Mr. H. J. Carter on the Spongiadce and the Foraminifera. 351 



XXXIX. — Description of a new Saurian (Hjalosaurus) 

 allied to Pseudopus. By Dr. Albert Gunther. 



A FEW clays ago, when looking with Professor Kolliker at 

 some animals in Mr. Jamracli's establishment, two living 

 reptiles (a Zamenis hippocrepis and what appeared to be a 

 young Pseudopus) were offered for sale by a man who stated 

 that he had just obtained them from a ship coming from North 

 Africa. 



On a closer inspection I found the lizard to be distinct from, 

 though closely allied to, Pseudopus. The absence of an ear- 

 opening being generally considered a generic character, I 

 propose for this new type the name of 



Hyalosaurus. 



Differs from Pseudopus in having the region of the ear 

 entirely covered with scales, without a trace of an external 

 ear-opening. 



Hyalosaurus Koellikeri. 



The shields on the head differ little from those of Pse^i- 

 dopus ; but the vertical shield forms a broad suture with tlie 

 posterior frontal, which occupies the entire width of the fore- 

 head, and a still broader one with the central occipital shield, 

 which is of an unusually large size and subtriangular in shape. 

 Dorsal scales in fourteen longitudinal series, of which the six 

 middle ones are obtusely keeled, the keels being more promi- 

 nent on the tail ; ventral scales in ten series. Rudimentary 

 hind limbs undivided, movable, very distinct. Brownish, 

 with a row of black specks along the middle of the back of 

 the anterior part of the trunk ; sides of a darker colour ; 

 abdomen greenish white. 



The length of the trunk of the single example is 5 inches ; 

 a considerable portion of the tail is lost, the remaining piece 

 being about as long as the body. 



XL. — Points of Distinction between the Spongiadce and the 

 Foraminifera. By H. J. Carter, F.R.S. &c. 



Having preliminarily described and sketched most of the 

 sponges in the British Museum, and having examined all 

 microscopically, in the general as well as in the private 

 collections of that institution, for the purpose (as desired by 

 Dr. Gray) of finally ])lacing them in some kind of order, and 



