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4.S 



ART. 8. ON BOECKELLA AND PSEUDOBOECKELLA — MAEJl'-H. 19 



KEY TO SPECIES OF PSEUDOBOECKELLA MRAZEK. 



The terminal segments of the exopodites of the fifth feet of the female have 3 

 spines 2 



The terminal segments of the exopodites of the fifth feet of the female have 5 spines. 



silvestri Daday. 

 The terminal segments of the exopodites of the fifth feet of the female have 6 



spines vallentlni Scott. 



The terminal segments of the exopodites of the fifth feet of the female have 7 



spines 5 



The left endopodite of the male fifth feet consists of 1 segment.braziliensis Lubbock- 



The left endopodite of the male fifth feet consists of 2 segments 3 



In the left fifth foot of the male the second segment of the exopodite has 2 spines 



on the external border dubia Daday. 



In the left fifth foot of the male the second segment of the exopodite has 1 spine 



on the external border 4 



The second segment of the left exopodite of the fifth feet of the male has a small 



spine on the internal side at the base of the hook setosa Daday. 



The second segment of the left exopodite of the fifth feet of the male does not have 



a small spine on the inner side at the base of the hook longicauda Daday. 



In the 3-segmented endopodite of the right male fifth foot the second and third 



segments are slender, the third segment is terminated with 2 spines; the left 



endopodite is 2 segmented brevicaudata Mrazek. 



In the S-segmented endopodite of the right male fifth foot the second and third 



segments are not especially slender and the third is armed with 4 stout spines; 



the left endopodite is 2 segmented poppei Mrazek. 



PSEUDOBOECKELLA BRAZILIENSIS Lubbock. 



1854. Diaptomus braziliensis Lubbock, pp. 236-240, pi. 15, figs. 3-8. 



1889. Boeckella braziliensis DeGuerne and Richard, pp. 100-102, figs. 54-56 



(from Lubbock). 

 1901. Psuedoboeckella braziliensis Mrazek, pp. 5-6, pi. 1, figs. 11 and 13; pi. 2, 



figs. 24 and 30. 

 19056. PseudoboecJcella braziliensis Ekman, p. 600. 

 N'ot Pseudoboeckella braziliensis Poppe and Mrazek, nor Daday. 



Female. — The first antennae extend to the hist cephalothoracic 

 segment. The sides of the last cephalothoracic segment extend 

 back nearly to the second abdominal segment; they do not have 

 inner lobes and their inner margins are nearly straight. The terminal 

 segments of the exopodites of the fifth feet have 3 spines. 



Male. — In the fifth feet the hook in both exopodites bears a small 

 spine on the inner side; in the right foot the spine is situated at about 

 one-third the length of the hook and in the left at about one-half. 

 In the right endopodite the three segments are approximately equal 

 in length and the whole endopodite equals the first 2 segments of the 

 exopodite. The left endopodite is short and composed of 1 segment. 

 Figure 27 shows the fifth feet of the male. 



Length. — Male, 1.6 mm,; female, 2 mm. 



Patagonia; Tierra del Fuego. 



