VI 98 Carl Zimmer. 



in a strong spine, beyond wliicli tlie apcx of the scale is not produced; no spine 

 on the basal Joint. 



Mouth-parts fundamentaliy as in the genus Amblyops. 



First and second thoracic Mnibs hkewise agreeing with those of the genus 

 Amblyops, except that the second Hinb is comparatively longer. 



Reinaining thoracic limbs broken away. 



Exopods of all the thoracic limbs with the outer distal corner of the basal 

 Joint slightly acuminate; flagelliform part well developed and composed of about 

 seventeen joints, 



hicubatory lamellae of the female, two pairs. 



Pleopods in the only male, which is immature, have the inner brauch of 

 the first pair already more developed than in D. dactylops and armed with many 

 more setae; otherwise they conform to the Amblyops type. 



Telson comparatively short; about two thirds (slightly less) of the length of 

 the last Segment of the pleon; subtriangular in shape; one and a half times as 

 long as broad at its base; margins tapering evenly to a bluntly rounded apex; the 

 distal third of its margins armed on each side with ten rather stout spines in- 

 creasing slightly in length towards the apex; a pair of median plumose setae situated 

 at the apex between the terminal spines of the margins. 



Uropods moderately slender: inner, one and two-thirds of the length of the 

 telson, apparently without spines on its inner margin; outer, twice the length of 

 the telson. 



Length of a mature female 16 mm, of an immature female 14 nnn, and of 

 an immature male 15 mm." (I. c.) 



Verbreitung: Bisher nur aus den irischen Gewässern (750—800 F. 

 Tiefe) bekannt. 



57. Dactylerythrops gracilura Tattersall. 



1907. Dactylerythrops gracilura Tattersall, Ann. nat. hist. ser. 7 v. 19, 



p. 111 — 112. 



„Carapace covering all the thoracic Segments; broadly and evenly rounded 

 in front, without any trace of a rostral projection; antero- lateral corners rounded; 

 emarginate on its posterior border. 



Pleon a little longer than the carapace: first segment a little shorter than 

 the second, which is subequal to the third and fourth; fifth segment slightly longer 

 than the fourth; sixth segment one and a half times as long as the fifth. 



Eyes very small, almost entirely covered by the carapace; very thin and 

 membranous; united at their bases by a membranous integument; outer distal 

 corners produced into a very acute fairly long flexible precess; a shorter and less 

 acute process on the inner corner; visual Clements very imperfectly developed, 

 confined to a small deeply-seated mass at the base of the outer process; no pig- 

 ment observed in preserved specimens. 



