384 PROCEEDINGS OF THE NATIONAL MVSEVM. vol. xxxin. 



combined length not more than one-third the width of the carapace. 

 Posterior margin almost straight and with a triangular flap on either 

 side projecting backward over the lateral plates of the second thorax 

 joint. Lateral areas wider than in ferox and -producta and without 

 any visible transverse grooves; posterior lobes wide, broadly rounded, 

 and extending backward toward and somewhat overlapping the dor- 

 sal plates of the fourth segment. Thoracic area almost rectangular, 

 more than half the entire width of the carapace and about half the 

 length on the mid-line; cephalic area small and elliptical. 



Second thorax joint much shorter than the third, but wider, and 

 furnished with a pair of good-sized lateral plates, which fill the entire 

 space between the posterior lobes of the carapace. Third joint wedge- 

 shaped and without dorsal plates; fourth joint with a pair of large 

 ones which extend out laterally nearly to the margin of the carapace 

 and posteriorly over the basal third of the genital segment. These 

 two plates are fused anteriorly, the narrow median sinus not reaching 

 quite to their base; each is somewhat triangular in shape, the anterior, 

 lateral, and inner margins being convex, while the posterior margin 

 is slightly concave. Each plate has the same width and length, thus 

 difi^ering radically from those of the other two species already described. 

 The fourth segment is much narrower than the third, and the base of 

 the dorsal plates is contracted to about half the width of the third 

 segment. 



Genital segment elongate, nearly twice the length of the carapace 

 on the midline, with wide and evenly rounded lobes at its posterior 

 corners. Its dorsal plates are considerably narrower and shorter than 

 the segment itself; their posterior ends are broadly rounded and sepa- 

 rated by a triangular sinus whose sides are much more divergent 

 than m ferox or producta. 



Dorsal process of the sixth segment club-shaped or spatulate, and 

 prolonged backward over the abdomen and the base of the anal lami- 

 nae. Its two small dorsal plates are separated by a narrow median 

 sinus; they do not reach the tip of the process and do not extend 

 beyond its lateral margins, except at the base. Abdomen broad, 

 heart or kidney shaped, about twice as wide as long, and entirely 

 concealed in dorsal view. Its lateral margins are somewhat flattened, 

 while to its postero-lateral margins are attached the huge anal lami- 

 nae, each fully as large as the whole abdomen and tipped with four 

 long plumose set«. Egg strings slender and about twice as long as the 

 body of the copepod. 



On the ventral surface of the carapace there are four adhesion pads 

 on either side of the body and a single median one just behind the 

 bases of the first swimming legs. These are similar to the pads found 

 in Pandarus, and characterize the present genus as one of the Panda- 

 rinse, The first two pairs of these pads lie posterior to the bases of 



