672 PROP. R. COLLETT ON A NEW AGONOID FISH. [Nov. 20, 



The dorsal keel (coalescing with the keel on the other side at the 

 15th plate in front of the caudal fin) is consequently composed of 

 38 to 39 plates ; the lower lateral keel, extending from lower base 

 of the caudal to base of the 10th pectoral ray, contains 35 plates. 

 Abdominal plates numbering : — 



Plates. 



From ventrals to anal (Pair) 11 



The anal extending over „ 10 



Prom anal to caudal (Single) 17 



The abdominal keel (coalescing at the 17th plate in front of the 

 caudal) is formed by a series of 38 plates. 



Lateral line distinct; 38 pores. 



Fins. — In the 10 specimens, at present preserved in the museum 

 at Christiania, the fin-rays are the following : — 



1 D. 8 2 D. 8 A. 10 P. 17-17 



8 9 10 ? 16 



8 9 10 16-16 



8 8 10 15-16 



8 8 10 17-17 



8 8 10 17-17 



8 8 10 16-17 



8( + l) 8 11 16-17 



8 8 10 15-16 



8 9 10 17-17 



First dorsal begins behind the fourth dorsal plate and has 8 rays 

 (one specimen has an additional slender ray in the space between 

 the two dorsals). Its height equals its distance from the head. 

 It extends over 8 scales ; the first two rays in the space between 

 the fourth and fifth plate. 



The dorsal fins are separated by 3, sometimes by 4 plates. 



Second dorsal has 8, sometimes 9, rays, and extends over 8 

 plates ; behind the last ray is one pair of plates, before the unpaired 

 series begins. 



Anal has commonly 10 rays (in one specimen 11) ; its height 

 equals that of the 2nd dorsal, and is rather less than that of the 

 1st dorsal. It commences between the 11th and 12th pairs of 

 scales in the abdominal series. 



Ventrals short in the female, shorter than the vertical diameter 

 of the eye ; longer in the male, equalling the length of the snout. 

 Each has one short spine and three articulated rays, two of which 

 are divided to their base. They are received in a longitudinal 

 common groove (" Fodothecus "). 



Fectorcd has 16-17, rarely 15 rays, some of which are sometimes 

 branched in their upper half, but not always. The first ray is 

 short, about equal to half the second ray ; the lowermost rays a 

 little thicker than the rest. Its form is a little emarginate, the 

 5th lower ray being a trifle longer than the 6th and 7th. The tip 

 extends to a distance from the anal of 2 or 3 plates. 



