria, for the Teyler Museum. The miniature 

 fossil skeleton, which is nearly perfect, with most of the bones in 

 their proper places, lies on its left side on a slab of Lithographic 

 Stone. 



The following description is given by Dr. Winkler : Head slightly 

 bird-like. Its total length is 0-035 mill., its height O'Oll mill. 

 The frontal bone is entire, but the others are so hidden in the stone 

 that they cannot be determined. The intermaxillary bone is not 

 straight ; as in most of the Pterodactyles, there seems to be a small 

 depression towards the middle of the bone, which is 0-017 mill. long. 

 The orbit, in which may be seen the greater part of the sclerotic 

 ring (about 0-001 mill, in breadth), is nearly 0-008 mill, in diameter. 

 Dr. Winkler supposes that this bony ring has slipped from its 

 original place downwards and backwards. There is a cavity in 

 front of the orbit, from which (owing to injury) it is not entirely 

 separated. The nasal aperture is of a triangular form, the apex of 

 the triangle being directed forward. The right ramus of the lower 

 jaw is perfect. It is 0-025 centim. long, and seems to be hollow. 

 The condyle is well seen, and on the upper edge of the bone there 

 is an apophysis slightly elevated and pointed, and with a large base, 

 which Dr. Winkler calls the coronal process. The teeth are small 

 and conical ; the upper jaw contains at least eleven, the lower five 

 or six. Their length is about 0-001 mill., and they are enamelled.^ 



1 Dr. "Winkler says in his description that the teeth extend to the extremity of the 

 jaws; but his drawing seems to show a small edentulous portion in both the upper 

 and lower jaws. 



