144 PROCEEDINGS OF THE NATIONAL MUSEUM vol. us 



base of mouth cone and posterior to mandible base, consisting of 

 1-segmented, knoblike protopodite and 1 -segmented endopodite and 

 exopodite, each ramus with minute, hairlike processes. Maxillae 

 (?) (fig. 39e) 2-segmented, situated posterior to mouth cone base, 

 first segment strongly developed, second and terminal process claw- 

 shaped, with single, spikelike accessory process. Maxillipeds (?) (fig. 

 39/) attached to lobe lateral and posterior to maxillae, consisting of 



2 indistinctly separated segments, second tipped by 2 minute, clawlike 

 processes. 



Diagnostic description of male. — Attached to posterior medial 

 surface of female. Body (fig. 40a) of copepodid shape, separable 

 into 2 regions although external indication of body segmentation faint. 

 Anterior region (cephalothorax) composed of cephalon and maxilliped- 

 bearing segment according to Wilson's terminology (1919). Posterior 

 region (urosome) consisting of 5 indistinctly separable segments, 

 separated from cephalothorax by incomplete division and by size. 

 Diameter of urosome less than that of cephalothorax. Posterior 

 region with 2 pairs of small, lobate processes on fourth segment and 

 pair of somewhat longer caudal rami (fig. 40h) on last segment. 



Cephalothorax of general ovoid shape in lateral view, anteroventral 

 surface depressed giving impression that dorsal and lateral cuticle 

 form carapace-like covering. Antennule (fig. 406) 2-segmented, sit- 

 uated on anterolateral cephalothoracic surface; second segment ap- 

 proximately three-fourths the length of first, not as well developed. 

 First segment with single setule on distal anterolateral surface, second 

 segment with single weak setule and 2 spikelike setules from distal 

 surface. Antenna (fig. 40c) situated posterior and slightly medial to 

 antennule, 4-segmented; first segment well developed, broader prox- 

 imally than distally, second segment with large lobate projection 

 anteriorly giving bifurcate appearance to appendage, projection with 



3 small, spikelike processes distally and with denticulated inner 

 margin. Third segment denticulated along posterior surface, fourth 

 segment short, with well-developed, clawlike spine, 2 simple spines 

 and denticulated knob, all on distal surface. Mandible (fig. 40d) rod- 

 like, composed of at least 3 parts; proximal part broad, tapered 

 distally, second and third parts also tapered, thu'd with denticulated 

 inner margin distally. Mouth cone (fig. 40a) short, arising from de- 

 pression in anterior ventral cephalothoracic surface, distal end fringed 

 with plumosities. Maxillule (?) (fig. 40e) arising from ventral cephalo- 

 thoracic surface posterior to mandible and adjacent to mouth cone, 

 composed of 2 subequal segments, first overlapping second distally, 

 with flimsy, conical process on distal outer surface; second segment 

 with 3 flimsy, conical processes on distal outer and distal surfaces, 

 all processes indistinctly separable from segments. Maxilla (?) (fig. 



