436 ADDENDA. 



commences behind the second dorsal ; the anterior part of it, which 

 is composed of the strongest rays, is inserted in the abdominal mem- 

 brane, without being in any connexion with the vertebral column ; 

 the posterior part, which is inserted between the muscles of the tail, 

 is composed of feeble rays only. Caudal forked, more than half as 

 long as the head ; pectoral as long as the head (without snout) ; 

 ventral only half as long as the pectoral, inserted below the root of 

 the latter fin. 



Entirely black. 



Madeira. 



a. Type of the species. Presented by J. Y. Johnson, Esq. 

 h. Two inches and three-quarters long ; taken at a depth of 312 

 fathoms. From the Collection of the Rev. R. T. Lowe. 



lines. 



Total length 43 



Length of the head 10£ 



Depth of the head 4^ 



Diameter of the eye 2f 



Length of the upper jaw 8 



These two are the only specimens of this species which have ever 

 been discovered. Mr. Lowe obtained his at Magdalena as far back 

 as the year 1850, but omitted to give at description of it. The second 

 specimen was obtained by Mr. Johnson in the course of last year, 

 who, recognizing in it the type of a new genus, gave a very detailed 

 account of it, without assigning to it its place in the system. He 

 appears to have overlooked a part of the fin-rays, the posterior of 

 which are very small, and easily escape observation. 



