LOPHOBRANCHII. 23 



The solitary specimen in the British Museum came from 

 India. A female in the Paris Museum was obtained by M. 

 Busseuil on the coasts of New Holland, during Bougainville's 

 Expedition. It is rougher and darker coloured. The one de- 

 scribed by Jenyns, in the ' Voyage of the Beagle,' is slightly 

 speckled on the dorsal. His example from Tahiti differs in the 

 numbers of its rays, as shown below : — 



Radii.—?. 17 ; D. 31 ; A.? 3; C. 10, Jenyns. 

 P. 18; D. 21; A.? 2; C. 10, Kaup. 



Dimensions of the 



3 ¥ 



Length of the head 0'6 in. - 6 in. 



From tip of snout to anus 23 „ 2'2 ,, 



Length of the tail 3'6' ,, 3'0 „ 



Genus 2. TRACHYRHAMPHUS, Kp. 



Diagn. — The three species of this genus hitherto discovered 

 resemble Halicampus ; but the head is longer, and the snout is 

 denticulated on its dorsal aspect only, and is not so distinct 

 from the head. Five or six rings, three of which appertain to 

 the body, support the elevated base of the dorsal fin. The 

 breast-ring is no wider than the head. All the species are still 

 more elongated in form than Halicampus. 



1. Trachyrhamphus serratus, Kp. 



Syngnathus serratus, Ternm. et Schl. F. Jap. 1. 120. f. 4. 



Russel, t. 130. 

 Typhlus rostro cristato-serrato, Par. Mus. 



Diagn. — Snout arched, shorter than the space intervening be- 

 tween the proximal corner of the eye and the extreme edge 

 of the gill- cover. 



Descr. — This species, allied nearer to the following than to 

 the preceding one, has a more elongated form and less elevated 

 superciliary ridges, combined with more out- springing orbits. 

 It has the dorsal aspect of the head more even, and more feebly 

 shagreened, and its operculum is marked by fine streaks pro- 

 ceeding from a prominent line. The snout has a spiny crest on 

 its dorsal aspect only. There are 21 body-rings and 78 rings in 

 the tail. The dorsal fin stands on 5 rings, three of them belong- 

 ing to the body. On its ventral aspect the breast-ring is com- 



