74 Miscellaneous. 



"the heart gives off branches in front and at the sides." M. 

 Blanchard figures four pairs oi jmeruno-cardiae vessels, which bring 

 the blood from the lungs to the heart, and three pairs of arteries 

 issuing from the heart. There exists onlj- two pairs of pneumo- 

 cardiac vessels, or pulmonary veins ; these are constituted by pro- 

 longations of the pericardium. Those of the anterior pair collect 

 the blood from the anterior lungs and open into the pericardium 

 opposite the anterior apertures of the heart : those of the posterior 

 pair receive the blood from the posterior lungs and discharge at the 

 level of the intermediate apertures. Further back many pro- 

 longations of the pericardium are seen, but these only form ligaments 

 uniting the heart to the dorsal integument. 



As for the vessels which carry the blood away from the heart. 

 we may distinguish the following. At the level of the median 

 cardiac apertures there arises, on the .inferior face of the heart, a 

 pair of large lateral arteries which ramify abundantly and irrigate 

 the antei-ior portion of the abdomen. At their origin they are 

 separated one from the other by two hypocardiac ligaments. Eelow 

 the posterior apertures there arise, like the foregoing, two other 

 lateral arteries of rather narrow diameter, and, between the bases 

 of these, there detaches itself from the heart a capacious trunk 

 which takes a vertical direction. It soon gives rise behind to a 

 branch which I consider as corresponding to the caudal artery of 

 the other Araneida ; then, having reached the upper surface of the 

 intestine, near the posterior portion of the rectal sac, this large 

 artery divides into two branches, which pass one to the right and 

 the other to the left of the alimentary canal, and ramify in order to 

 bathe the posterior region of the abdomen. — Comj:>tes Hendus, 

 t. cxvi. no. 16 (April 17, 1893), pp. 828-830. 



On further Evidences of Deuterosaurus «»rf Ehopalodon/rom 

 the Permian Rods of Russia. By H. G. Seeley, F.li.S. 



The author endeavours to separate the Labj-rinthodont remains, 

 distinguished by having teeth anchylosed to the jaw, from such as 

 belong to animals having a Theriodont type of dentition. The 

 genera founded upon cranial fragments which show the Theriodont 

 type are Deuterosaurus, Rhojxdodon, and Dinosaurus. The skull in 

 Beuterosaurus is described from new materials, which make known 

 the structure of the palate and other cranial structures. The palate 

 is of Plesiosaurian type. The back of the skull is a vertical plate, and 

 the brain-cavity rises in a long vertical tubular mass to the parietal 

 foramen. The quadrate bones descend below the foramen magnum 

 in a way that is best compared with Plesiosaurs. 



The articular end of the lower jaw is identified among bones 

 figured by von Meyer. 



The skull of Rhopalodon is nearly complete, and has a general 

 resemblance to the skull of the South-African Dicynodont PtifcJio- 

 f/nathus. The orbit is defended with a sclerotic circle of bones. 

 Whereas in Dei(terosavrusthcTe is only one molar tooth, in RhopaJodon 

 there are apparently eight molar teeth, which have the posterior 

 edge finelv serrated. 



