36 "Cr.S. NATIONAL MUSEUM BULLETIN 23 6 



The various details of legs 1-4 can best be taken from figures 7a-d as 

 well as from the following formula (arable numerals represent setae; 

 roman, spines): 



Leg 5 (fig. 6a) 2-segmented; basal segment small, with a single 

 external seta. Terminal segment twice as long as basal segment, 

 3 times as long as wide. External spine large, with distinct hyaline 

 lamella; internal spine slightly more than haK as long as external 

 spine, lamella indistinct. Median seta short and nude, basis thick- 

 ened. Internal margin of terminal segment with some dispersed, 

 spiuiform hairs. 



Color faded, transparently white. 



Remarks. — The identification is based mainly on the segmentation 

 of the antennule, the setal and spinal armature of the legs, the shape 

 and armature of leg 5, and the structure and length of the furca. 



Cyclopina brachystylis was originally described from female speci- 

 mens from the Norwegian south and west coast, including the 

 Trondheim Fjord, by G. O. Sars (1921); no exact type locality can 

 be given. The females in Sars' material measured 0.56 mm. The 

 species was not described completely; in addition to a drawing of the 

 whole animal, only details of the antennules, the 5th leg, and the 

 furca are illustrated. No particulars of the oral appendages or the 

 legs are given. The species was mentioned afterwards by Schafer 

 (1936) from the Helgoland area of Germany, between algae in 5-8 

 m. depth, Sars' specimens were all from moderate depth, varying 

 between 10 and 50 fathoms; the species never occurred in the littoral 

 zone. Though no complete description of the female has been pub- 

 lished by Schafer, it seems very likely, due to the proximity of the 

 localities, that he really studied Sars' form. Schafer also includes 

 a few notes on the male; his specimens measured 0.49 mm. (9) 

 and 0.38 mm. (cf), Smirnov (1935) records both sexes from 

 the Vladivostok area, the only Pacific record so far known. His 

 specimens measured 0.49-0.52 mm. He also includes some particu- 

 lars of the male in his description, but as the structure of leg 5 of his 

 male specimen differs widely from that of Schafer's male specimens, 

 the whole record seems rather doubtful. A complete redescription 

 of Norwegian specimens of Cyclopina brachystylis, including particulars 

 of mouth parts and legs, is highly desirable. 



