626 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 39. 



two-jointed in the female, the basal joint with large lateral lobes; 

 indistinctly jointed and without lobes in the male. Maxillary hooks 

 and f urea present; first three pairs of legs biramose; endopod of first 

 pair rudimentary; both rami of third pair distinctly three-jointed. 

 Egg-cases like those of the Caliginse. 

 Type-species. — 31. lohodes, new species. 



MIDIAS LOBODES.a new species. 



Female. — General body form elongate and strongly flattened; cara- 

 pace elliptical, the margin very evenly rounded, almost as wide as 

 long and two-fifths of the entire length. Frontal plates not well 

 differentiated, with a shallow median sinus; lunules small and 

 widely separated, semicircular and projecting but little; posterior 

 sinuses oval and shallow, lateral lobes curved inward at the tip; 

 median lobe a little more than one-third the entire width and- not 

 reaching to the ends of the lateral lobes; thoracic area very small, 

 transversely elliptical, one-half wider than long, and covering only 

 the posterior third of the central portion of the carapace. 



Free segment half the width of the genital segment, considerably 

 enlarged through the bases of the fourth legs, and bearing a pair of 

 rudimentary dorsal plates, which are slightly elevated and distinctly 

 visible in the living female but flattefi down and are easily overlooked 

 in preserved specimens. 



Genital segment the shape of an inverted U, squarely truncated 

 posteriorly and two-thirds the size of the carapace, with a pair of 

 legs plainly descernible at the posterior corners. 



Abdomen nearly as long as the genital segment and two-jointed, 

 with a large semielliptical lobe on either margin of the basal joint. 

 These lobes are as long as the segment to which they are attached 

 and extend outward to the level of the lateral margin of the genital 

 segment. Posteriorly the abdomen is produced into a long cylin- 

 drical lobe on either side of the anal laminae. The latter are situated 

 on the squarely truncated posterior margin of the abdomen, are 

 about the same size as the posterior lobes, and are each armed with 

 four terminal spines. 



The egg-cases are twice the width of the anal laminae and a little 

 longer than the entire body; the eggs are small and numerous, about 

 100 in each case. 



Maxillary hooks of medium size, with a basal portion fi.ve times 

 the width of the nearly straight terminal portion. 



Mouth-tube short and semicircular in outline ; first maxillae stout, 

 not quite reaching the tip of the mouth-tube, and furnished with an 

 accessory tooth or spine on the inner margin near the center. Ter- 



« Lobodes, Xo^chdijg, {XoP6c+e}doc), like a pea-pod, lobed, alluding to the large lobea 

 on the sides of the basal joint of the abdomen in the female. 



