62 THE ROYAL SOCIETY OF CANADA " 



the preceding thoracic segment but is not quite so broad. The 

 abdominal segment is small. The anal laminae are quite long and 

 each is armed with a terminal hook. 



The first antenna has a short basal joint and a longer terminal 

 joint; the latter has two lateral spines on its proximal half and four 

 terminal spines. The terminal joint of the maxilla is not so much 

 curved or so much turned forward as in the female and has not the 

 spines on the convex border. The other mouth parts and appendages 

 do not differ materially from those of the female. 



The swimming legs are feebly developed. The first pair has one 

 joint and a spine or claw and the second pair, an appearance of two 

 joints with two terminal spines or claws. 



Total length 0-88 mm., length of céphalothorax 0-55, width 

 0-40, depth 0-37. 



Colour: White. 



Naupliiis: Body obovate, nearly twice as long as broad; anterior 

 end broadly rounded, posterior end much more pointed. Balancers 

 short and slender. The wine-coloured pigment occurs in a single 

 large oval mass, a little nearer the posterior than the anterior end of 

 the body. Length 0-22 mm., width 0-12. 



Found in the gill cavity of Scorpœnichthys marmorata. 



Chondracanthus irregularis new species 



PI. VII, Figs. 94-100 



Female: Body stout, and on account of the many large processes, 

 very irregular, looking not unlike a portion of a vertebral column. 

 Céphalothorax broader than long; depth greater than the length 

 but not so great as the breadth ; more rounded anteriorly than poster- 

 iorly. Second thoracic segment narrower than the head and dis- 

 tinctly separated from it. A large process projects mid-dorsally 

 and two bi-lobed legs are present. The third thoracic segment is 

 larger; it has two small lateral process and a pair of legs similar to 

 those on the second segment. The remainder of the thorax is some- 

 what distinctly divided into two parts; the anterior portion is pro- 

 vided with a long dorsal process, two dorso-lateral processes and two 

 ventral processes that project laterally with smaller processes from 

 these projecting posteriorly; the posterior portion has a long dorsal 

 process, two small dorso-lateral processes, a ventral process or fold 

 and two large posterior processes. The genital segment is small and 

 rounded. The abdomen is less than half the width of the genital 

 segment. The egg strings are of large size. 



