COPEPODA FROM IFALUK ATOLL 31 



19. Terminal segment of leg 5 elongate, about twice as long as broad .... 20 

 Terminal segment of leg 5 ovate or circular, as long as broad or V/2 times 



as long as broad 21 



20. Big species, about 0.5 mm. total length; sacs with many eggs. 



C. norvegica Boeck 

 Small species, total length about 0.3 mm; sacs with 3-5 eggs. 



C. hadzii Petkovski 



21. Antennules short, reaching about Ys the length of the cephalothorax. 



C. rotundipes Herbst 



Antennules slightly longer, reaching the line of fusion between head and 1st 



thoracic somite. (Denticulate lamella at the ventral ends of the genital 



somite, the 3rd abdominal somite, and the furca.) . . C. steueri Friichtl 



Cyclopina steueri Friichtl, 1923 



Figures Id-/ 



Cyclopina steueri Fruchtl, 1923, pp. 450, 453; 1924, pp. 74, 86, figs. 49-58.— 

 Kiefer, 1929, p. 17.— Gurney, 1933, p. 16.— Schafer, 1936, p. 234.— Steuer, 

 1940a, p. 8.— SeweU, 1949, pp. 22, 23, 162, 176, 185.— Lindberg, 1953, 

 pp. 319, 324.— Herbst, 1955, p. 220, figs. 31e-m. 



Material.' — ^Loc. 592, 1 ad. 9, 0.34 mm. 



Notes. — Rostrum not visible from above. Frontal part of head in 

 dorsal aspect broadly rounded; in lateral aspect frontal part very- 

 obtuse. Rostrum strongly curved, pointing downwards, bluntly 

 pointed. The number of spines on the 3rd exopodal segment of legs 

 lto4is4.4.4.3; thenumber of setae,4.5.5.5. Leg 5 (fig. 1/) 2-segmented, 

 the basal segment well developed, with a long external seta; apical 

 segment ovate, internal and external spine of about the same length 

 and as long as the apical segment; median seta twice as long as 

 terminal segment, plumose. External margin of terminal segment 

 with spiniform hairs. 



Cyclopina steueri is based on a single female specimen, 0.41 mm. 

 long, captured in a surface plankton haul at the eastern exit of Sungi 

 Manumbai in the Aru Archipelago (type locality). A female speci- 

 men, 0.4 mm. long, from the sandy beach of Inhabela on the Atlantic 

 coast of Brazil, was referred doubtfully to Friichtl's species by Herbst 

 (1955). The present specimen, in addition to being sHghtly smaller, 

 agrees fairly well with Friichtl's detailed description except for the 

 following two points: 



1. Denticulated lamella along ventral part of distal margins of 

 genital somite, 3rd abdominal somite and furca very imperfectly de- 

 veloped and almost invisible. Herbst also failed to observe the 

 above-mentioned denticulation in his specimen. 



2. The anal somite here appears to be sHghtly longer; it is as long 

 as the preceding (4th abdominal) somite and only slightly shorter 

 than the f ureal rami. 



