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BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM 



male 5-segmented ; caudal rami divergent and elongate, with apical 

 setae of moderate length and a small seta near the center of the 

 outer margin. Two ovisacs, somewhat divergent. First antennae 

 5-segmented, exopod of second antennae 7-segmented; first four 

 pairs of legs with 3-segmented rami; fifth pair rudimentary, con- 

 sisting of a narrow plate armed with setae. One species found here. 



CANUELLA FURCIGERA G. O. Sars 



Figure 117 



Canuella furclgei-a Saks, Crustacea of Norway, vol. 5, p. 18, pi. 10, 1903. 



Occurrence. — A single female was taken in Oyster Pond, Fal- 

 mouth, July 20, 1926. 



Distribution. — Norwegian fiords (Sars). 



Color. — Body a uniform yellowish gray, the metasome with a few 

 interrupted transverse bands of deeper orange-yellow ; eye dark red. 



Female. — In addition to the generic 

 characters given above, the female shows 

 a distinct transverse groove across the 

 middle of the dorsal surface of the geni- 

 tal segment. On the ventral surface just 

 in front of this groove is a pair of small, 

 juxtaposed, triangular lappets. Caudal 

 rami as long as the three abdominal seg- 

 ments combined, each with a well-de- 

 fined longitudinal carina on its dorsal 

 surface ; middle apical seta twice as long 

 as the outer. Fifth legs narrow 4-lobed 

 laminae, scarcely projecting from the 

 surface of the fifth segment, each lobe 

 tipped with a single seta, the outer and 

 second inner ones longer than the others. 

 Total length, 1.25-1.4 mm. 

 Male. — Similar to the female but smaller; genital segment with- 

 out a transverse dorsal groove; the ventral lappets comparatively 

 much larger than in the female, even reaching beyond the posterior 

 margin of the genital segment, and fringed with setae. In the 

 triangular space between them are two secondary lappets close to- 

 gether and smaller, each ending in a short spine; fifth legs similar 

 to those of the female but smaller. Total length, 1.1-1.25 mm. 



Remarks. — The dorsal carina on each caudal ramus and the ven- 

 tral lappets on the genital segment are the most prominent charac- 

 ters. In the first legs of the female the setae on the two basal 

 endopod segments are not fastened to the inner margin, but to the 



Figure 117. — Canuella furcigera: 



a. Female, dorsal (after Sars) ; 



b, female, geuital segment, 

 lateral ; Oj female, flfth leg 



