32 U.S. NATIONAL MUSEUM BULLETIN 236 



C. steueri appears to be very closely allied to C. rotundipes Herbst, 

 1952; both species, after the study of more material, may prove to be 

 identical. A single specimen of C. steueri occmTed in a sand sample 

 taken some 340 feet from the reef maigin at Falarik, Ifaluk Atoll. 



Cyclopina brachystylis G. O. Sars, 1921 



Figures 5-7 



Cyclopina brachystylis Sars, 1921, p. 103, pi. 69 (fig. 2).— Friichtl, 1924, p. 85.— 

 Pesta, 1927, p. 38.— Kief er, 1929, p. 18.— Smirnov, 1935, p. 207, figs. 6, 7.— 

 Schafer, 1936, pp. 230, 234, figs. 18, 19.— NichoUs, 1939, p. 308.— Steuer, 

 1940a, p. 8.— Lang, 1946, p. 13.— Sewell, 1949, pp. 22, 23, 162, 164, 165, 

 190, 191.— Lindberg, 1953, pp. 319, 323. 



Material. — Loc. 589, 1 ad. 9, 0.42 mm.; 1 9cop. stage V, 0.42 mm.; 

 1 juv., 0.23 mm. 



Description. — The following is based on the adult female specimen, 

 which has been figured and dissected; the appendages have been 

 mounted on sUdes. 



Adult female, total length 0.42 mm. Proportional length of 

 cephalothorax and abdomen is 17:11; greatest diameter 0.15 mm. 



General shape of body cyclopoid: cephalothorax well developed, 

 ovoid in dorsal aspect; abdomen distinctly set off from cephalothorax, 

 slender (figs. 5a,b). Cephalothorax in dorsal view rounded anteriorly 

 and posteriorly. Head and 1st thoracic somite fused to form cephalic 

 somite, which occupies considerable part of cephalothorax; greatest 

 diameter of cephalothorax at end of cephalic somite. Cephalothorax 

 narrows gradually anteriorly, sHghtly constricted in oral region and 

 very distinctly contricted at insertion of antennules. Base of rostrum 

 visible between basal parts of antennules; rostrum itself not visible 

 from above. Back, in lateral aspect, almost straight; head smoothly 

 rounded into rostrum, which forms triangular mass with rather broad 

 base, apex pointing downward and obtuse. No indication of line of 

 fusion between head and 1st thoracic somite, neither dorsally nor 

 laterally. Thoracic somites 2 and 3 of about same length ; 4th thoracic 

 somite small, especially in dorsal aspect; dorsally and laterally it is 

 broadly rounded. The parts of the cephalothorax have the following- 

 proportional lengths: 



head+1 2 3 4 

 66 13 15 6=100 



5th thoracic somite small, in dorsal aspect with small but distinct 

 laterally produced wings, running into a small, laterocaudal point. 

 Genital somite composed of abdominal somites 1 and 2, no line of 

 fusion visible, long and slender. In dorsal aspect genital somite 

 appears to have lateral swelUng in the proximal third (fig. 6o). Ab- 

 dominal somites 3 and 4 of nearly same length; anal (5th abdominal) 



