Stenhouse. — On the Anatomy of the Pig-fish. Ill 



mens red is by far the prevailing colour. The red colour soon 

 fades in dried specimens, and even more quickly in alcohol. 



Diameter of the disc 6-3mm. Length of arm from centre of 

 disc about 72mm. Width of arm close to the disc, without its 

 spines, 0-9mm. Length of longest arm-spines about 0-6mm. 

 Length of radial shield l-52mm.; breadth 0' 45mm. Length of 

 upper arm-plate near the disc 0-47mm. ; breadth 0-72mm. 

 Length of lov^'er arm-plate 0"5mm. ; breadth 0'4mm. 



This species, I should say, would find its place in the 

 " Table of Species of Amphiura" given by Mr. Lyman in his 

 Monograph ("'Challenger' Eeport," vol. v., Ophiuroidea, 

 p. 123) near Amphiura hcllis, to which it appears to be closely 

 allied. It can, however, be readily distinguished from that 

 species by the coarser and irregular scaling of the disc and the 

 shape of the under arm-plates and mouth parts. 



EXPLANATION OP PLATE IX. 

 Fig. 1. Amphiura rosea, above xl5. 

 Fig. 2. „ below x 15. 



Fig. 3. „ arm-spines in profile x 15. 



Abt. VII. — 071 the Anatomy of the Pig-fish (Agriopus 

 leucopoecilus) . 



By Andrew Stenhouse, M.A. (From the Biological Labora- 

 tory of the University of Otago.) 



Communicated by Professor T. J. Parker. 



[Bead before the Otago Institute, 9th October^ 1893.] 



Plates X.-XIII. 



A. External Characters. 

 The height at the nape is considerable, and is due to two 

 causes : 1st, the limb-girdles, but especially the pelvic, are 

 carried downwards and forwards and lie lower tlian and 

 partly beneath the operculum and branchial arches ; 2nd, the 

 muscular tissues containing the dorsal interspinous bones are 

 well developed and lie higher than (and in front, over) the 

 cranium. The limb-girdles form a strong pad covered with 

 thick skin on which the compressed body may rest. The 

 following are some of the measurements taken : Average 

 height, 2-9in. ; average height with dorsal, 4 -Gin. ; head, 

 2-3in. ; snout, jf^n. ; average total length, 9'5in. ; orbit 

 (vertical), 0-55in. ; orbit (liorizoutal), 0-64in. The orbit, of 



