158 PHILOSOPHICAL TRANSACTIONS. [aNNO 1786. 



lamellae are the epiphyses of the vertebrae, and are alike in all quadrupedes, to 

 which class all the cetaceous fishes belong. When we consider the structure in 

 general of these last, we find the hind legs only are wanting, and of course the 

 ossa innominata ; but the ossa pubis are very remarkable in all of them. 



Fig. 5 is a fossil vertebra of the unknown animal, whose bones are so often 

 met with in St. Peter's Mountain at Maestricht. abcd is the body ; cikef the 

 spinous processes ; cki the medullary canal, running under kef, in a direction 

 parallel to if, and coming out again at f. The remaining marks of the lamel- 

 lated epiphyses, id and ab, are evident proofs of the analogy between these and 

 the vertebrae of the cetaceous fishes ; and also of their want of resemblance to 

 the vertebrae of the crocodile, as will appear by comparing the 1st and 2d figures 

 with the 5th. 



Fig. 6 is a very accurate drawing of one of the fossil teeth belonging to the 

 same incognitum. abc is its point, of a lanceolated figure, whose edges, ba 

 and AC, are dentated ; bc is the root, uneven, bony, fixed within the socket 

 with DGP ; DGBC is covered with the gums; hi is an oval sinuosity, in which 

 generally the secondary teeth are generated, as is seen in fig. 8, representing a 

 fragment of the upper jaw-bone of the same incognitum, abcde. The teeth in 

 all the physeteres and delphini have solid roots, except in the young ones, in 

 which they often have cavities to receive the blood-vessels and nerves. But the 

 crocodile has the teeth entirely hollow, as appears in 



Fig. 7 J in which the cavity riA® shows the difference between the crocodile's 

 teeth and those of the cetaceous and other fishes. This tooth is the anterior 

 one of a large head of a crocodile, 2 feet long, and of the same size as that in 

 the British Museum. A hollow tooth may however belong to a physeter, as 

 Dr. Otho Fabricius observes in his Fauna Groenlandica, p. 44, when speaking 

 of the physeter microps : of which he says, " Habet in maxilla inferiori dentes 

 22, utrinque I J arcuatoSj falciformes, intus ad apicem usque cavos," within they 

 are hollow to the very end. 



Fig. 8, Fragmentum maxillae superioris, lateris dextri capitis Physeteris in- 

 cogniti, ex Monte St. Petri, Traj. ad Mosam. Origo dentium serotinorum ex 

 ipsis radicibus solidis primo enatorum in quinque manifesta est. Quae ad den- 

 titionem banc singularem pertinent, ex fig. 2, Tab. Fragm. similis sed Maxil. 

 inf. 12 Aug. 1784. peti debent. 



XXVll, Catalogue of One Thousand New Nebulce and Clusters of Stars. By 



miliam Bersch^l, LL. D., F. R. S. p. 457. 



The following catalogue, which contains 1000 new nebulae and clusters of 



stars, is extracted from a series of observations, or sweeps of the heavens, <vhich 



was begun in the year 1783, and which I am still continuing till the whole be 



