456 BULLETIN" 15 8, UNITED STATES NATION" AL MUSEUM 



second and third segments the same length, fourth segment one-half 

 longer, all three segments "with dorsal plates similar to those in the 

 female. Fused fifth and genital segment a little longer and con- 

 siderably narro-wer than the free thorax, tapered back-wards. Ab- 

 domen 3-segmented, the segments diminishing posteriorly; caudal 

 rami longer than the anal segment, t"welve times as long as "wide, 

 each tipped "with three small setae and fringed with cilia on the 

 inner margin. 



Segmentation of first antenna very indistinct; second antenna, 

 mouth parts and swimming legs like those of the female. The sec- 

 ond endopod segment in all four pairs of legs is armed on its ven- 

 tral surface near the outer margin with a row of small papillae, like 

 those of the female. Total length, 4.5-5 mm. Carapace and free 

 thorax combined, 2 mm. 



Remarks. — This species can be recognized at once by the curious 

 papillae on the ventral surface of the second endopod segments. In 

 the female also the body is exceptionally long and narrow. 



KR0TERIA LINEATA Beneden 



Plate 30, j-m 

 Kr0yeria Uneata BENEDEisr, Bull. Akad. Roy. Belgique, vol. 20, p. 20, pi. 1, 1853. 



Occurrence. — Found on the gills of the hammerhead shark, 

 Sphyma Bygaena, captured in the fish nets on Marthas Vineyard. 



Color. — Body yellowish white, darker and more or less brownish 

 in the thicker parts of the cephalothorax and abdomen; Q,gg strings 

 dark brown. 



Female. — Carapace as long as wide; cephalic area oblong, the 

 frontal margin projecting; lateral areas with a projecting anterior 

 corner and short posterior lobes ; stylif orm processes extending to the 

 middle of the third segment and straight (Beneden) or sometimes to 

 the middle of the fourth segment and curved inward at their tip 

 (Claus). Second segment short, third and fourth segments each a 

 little longer, the third about one-third the width of the carapace. 

 Fused fifth and genital segment wider than the free thorax and eleven 

 times as long as wide. Abdomen composed of a single segment, the 

 same width throughout, two-fifths as wide as the genital segment and 

 four and a half times as long as wide. Caudal rami nearly half the 

 length of the abdomen, four times as long as wide, each tipped with 

 three long plumose setae. First exopod without outer spines, first and 

 second segments with an inner seta, third segment with five setae; 

 first and second endopod segments with inside seta, terminal segment 

 with three setae. Total length, 7-8 mm. 



