of the limbs as occasionally seen extended beyond the edges of the body. The 

 genus is chiefly characterised by the flat clypeiform body, the absence of an eye 

 and of a true rostrum, the great development of the mandibular palps, and the 

 structure of the 1st pair of legs. In addition to the typical species described 

 below, the 2 forms recorded by A. Scott from Ceylon as Dactylopusia laticaudata 

 and D. cemida, seem to be referable to the present genus. 



85. Idomene forficata, Philippi. 



(PI. LXXXII). 



Idomene forficata, Philippi, Fernere Beobachtungen iiber die Copepoden des Mittelmeeres. Archiv 

 f. Naturgeschichte 1843, p. 65, PI. Ill, fig. 4. 



Syn: Dactylopus flavus Brady, male (not Glaus). 



Specific Characters. Female. Body comparatively short, clypeiform, attenu- 

 ated behind. Cephalic segment large and expanded, evenly rounded in front, 

 lateral corners acutely produced. Epimeral plates of the 3 succeeding segments 

 laterally extended and terminating behind in an acute point. Last segment of 

 metasome much narrower than the preceding ones, and without distinct epimeral 

 plates. Urosome scarcely more than half the length of the anterior division, 

 genital segment nearly twice as broad as it is long, and imperfectly divided in 

 the middle, last segment cleft almost to the base. Caudal rami considerably 

 longer than they are broad, and slightly tapering distally, apical setae comparatively 

 short, the innermost one transformed to a strong mucroniform spine. Anterior 

 antennae narrow and gradually tapering distally, 7-articulate, terminal part about 

 half the length of the proximal one. Posterior antennae with the outer ramus about 

 the length of the terminal joint of the inner, and provided with 6 setae, 4 lateral 

 and 2 apical. Mandibular palp with the basal part very broad and expanded, 

 having a transverse row of delicate spinules across the middle, and 4 marginal 

 setae; rami of about equal size, the outer one armed outside with 3 remarkably 

 strong spines, finely ciliated along one of the edges. 1st pair of legs with the 

 inner corner of the 2nd basal joint considerably projecting and armed with a 

 strong deflexed spine; outer ramus a little shorter than the 1st joint of the inner, 

 exterior margin, as also the spines, coarsely spinulose, last joint short and ob- 

 liquely truncated at the tip, carrying 3 spines and 2 geniculate setae; 1st joint of 

 inner ramus oblong trigonal in form, inner edge angularly bent in the middle, 

 the outer 2 joints comparatively short, each with a ciliated seta inside, apical 

 claws strong and slightly unequal in length. Last pair of legs with the distal joint 

 comparatively small and armed with 5 marginal spines, the 3 outer ones very 



