76 Intelligence and Miscellaneous Articles. 



Museum, from Kimmeridge Bay, which had been previously re- 

 garded as Pliosaurian, and was recently identified with Dakosaurus 

 by Mr. Davies, Sen. From the agreement of their dimensions, and 

 their occurrence near together, the author thought it probable that 

 this skull and the lower jaw described by him last session belonged 

 to the same individual. It differs from the Steneosaurus rostro-minor 

 in the greater stoutness of its snout, in the presence of an anterior 

 pair of nasal bones prolonged into the nostril, and in the number of 

 its teeth. The author proposed to name it Steneosaurus Manseli, 

 after its discoverer. 



5. " Note on some Teeth associated with two fragments of a 

 Jaw, from Kimmeridge Bay." By J. W. Hulke, P.R.S., F.G.S. 



The author described some small teeth associated with fragments 

 of a long slender snout not unlike that of an Ichthyosaur, bat too 

 incomplete to be certainly identified. The teeth are peculiar in the 

 great development of the cementum, which gives the base of the 

 tooth the form of a small bulb. The exserted crowns are slightly 

 curved, smooth, cylindrical, and pointed. The attachment to the 

 dentary bone was probably by means of the soft tissues ; and the 

 teeth seem to have been seated in an open groove in the surface of 

 the jaw-bone. Until additional material reveal the true nature of 

 this fossil, the author proposes to place it alone, and to call it pro- 

 visionally Euthekiodon, 



X. Intelligence and Miscellaneous Articles. 



EXPERIMENTS ON THE VELOCITY OF THE PROPAGATION OP SOUND 

 IN WATER IN A CAST-IRON CONDUIT 8 DECIMETRES IN DIAME- 

 TER. BY M. PR. ANDRE. 



TTAVING been commissioned by the Ecoledes Ponts et Chaussees 

 -*--*- to superintend the supply-works of the canal from the Aisne 

 to the Marne, I had occasion to assist at the laying down of a tubular 

 conduit intended to conduct the water from the pumping-works to 

 the head of the supply reservoir. This conduit consisted of cast-iron 

 tubes of 0*8 metre internal diameter and 002 metre thick, joined 

 together by sockets and bands, and formed altogether a straight line 

 of about 600 metres. The difference of level between the two ends 

 of the conduit was 17'23 metres. 



In order to test the joints of the tubes, the conduit had to be filled 

 with water and the latter subjected to a pressure of 8 atmospheres. 

 It occurred to me that this experiment afforded a good opportunity 

 of making some fresh measurements of the velocity of the propaga- 

 tion of sound in water. The conditions under which I operated 

 were as follows. 



To record the motions of the liquid, instead of using electric re- 

 gisters, the fixing of which is always difficult and costly, I made use 

 of a pneumatic register, which physiologists, and particularly M. 



