56 THE ROYAL SOCIETY OF CANADA 



Lepeophtheirus parvicruris new species 

 Pl. V, Figs. 62- 76 



Female: Body long on account of the great length of the abdomi- 

 nal segment. Carapace somewhat quadrate, length and breadth 

 equal; truncated anteriorly and posteriorly; lateral grooves well in 

 from the margin; transverse groove less than one-third the distance» 

 from posterior border to anterior; posterior sinuses narrow and deep; 

 lateral lobes broad, extending as far posteriorly as the median lobe; 

 median lobe little rounded, four-ninths the width of the carapace. 

 Free thoracic segment short, little more than half the width of the 

 median lobe. Genital segment as broad as long, narrowing somewhat 

 anteriorly but scarcely at all posteriorly; posterior lobes not showing 

 in dorsal view; ventrally the two pairs of rudimentary legs are visible 

 but they are but slightly developed, not even the setae of the fifth 

 pair showing dorsally. Abdominal segment undivided, somewhat 

 longer than the genital segment, of uniform width but tapering slight- 

 ly posteriorly. Anal laminae small, widely separated, each with three 

 long setae medially placed and three small ones, two to the outside 

 and one to the inside of the larger. Egg strings long, as long as the 

 whole body, with nearly 100 eggs in each. 



First antennae short and stout, projecting little past the carapace. 

 Second antennae, each with a blunt spine at the postero-medial angle 

 of the base and a short spine on the distal margin of the basal joint; 

 the terminal joint slender with the curve abrupt. Maxillary hook 

 abruptly narrowed near the base, the remainder tapering but little. 

 The first maxilla is constricted below the rami; these are of the same 

 size, shorthand rather blunt. Furca with a base long, but narrower 

 than the fork and tapering; the rami, short, blunt, irregular, with the 

 sinus between them rounded. Second maxilla slender, without spines, 

 the terminal joint being much larger than the basal. Maxilliped with 

 stout base and sharply tapering terminal joint. 



First swimming leg with posterior basal spine short; a small 

 spine or claw at the distal end of the intermediate joint. In the second 

 leg, the joints of the exopod and endopod are stout as compared with 

 the size of the basal joint. The third leg is of the usual type, with the 

 basal spine of the exopod short. The fourth leg is very small, almost 

 minute when compared with those of other species. There is a small 

 spine near the distal end of the basal joint; there is but one interme- 

 diate joint which is provided with a claw distally ; the terminal joint is 

 slightly longer than the intermediate; it has four spines, two of them 

 much shorter than the other two, and one of them quite small, like a 



