CALLIOPIIDAE 



161 



Halirages regis (Stebb.) (Fig. 94). 



Stebbing, 1888, p. 902, pi. Ixxiii (liiixleyanus, non Bate); 1906, p. 291 {huxleyanus, nan Bate); 

 1914, p. 362, pi. viii (Bovallia /-.). 



Occurrence: St. 56. Falklands. 1 ovig. $ 14 mm. 



Remarks. Very close to huxleyanus but at once distinguished by the strong imbrica- 

 tion of the peraeon segments over the side-plates, by side-plates 1-5, and by the 2nd 

 joints of peraeopods 3-5, especially peraeopod 3. 



Side-plates 1-4 subtriangular, narrowing below, not overlapping, but separated 

 almost from their bases. Anterior lobe of side-plate 5 as deep as, and diverging rather 

 strongly from the posterior lobe, subacute below. In this respect Stebbing's 1914 

 figure of the whole animal does not conform, but he gives no detailed figure. 



Eye much larger than in any of the specimens of huxleyanus, obliquely oval. 



d c. 6. 



Fig. 94. Halirages regis (Stebb.). a. Head, b, c, d. Side-plates 5-7 

 and 2nd joints of peraeopods 3-5 respectively. 



Peraeopod 3, 2nd joint comparatively narrow, oblong, hind margin straight. Peraeo- 

 pod 4, 2nd joint also oblong but broader. Peraeopod 5, 2nd joint oblong, but narrowing 

 distally, hind margin distally concave. Postero-inferior corners in all three peraeopods 

 quadrate. 



The colour is given as "white very heavily mottled with deep crimson". 



There is no question but that for the present these two forms should be kept separate. 

 Stebbing (1914, p. 362) says that Mr Vallentin "on March nth... found the sea 

 teeming with it \huxleyanus\\ If a few hundreds of specimens could be captured and 

 examined, the status of huxleyanus and regis might be satisfactorily determined. 



Distribution. Falkland Islands. 



Genus Stenopleura, Stebb. 

 Stebbing, 1906, p. 302. 



Stenopleura atlantica, Stebb. 



Stebbing, 1888, p. 950, pi. lxxxiv. 

 Stephensen, 1915, p. 45, fig. 27. 

 Schellenberg, 1926, p. 353; 1926 b, p. 227. 



