ART. 8. 



ON BOECKELLA AND PSEUDOBOECKELLA MARSH. 



end is round and tapering. On the second basal segment of the left 

 foot is a rectangular lamella which is serrate on its distal margin. 

 The left endopodite is 2 segmented and about two-thirds the length 

 of the first segment of the exopodite; the inner margin of the first 

 segment of the exopodite is sparsely ciliate. Figure 4 shows the 

 fifth foot of the male. 



Length,. — Female, 1.8 mm.; male, 1.7 mm. 



New South Wales. 



BOECKELLA GRACILIPES Daday. 



1901. Boeckella gradlipes Daday, pp. 348, 349. 



1902. PseudoboecJcella gradlipes Daday, pp. 224-227, pi. 5, figs. 1-7. 



1905. Boeckella gradlipes Ekman, p. 603. 



1906. Boeckella gradlipes Marsh, p. 183, pi. 17, figs. 6 and 7. 



Figs. 5-7.-5, Boeckella gracilipes Daday, fifth feet of male, X 165. 6, B. gracilipes Daday 



FIFTH FOOT OF FEMALE, X 165. 7, B. GRACILIS DADAY, FIFTH FEET OF MALE, AFTER DADAY. 



Female. — The first antennae extend to the end of the furca. The 

 last thoracic segment projects only slightly, the sides not distinctly 

 divided. The terminal segments of the exopodites of the fifth feet are 

 armed with 3 spines. 



Male. — In the fifth feet the right endopodite consists of 2 segments 

 and equals in length the first segment of the exopodite. The left 

 endopodite is of one segment and is minute. Figure 5 shows the fifth 

 feet of the male, and Figure 6 the fifth feet of the female. 



Length according to Daday. — Male, 0.8 mm.; female, 0.8 to 1.1 mm. 



Length according to Marsh. — Male, 1.28 mm.; female, 1.485 mm. 



Argentina; Lake Titicaca. 



