682 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 47. 



the frontal margin, their tips just touching on the midhne, their pos- 

 terior margins in contact with the anterior ends of the maxiUipeds. 

 These terminal joints are also strengthened by stout chitin ribs, and 

 their bluntly rounded tips are roughened by short spines. ^louth 

 tube very short and narrow, actually withdrawn behind the ends of 

 the maxiUipeds; mandibles with a slender neck, a widened blade, and 

 five or six large, sharply pointed and curved teeth; first maxillae 

 short and slender, bipartite, the palp extremely rudimentary. 



Second maxillae short, thoroughly fused, and furnished with a 

 medium-sized spherical bulla; maxiUipeds pushed forward until they 

 completely overlap the mouth tube, first antennae and maxiUae. 

 They are rather small with a stout basal joint and a slender, curved 

 terminal claw, which is twisted so that it shuts down on the dorsal 

 surface of the basal joint, and is whoUy invisible in ventral view. 



Color, a uniform orange yellowy, lighter in living specimens, much 

 deepened and darkened on preservation in alcohol, especially the 

 chitin framew^ork of the second antennae. 



Specific cJiaracters of male. — General body form ovoid, the head at 

 the pointed end; cephalothorax folded ventrally against the trunk 

 and the two indistinguishably fused, with no recognition of parts, 

 no segmentation, no anal laminae, and no dorsal carapace. 



First antennae two-jointed and tipped with two minute setae; 

 second antennae with a long, three-jointed exopod, tipped with two 

 or three short setae, and a rudimentary endopod, unarmed; mouth 

 tube large and long, conical, projecting its entire length in front of 

 the thorax; mandibles simUar to those of the female; first maxiUae 

 narrow and slender, bipartite, ending in two long acuminate setae, 

 the palp with a single seta; second maxiUae long and narrow, pro- 

 jecting some distance beyond the maxilhpeds, and armed with a 

 short and slender claw; maxiUipeds with a stout, triangular basal 

 joint and a short and stout claw; the surface of the basal joint on 

 the inner surface is raised up in a semichcular ridge, which forms a 

 sheath, into which the tip of the claw fits when it is closed; between 

 the maxilhpeds on the median line is a short rounded process, simUar 

 to that noted by van Beneden in the male of BracMella, and by Kane 

 in the male of Lernaeopoda. 



Color, a uniform yeUowish-white. 



Total length, 0.5 mm. Greatest width, 0.32 mm. 



(uncinata, fuirnished with claws, aUuding to the maxiUipeds w^hich 

 had not been found on other Lernaeans). 



Copepodid larva. — A single finely preserved specimen was found 

 among a lot of adult males and females taken from the gUls of a 

 flounder. General body form simUar to that of Cyclops; carapace a 

 fusion of the first thorax segment with the head, ovate in shape, 

 three-fifths of the entire length, with the anterior and posterior mar- 



