13. IMULLUPiEKYX. 197 



e. Adult females. New South Wales. From Mr. Macloay's Col- 

 lection. 



f. Adult females. Port Jackson. Voyage of the ' Herald.' 

 g-i. Adult males. Australia. 



This species varies a little in the form of the principal processes, 

 but none of the variations proves to be a constant character. 



2. Phyllopteryx eques. 

 Giinth. Proc. Zool. Soc. 1865, p. 327, pi. 15. 



D. 37. Osseous rings 19 + 36. 



The snout is as long as the distance of the front margin of the 

 orbit from the hind part of the nape ; it bears a pair of small 

 spines behind the middle of its upper edge, a pair of minute barbels 

 at the chin, and a pair of long appendages in the middle of its lower 

 part. The forehead bears an erect, broad, subquadrangular crest, 

 with a shorter single spine behind ; a horizontal spine above each 

 orbit ; a cluster of spines with narrow appendages on the occiput. 

 Nape of the neck with u long spine, dilated at the base into a crest, 

 and carrpng a long bitid appendage. 



The trunk is compressed, somewhat dilated, stronglj' arched on 

 the back, and with two deep indentations in its lower profile. The 

 spines are of three kinds: — 1. The band-bearing spines are the 

 strongest, strongly compressed, not flexible, each terminating in a 

 pair of short points. There are one pair of these spines in the 

 middle of the back, and one on each of the three prominences of the 

 abdominal outHne ; the flaps are long and bifid. 2. Very long, 

 compressed, and somewhat flexible spines, without appendages ; 

 these occupy in pairs the uppermost part of the back, and in a single 

 series the median line of the belly. 3. Small, short, conical spines 

 run in single series along the median line of the sides, and along the 

 lateral edges of the belly ; a pair of similar spines in front of the 

 lower part of the base of the pectoral fin. Tail quadrangidar, with 

 sharp edges, and witli five pairs of band-bearing spines along its 

 upperside. Dorsal fin situated entirely on the tail. 



Australia. 



a. Type of the species. Port Lincoln. Presented by G. F. Augas, 

 Esq. 



/3. Bodtj as broad as deq) : IIaliichthys. 



3. Phyllopteryx tseniophorus. 



Haliichtbys t;uuiopliora, Graij, I'ruc. Zoo!. Sue. 1859, p. iJ8, pi. 7. 



D. 25. Osseous rings 21-f-45. 



Body as broad as deep, as long as the tail. Each shield ^vith a 

 prominent spine on each edge, except on the lowerside of the pre- 

 hensile ])ortion of the tail. Snout with a pair of spines above, in 

 the middle of its length. A pair of supra- and infraorbital spines ; 

 several spines on the median line of tlie crown and nape. Manj' of 

 the spines are band-bearing, but these do not dift'er in form or size 



