OOPEPODS OF THE WOODS HOLE REGION 



253 



segmented in male; genital segment divided in the male, undivided 

 in female; caudal rami longer than the anal segment and slender. 

 First antennae long and slender, 7-segmented, twice geniculate in 

 the male; second antennae with the basal endopod segment divided 

 and the 1-segmented exopod attached at the joint. Maxillipeds 

 strongly developed, the terminal claw slender, sinuate, pectinate 

 near its tip, and accompanied by an outside spine. Exopods of 

 swimming legs 3-segmented, endopods 2-segmented, both rami with 

 the setae reduced in number; the two segments of the fifth legs 

 completely fused into a single triangular 

 lamella, without distinction of parts, 



LEPTASTACUS MACRONYX (T. Scott) 



Figure 165 



Tetraffoniceps macronyx T. Scott, 10th Ann. Rep. 

 Fishery Board Scotland, pt. 3. p. 253, pi. 10, 

 1892. 



Leptastacus macromjx Sabs, Crustacea of Nor- 

 way, vol. 5, p. 417, suppl. pi. 40, 1911. 



OcmjLt^ence. — A few specimens of both 

 sexes were washed from the sand on the 

 shore of Katama Bay, Marthas Vineyard, 

 August, 1927. 



Distribution. — Scottish coast (T. Scott) ; 

 Norwegian coast (Sars). 



Color. — Body transparent and colorless, 

 without pigment markings; eye invisible. 



Female. — Cephalic segment one-fourth 

 the body length; rostrum spindle-shaped 

 with a minute seta on each lateral margin 

 near the center; urosome seven-tenths as 

 long as metasome, slightly tapered pos- 

 teriorly; genital segment not divided, 

 nearly as long as the two basal abdominal 

 segments combined; caudal rami slender, almost five times as long 

 as wide, somewhat divergent and tapered distally, each with two 

 apical setae, one outer, one inner, and one dorsal, all at the apex. 

 First antennae reaching the fourth thoracic segment, their three 

 basal segments equal in length, and together twice the length of the 

 other four segments. Endopod of first legs longer, of second, third, 

 and fourth legs shorter, than the exopod ; basal segment of first, sec- 

 ond, and third endopod with an inner seta ; fourth endopod half the 

 length of the exopod, without an inner seta. Exopod of first and sec- 

 ond legs without inner setae, of third leg with one seta on end seg- 

 71937—32 18 



F I G U E B 165. — Leptastacus 

 macronyx : a, Male, dorsal ; 

 6, male, second antenna ; c, 

 male, maxilliped ; H, male, 

 fifth leg ; e, female, fifth leg 



