Die nordischen Schizopoden. VI 97 



inner rami bifiircating into two narrow sub-equal processes, without any con- 

 spicuous basal enlargement. Telson sub-triangular, about as long as the sixth 

 Segment of pieon, apex narrowly truncate, beset with a central pair of setae and 

 a pair of spines on either side. The inner spines are tliree or more times as 

 long as the outer and about as long as the telson. Lateral margins entire, except 

 distally, where there are about three small spines on either side. Outer uropods 

 with the extremities somewhat squarely truncate. Inner uropods but little shorter 

 than the outer, armed inferiorly with a Single spine near the posterior end of the 

 otocyst. Colouration not noted when the specimens were taken. One retains a 

 crimson spot on the cephalic part of the carapace. Length of mature male and 

 female 9 mm." (I. c). 



Verbreitung: Bisher nur aus den irischen Gewässern bekannt. Wahr- 

 scheinlich eine Bodenform aus 200 — 400 F. Tiefe. 



56. Dactylerythrops bidigitata Tattersall. 



1907. Dactylerythrops bidigitata Tattersall, Ann. nat. bist. ser. 7 v. 19, 



p. 109—111. 



„Carapace covering all the thoracic segments; cervical sulcus well marked; 

 produced in front into a broadly rounded obtuse rostrum whicli reaches to about the 

 cenlre of the eyes; antero-lateral corners rounded; emarginate on its posterior border. 



Pleon longer than the carapace; the first segment one and a half times as 

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

 longer than the fourth, sixth segment twice as long as the fifth. 



Eyes small with their basal parts covered by the rostrum; as far as can be 

 Seen, joined to each other at the base by a membranous integument such as is 

 described for D. dactylops; the outer distal corner produced into a rather long 

 digitate and flexible process; a shorter and firmer process on the inner and upper 

 face of the eye, which a raised ridge connects to the main parts of the eye, so 

 that the whole organ is triangulär in cross-section and not flat; visual Clements 

 much more numerous than in D. dactylops, confined to a triangulär area on 

 the outer part of the eye at the base of the outer process; pigment confined to 

 the Visual Clements, pale purplish pink in freshly preserved specimens. 



Antennular peduncle rather short, with the third Joint a little longer and 

 very much stouter than the first and more swollen in the male than in the female; 

 second Joint small; male appendage well developed, but only slightly hirsute, as 

 the specimen is still immature. 



Antennal peduncle shorter than the antennular and having the second Joint 

 slightly larger than the subequal first and third joints. 



Antennal scale almost twice the length of the antennular peduncle; about 

 four to four and a half times as long as broad; outer margin entire and ending 



Nord. Plankton. ** • 



