218 BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM 



Distribution. — Helgoland (Claus) ; British Isles (T. Scott) ; Nor- 

 wegian coast (Sars) ; Finmark coast (T. Scott). 



Color. — Body light yellow, irregularly tinged with red, the diges- 

 tive tract usually dark brown ; eye bright red. 



Female. — Fifth metasome segment as wide as the fourth ; urosome 

 segments fringed posteriorly on the ventral and lateral surfaces with 

 spinules; caudal rami wider than long, the inner apical seta con- 

 spicuously swollen near its base, overlapping the outer seta. Exopod 

 of first leg as long as basal endopod segment ; end segment of third 

 exopod with four spines and four setae, one of the latter almost obso- 

 lete; distal segment of fifth legs oval, longer than wide, with six 

 setae, the two apical ones filiform; basal expansion reaching beyond 

 center of distal segment, with five subequal plumose setae. Total 

 length, 0.7-0.85 mm. 



Male. — Inner margin of second basipod of first legs armed with 

 three or four short, sharp spines, directed obliquely inward; distal 

 segment of second endopod with a short apical seta and two stout 

 outer spines, the proximal one widened ; the two proximal segments 

 of the second exopod each with two exceptionally stout spines, one 

 inside the base of the other; distal segment of fifth legs oval, with 

 six setae, the single apical one filiform; basal expansion conical, 

 with two equal setae. Total length, 0.65-0.75 mm. 



Remarks. — This species can be recognized by the long and sharply 

 pointed rostrum and the swollen base of the inner apical seta of the 

 caudal rami. It has not been reported before from our coasts, but it 

 is likely to be found in other ponds of the Woods Hole area besides 

 the one mentioned above. 



AMPHIASCUS ATTENUATUS Bars 



Figure 146 

 Amphiascus attcmialus Sae,s, Crustaceii oi: Norway, vol. 5, p. 171, pi. 112, 1906. 



Occurrence. — Fifty specimens, including both sexes, were found 

 in Penzance Pond, Woods Hole, August, 1925. 



Distribution. — West coast of Norway (Sars). 



Color. — Body semitransparent and whitish in color, banded with 

 pale brown as follows: First a chain of spots across the posterior 

 portion of the cephalic segment, consisting of a central H -shaped 

 mark, on each side of which is a semilunar disk inclined forward 

 and outward, and beyond it a circular dot; transverse bands across 

 the center of the second and third segments, near the posterior mar- 

 gin of the fourth segment, near the anterior margin of the genital 

 segment, and on the dividing grooves between the abdominal seg- 

 ments. Eye bright red. 



