40 PEOCEEDINGS OF THE NATIONAL MUSEUM vol. 82 



has four segments : the third segment has spines on its distal border, 

 but there are more on the other segments. The furcal rami are 

 short. The terminal hook of the exopod of the fifth foot (pi. 20, 

 fig, 4) is only slightly curved ; in addition to the hook the terminal 

 segment has a small external spine, a stout spine at the inner base 

 of the hook, and an internal spine broadened by a dentate hyaline 

 lamella. 



Length, 1.25 mm. 



Male. — There are endopods on both fifth feet. (PI. 20, fig. 5.) 

 The endopod of the right foot is bifid, one branch terminating in a 

 spine and the other having short hairs. The first segment of the 

 exopod has hairs on the inner distal margin and a long slender 

 spine on the outer margin. The lateral spine of the second segment 

 of the exopod is at the distal end. The terminal hook is serrate on 

 the inner margin and in addition to the small spine on the inner 

 margin of the base, has a curved spine on the outer margin. The 

 endopod of the left foot is 1-segmented, slender, and extends about 

 one-half the length of the second segment of the exopod. The first 

 segment of the exopod is slightly longer than wide and has a long 

 slender spine at the outer distal angle. The second segment of the 

 exopod is expanded, the outer margin a regular curve, the inner 

 sinuate, ending in a point directed inward. There are two external 

 spines on this segment and one internal situated near the distal end. 



Length, 1.25 mm. 



OcGwrreince. — Found in Ked Sea, Gulf of Suez, and Indian Ocean. 



PSEUDODIAPTOMUS STUHLMANNI (Poppe and Mrazek) 



Plate 20, Figures 6, 7 



Schmackeria stuhlmanni Poppe and MrAzek, 1895, pp. 6, 7, pi. 1, figs. 1-9. 

 Pseudodiaptomus stuhlmanm Giesbkecht and Schmeil, 1898, pp. 65, 66, fig. 16. 



Female. — The head is narrowly rounded. The wings of the last 

 thoracic segment are pointed. The abdomen has four segments; 

 there are spines on the distal borders of the first three segments. 

 The furcal rami are rather short. The first antennae have 21 seg- 

 ments and do not reach the end of the first abdominal segment. In 

 the fifth foot (pi. 20, fig. 6) the second segment of the basipod has 

 a rounded projection on its inner margin; the second segment of the 

 exopod has a small external spine, a rather short hook with a spine 

 branching from its base and an internal spine, which has a narrow 

 hyaline lamella. 



Length, 1.4 mm. 



Male. — On the inner margin of the first segment of the basipod 

 of the right fifth foot (pi. 20, fig. 7) is a stout claw projecting 

 inward ; from this segment, too, is a slender spatulate endopod, which 



