64 THE ROYAL SOCIETY OF CANADA 



Chondracanthus pinguis, Wilson 



Chondr acanthus pinguis. Wilson, Contr., to Can. Biol., 1912, p. 94. 



Besides the host, Sehastodes auriculatus, given by Wilson, this 

 species has been found on Sehastodes pinniger, Hexagrammus decagram- 

 mus, Scorpœnichthys marmorata and Anoplarchiis atropurpureus. 



Chondracanthus rectangularis, new species 

 Pl. VIII, Figs. 101-109 



Female: Body long and slender, with no processes but the pos- 

 terior. Céphalothorax, short, much broader than long, rounded 

 posteriorly and anteriorly. Second thoracic segment much narrower 

 than the head dorsally but broader ventrally. The third segment is 

 about the same breadth as the head and is marked dorsally by a band 

 running transversely along the anterior border; from this band of 

 much the same width, passes backward along the median line for 

 about three-fourths the distance to the posterior margin of the thorax. 

 The remainder of the thorax tapers very gradually; one slight indenta- 

 tion on each side is present. The posterior processes are long and 

 tapering. Genital segment small, about one-third the width of the 

 body. The abdomen is narrow where it joins the genital segment, 

 suddenly becomes almost as broad as the segment, but soon narrows 

 quickly again and tapers to a rounded end. Egg strings long and slen- 

 der, the same length as the body; eggs large. 



The first antennae are large, rounded and blunt, without any 

 indication of joints. Second antennae long, slender and straighter 

 towards the tip than usual. Mandible but slightly curved, with teeth 

 on both sides. The terminal joint of the maxilla has several teeth 

 (9 or 10) on the posterior border, so much so that practically all this 

 border is toothed; a spine from the base passes out parallel to the 

 terminal joint. In the maxilliped, the terminal spine is supported on 

 a papilla-like prominence and is turned backward so that it is not in 

 line with the joint that supports it. The two pairs of legs are similar 

 bilobed structures. 



Total length 8-3 mm., length of céphalothorax 1-3, width 2-0, 

 greatest width of body 2 -3, egg strings 8- 1 long and 0-25 broad. 



Male: Body moderately stout. Céphalothorax longer than broad 

 and broader than deep. No indication of separation between the 

 head and first thoracic segment. The free segments gradually get 

 smaller as they go posteriorly. Genital segment longer but not broader 

 than the last thoracic. Abdomen not clearly distinct from the genital 

 segment. Anal laminae long and tapering. 



