94 MEMOIRS OF THE QUEENSLAND MUSEUM. 



SWALLOWTAIL. 



Dart (New South Wales). 



(Plate XXVIII.) 



Type localities: — Vizagapatam, B.I. (8. ootla). 



Vizagapatam, B.I. {T. russelii). 

 Java (T. oblongus). 

 Percy Islands, M.Q. (T. coppingeri) . 

 Moreton Bay, S.Q. (T. vclox). 



Body deeply subovate and strongly compressed, the dorsal and ventral 

 contours symmetrical or nearly so, the former linear or gently rounded and 

 moderately acclivous from the frontal region to the soft dorsal, the latter feebly 

 convex from the chin to the ventrals, between which and the anal it is linear or 

 slightly emarginate ; width of body 3 to 3-25 in its depth, which is 2-3 to 2-7 in 

 its length and from one third to five ninths more than the length of the head ; 

 abdominal region moderate, 14 to 1-67 in the length of the anal ; caudal peduncle 

 one third to one half longer than deep, its least depth one tenth less to two 

 ninths more than the eye-diameter. Head rather small, its length 3-45 to 4 in 

 that of the body, its width 1-75 to 2 in its depth, which is 1-3 to 1-1 in its length ; 

 cranio-nuchal keel well developed. Snout short, pointed in the young, becoming 

 blunter with age, the upper profile rounded, its length from one sixth less to as 

 long as the eye-diameter, which is 3-2 to 3-85 in the length of the head ; adipose 

 lid little developed ; interorbital region elevated and sharply rounded, its width 

 as much as to one eighth more than the eye-diameter. Jaws equal in the adult, 

 the upper the longer in the young ; maxillary extending to below the middle or 

 anterior border of the pupil, its length 2-45 to 2-85 in that of the head, the width 

 of its truncate distal extremity from one fifth more than to twice its distance from 

 the eye and 2-8 to 3-6 in the eye-diameter. Preopercle with broadly rounded 

 angle, the membranous border crenulate in the young, entire in the adult, the 

 hinder limb inclining slightly forwards. 



Both jaws with a narrow band of rather coarse villiform teeth, the outer 

 row slightly enlarged ; vomer with a triangular patch, palatines with a narrow 

 band of similar teeth ; pterygoids and tongue toothless. 



Scales small and rounded on the trunk, becoming gradually larger and 

 more ovate posteriorly; cheeks and postorbital region scaly; rest of head and 

 nuchal ridge naked. Lateral line with a feeble curve anteriorly, thence straight 

 or gently sinuous to the caudal fin, the pores 88 to 95. 



Dorsal fin with vi, i 23 to 26 rays ; procumbent spine, strong and exposed ; 

 spines short and separate except in the very young, graduated evenly from the 

 front, the last 1-4 to 2 in the eye-diameter. Soft dorsal originating from one 

 fifth to a little nearer to the root of the caudal than to the tip of the snout, the 



