Mr. J. W. Salter on new Fossil Crustacea 



by me in the communication above referred to, which is correct 

 so far as it goes, but now requires additions. 



In the second edition of f Siluria/ 1 859, a supposed correction 

 was published by me with respect to the position of the carapace. 

 No specimens had till then been found that had the body-rings 

 actually in connexion with it; but the occurrence of a third speci- 

 men (fig. 3.) with all the parts in situ, has shown more clearly 

 that the position of the abdomen given in ' Siluria ' was not the 

 true one, but that it had been (singularly enough, in both cases) 

 forced forwards, so as to protrude from the anterior end ! Figure 3 

 only has the parts in right position, and all three figures belong 

 to the same species Ceratiocaris papilio. 



Fig. 1. \ Fig. 2. Fig. 3. 



7 



Ceratiocaris papilio, Salter*. 



The three figures show the animal in various postures in the stone : 

 Fig. 1 . The valves closed, but with the abdomen bent round and protruding 



from the front of the carapace. 

 Fig. 2. A specimen similarly distorted, with the valves open. The dotted 



lines show the proper position in both figures. 

 Fig. 3. shows all the parts in situ, with the jaws, e ; rostrum,/; antennae 



(or thoracic appendages?),^; a, b, thorax and abdomen; c, telson ; 



(f, caudal appendages. 



* See ' Siluria,' 2nd ed. p. 26'2, f. 1,2. 



