90 



long; apical setae comparatively short. Anterior antennae not quite as long as 

 the cephalic segment, and composed of 20 articulations, all 3 joints of the ter- 

 minal part being well defined; proximal portion of the antennae rather thick and 

 very sharply marked oft' from the slender distal portion. Posterior antennae com- 

 paratively strong, with the penultimate joint somewhat shorter than the preceding 

 one. Oral cone not much produced, pyriform, extending scarcely beyond the 

 insertions of the posterior maxillipeds. Mandibles with the masticatory part 

 moderately prolonged and terminating in a lancet-shaped point; palp normal. 

 Maxillae with the inner lobe of moderate si/e and the apical setae comparatively 

 short; outer lobe scarcely more than 1 / 3 the length of the inner, and much narrower. 

 Maxillipeds of normal structure. Natatory legs well developed, with the rami 

 comparatively broader than in the preceding species. Last pair of legs with the 

 distal joint oval in form and cariying, in addition to the 2 apical setae, a small 

 bristle attached inside the latter. Ovisacs of moderate size and oval in form. 

 being only slightly divergent. 



Male differing from female in a manner similar to that in the other species. 



Body in both sexes rather pellucid, with a slight rosy tinge. 



Length of adult female about 1 mm , of male 0.72 mm. 



Remark*. This form was referred by Scott with some doubt to the genus 

 Axconii/zon. It is however certainly a genuine member of this genus, as defined 

 here, though well defined from the other species. 



Occurrence. I have long been aware of this form, of which several speci- 

 mens have been collected at different times off the south coast of Norway, and 

 always on Sponges, for which reason I had noted it with the provisional name 

 A. spongiopliilum. It also occurred in great numbers in the bottom-residue of 

 the same collecting-bottle from which A. Boecki was procured, and as this bottle 

 contained, besides other invertebrate animals, also a number of sponges, it is 

 most likely that they were in reality derived from the latter. 



Distribution. British Isles (Scott). 



53. Aseomyzon latum, (Brady). 



(PI. LVI). 

 Cijdopicera lata. Brady. Monograph of British Copepoda, Vol. III. p. 06. PI. LXXXIX. fig. 12, 



PI. XC. ti^s. 11 14. 

 Syu: Asterocheres Boecki, (liesbrecht 



Specific Characters. Female. Anterior division of body very broad and 

 expanded, the greatest width being almost equal to the length. Cephalic segment 

 large, with the frontal edge narrowly rounded. Epimeral parts of 2nd segment 



