228 



147. Stenocopia longicaudata (Scott). 



(PI. CLI & CLII). 



Ameira longicaudata, Th. Scott, Additions to the Fauna of the Firth of Forth : 10th Ann. Rep. 

 of the Fishery Board for Scotland, Part III, p. 250, PL IX, figs. 118. 



Specific Characters. Female. Body comparatively slender, and, viewed 

 dorsally, of almost equal width throughout. Cephalic segment rather large and 

 deep, with the lower edges strongly curved, rostral projection small but distinct, 

 blunt at the tip. All the body-segments finely spinulose at the hind edge dorsally. 

 Urosome, including the caudal rami, exceeding in length the anterior division, 

 genital segment not dilated in front, and almost as long as the 3 succeeding 

 segments combined; last segment considerably smaller than the preceding one, 

 anal opercle small and finely ciliated at the edge. Caudal rami exceedingly 

 slender and narrow, equalling in length Ihe 3 posterior caudal segments combined, 

 apical setae much elongated. Anterior antennse fully twice the length of the cephalic 

 segment and gradually attenuated distally, 1st joint about the length of the 2 

 succeeding joints combined, terminal part of about same length, and having the 

 last joint much the largest. Posterior antennse with the outer ramus rather 

 slender and distinctly biarticulate, last joint very small and carrying one apical 

 and one lateral seta. 1st pair of legs moderately slender, outer ramus shorter 

 than the 1st joint of the inner, its last joint nearly as long as the middle one, 

 and armed with 3 clawlike spines and 2 geniculate setse; inner ramus with the 

 1st joint more than twice as long as the other 2 combined, seta of the inner 

 edge remote from the apex, last joint a little longer than the preceding one, and 

 carrying on the tip a moderately long claw and 2 unequal setse. Natatory legs 

 of normal appearance, inner ramus shorter than the outer, especially in the 4th 

 pair. Last pair of legs with the distal joint narrowly exserted at the end, and 

 only ciliated along the outer edge, marginal setae 5 in number and sowewhat 

 unequal; inner expansion of proximal joint rather broad and extending to about 

 the middle of the distal joint, marginal setse 5 in number. 



Male resembling the female in its general appearance, though easily recog- 

 nizable by the hinged anterior antennse. 1st pair of legs with the spine inside 

 the 2nd basal joint slightly transformed, being somewhat hamate at the tip. Last 

 pair of legs with the distal joint much smaller than in female and fusiform in 

 outline, having an additional seta inside; inner expansion of proximal joint verj 

 slight, with only 3 marginal setse. 



Colour in both sexes a dark grey. 



Length of adult female 0.82 mm. 





