162 ADDITIONS TO THE FAUNA OF CORNWALL. 



union -with that of the other side. The fronto-parietal crest is 

 subtriangular, and commences immediately behind that swelling ; 

 it is slightly thickened. Maxillary extremely feeble. Vertebrae 

 11/11. The first interneural spine is very strong, much longer 

 and stronger than the others (which are thin and styliform), flat, 

 isabre-shaped, and descends to ^ove the occipital foramen, in front 

 of the first neural spine, which is still stronger than the bone just 

 described. The second neural spine has a broad basal portion 

 which passes abruptly into the upper thin and styliform portion. 

 One interneural generally corresponds to a neural. All the inter- 

 neurals are so much dilated above that their upper extremities 

 appear to be united by one semiossified ligament, which extends 

 from the parietal crest to the end of the dorsal. The first rib is 

 attached to the third vertebra, the tenth vertebra is without rib ; all 

 the ribs are anchylosed with the centra of the vertebra, opposite to 

 the base of the neural spines. The haemal of the eleventh ver- 

 tebra is extremely long and slender, arched forward, and passing 

 into a semiossified ligament which, similarly to that on the dorsal 

 outline of the skeleton, unites the extremities of the interhsemals, 

 extending from the end of the anal to the pubic bones, and forming 

 a complete but feeble ring round and supporting the abdominal 

 cavity. The pubic bones are very short and coalesced, but slightly 

 divergent behind, so as to leave a narrow opening for the vent, 

 which can be entirely closed by the rudimentary and coalesced but 

 ossified ventral fins, which serve in this fish as a sphincter ani. 



The formula of fin-rays of this specimen are : — D. 13. A. 14. 

 C. 7+16 + 6. P. 15. 



