502 Geological Society. 



the lateral ventral plates ; the two or three posterior segments of the 

 body enlarged and tuberose ; anal styles small, not used in walking. 



1. Gonibregmatus Cumingii, Newport. 



Greyish ash-colour ; frontal segment very convex, rounded poste- 

 riorly ; mandibles blackish ; labium smooth ; all the segments of the 

 body very short, convex ; dorsal surface with numerous irregular lon- 

 gitudinal sulci ; antepenultimate segment with the dorsal and ventral 

 plates atrophied ; anal styles slender, with their basilar internal mar- 

 gin carinated; anal scale convex, subcordate, posteriorly rounded 

 with two thin marginal plates ; legs 161 pairs, naked, claws black. 

 Length 4j to 5 inches. 



From the Philippine Islands. Mr. Cuming. 



In the collection at the British Museum. 



I have never seen the Geophilus Walckenari of Gervais, but from 

 the description given of that species I strongly suspect that it ought 

 to be included in this genus. 



PROCEEDINGS OF LEARNED SOCIETIES. 



GEOLOGICAL SOCIETY. 



May 4, 1842. — Read " A Postscript to the Memoir on the occur- 

 rence of the Bristol Bone- Bed in the neighbourhood of Tewkes- 

 bury," by Hugh Edwin Strickland, Esq., F.G.S. 



Since the reading of the former communication (vol. x. p. 147), 

 Mr. Strickland has ascertained that the bone-bed occurs at least 

 ten miles further north, or at Defford Common, in Worcestershire, 

 making a total range of 104 miles. At this locality are some old 

 salt-works belonging to the Earl of Coventry, and the shaft, which 

 was sunk about seventy years ago to the depth of 175 feet, was 

 emptied a few months since of the brine with which it is wont to 

 overflow. At the bottom of the shaft, which descends through the 

 lias into the grey marl of the triassic series, but without reaching the 

 red marl, is a tunnel that follows the dip of the strata for about 

 160 yards. The shaft, Mr. Strickland says, consequently intersects 

 the horizon of "the bone-bed," and among the rubbish thrown out, 

 he found considerable quantities of the peculiar white sandstone 

 with bivalves (Posidonomya), shown in his former paper to repre- 

 sent in Worcestershire the bone-bed of Aust and Axmouth ; but he 

 also found specimens of the sandstone charged with the same 

 description of teeth, scales and coprolites so abundant at Coomb 

 Hill and the localities just mentioned. 



The occurrence of an abundance of pure salt water within the 

 area of lias, Mr. Strickland says, is an interesting phenomenon, and 

 for a solution of it, he refers to Mr. Murchison's Account of the 

 Geology of Cheltenham, p. 30. 



June 29. — " On the minute Structure of the Tusks of extinct 

 Mastodontoid Animals." By Alexander Nasmyth, Esq., F.G.S. 



The author, at the commencement of his memoir, acknowledges 

 his obligations to Dr. Grant for having first called his attention to the 



