95 



Gen. 19. Dermatomyzon, ciaus. iss<. 



Syn : Cyclopicera, Brady (part). 



Generic- Characters. General form of body resembling that in the pre- 

 ceding genus, the anterior division being rather tumid and evenly vaulted above. 

 Tail, however, composed in female of 4, in male- of 5 well-defined segments. 

 Anterior antennae not much elongated, though composed of a considerable number 

 of joints ; those in male imperfectly hinged and, at any rate in some cases, provided 

 with supplementary sensory filaments. Posterior antennae with the penultimate 

 joint comparatively short. Oral cone very little produced. Mandibles with the 

 masticatory part rather strong, knife-shaped ; palp uniarticulate. Maxillae with 

 the inner lobe normal ; outer lobe narrow linear. Maxillipeds of the usual 

 structure; the posterior ones in male without any distinct palmar projection. 

 Natatory legs strongly built, though not very different in structure from those in 

 the preceding genera. Last pair of legs with the proximal joint well defined 

 from the segment; distal joint lamelliform and provided with lateral spines in 

 addition to the apical setae. 



Remarks. This genus is also closely allied to Ascomyzon, though at once 

 distinguished by the tail having one segment more in both sexes. The genus 

 Cyclopicera of Brady, though of earlier date than Dermatomyzon, cannot properly 

 be retained, because it was originally (in 1872) based upon a species that has 

 turned out to be a true Ascomyzon (A. latum). Two species of the present genus 

 have been described ; but their specific difference has not been admitted by 

 Griesbrecht. 



56. Dermatomyzon nigripes (Brady). 



(PL LIX & LX). 



Cyplopicera nigripes, Brady, Moiiogr. of British Copepoda, Vol. Ill, p. 54, PI. LXXXIX, figs. 1 11. 



Syn : Ascomyzon Thorelli, G. 0. Sars. 



Specific Characters. Female. Anterior division of body rather tumid, 

 broadly oval in outline, with the cephalic segment very large and evenly arched 

 in front; lateral edges of this and the succeeding segment inflexed. Rostrum 

 triangular, but not very prominent. Lateral parts of the trunk-segments obtusely 

 rounded at the end. Tail nearly half the length of the anterior division and having 

 the segments very sharply marked off from each other, each segment being produced 

 at the end on each side to an acute corner; genital segment moderately broad and 

 imperfectly subdivided in the middle, with the lateral edges perfectly smooth; 

 anal segment smaller than the preceding one. Caudal rami comparatively short, 



