Notices of Memoirs — Bengera Diamond Fields. 561 



specimen differs from P. spectabilis in the length of the head and of 

 the metacarpal and fore-arm bones, and from F. Meyeri, which has a 

 short head, a neck proportionally strong, with the fore-arm and 

 metacarpal of equal length. The P. Kochi possesses an orbit pro- 

 portionally small, with the bony circle composed of smooth plates ; 

 the dentition extends far back, the neck is short in proportion to the 

 body, the metacarpal and the fourth phalanx of the long finger are 

 of equal length, and the fore-arm is longer than the tibia. All these 

 characters, and some others, are found in the specimen described by 

 Dr. Winkler ; but although all the parts are smaller than the tj^pical 

 form, they are only relatively so, and hence it is considered to be a 

 young individual of the P. Kochi, Wagner. 



In alluding to the small osseous piece which is seen in this speci- 

 men at the carpal end of the bone of the right fore-arm, Dr. Winkler 

 reiterates the opinion which he had previously expressed in his de- 

 scription of P. micronyx, in the Archives, vol. iii. fasc. i., 1870, that 

 this piece is an ossified tendon, with which Prof. Quenstedt agrees, 

 and not a bone (Spannknochen) for extending the membrane, as 

 thought by some of the German palaeontologists who have studied 

 the structure of Pterodactyles. 



Another point of interest connected with this specimen is the 

 alleged discovery by Dr. Winkler of undoubted traces on the stone 

 of the membranous integument, the expansion of which was sup- 

 ported by the greatly elongated ulnar finger of the fore-limb, indica- 

 tions of which membrane had, however, been observed in a specimen 

 of P. crassipes, described by Hermann von Meyer, which also forms 

 a part of the Teyler Museum. 



Dr. Winkler further remarks that, from an examination of the 

 cast of a specimen of Bhamphorhynchus, from Eichstatt, purchased 

 for Yale College, Massachusetts, the original possessed not only 

 the membranes entire, but also the tail terminated by a kind of 

 membranous expansion. J. M. 



IV. — The Bengera Diamond Field. Bv A. Liversidge, 8vo. pp. 11. 

 (Sydney, 1873.) 

 N accoimt of the discovery of diamonds in Australia is first given, 

 and the nature of the Mudgee diamond-workings is pointed 

 out. The diamonds, occur in outliers of an old river-drift, which 

 occurs at varying distances from the river, and at heights of 40 feet 

 or so above it. These outliers are capped by beds of basalt, hard 

 and compact, and in some cases columnar ; the drift is chiefly made 

 up of boulders and pebbles of quartz, jasper, agate, flinty-slate, 

 shale, sandstone, with coarse sand and clay. The minerals associ- 

 ated with the diamond are enumerated. No diamonds have been 

 found in the river-bed except in places where the diggers have dis- 

 charged the drift into the river when washing for gold. 



The Bengera district has many points of resemblance to that at 

 Mudgee, the diamond-bearing deposits are situated in a kind of 

 basin or closed valley, and running into the valley are various spurs 

 of basalt which apparently cover portions of the drift. The relation 



DECADE II.^TOL. I. — NO. XII, 36 



