246 



BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM 



from the sand of Buzzards Bay bathing beach at Woods Hole, July, 

 1927; washed also from the sand of Nobska bathing beach, and 

 from sand on the shore of Katama Bay, Marthas Vineyard. 



Distribution. — Scottish tide pools (T. Scott) ; Kiel Bay (Gies- 

 brecht) ; coast of Norway (Sars) ; Adriatic (Pesta). 



Color. — Body transparent with a whitish tinge, becoming snow 

 white and opaque in formalin; eggs gray or grayish white; eye not 

 visible. 



Female. — Cephalic segment short and broadly rounded anteriorly; 

 anal segment not more than half the length of the penultimate seg- 

 ment; caudal rami wider than long, 

 somewhat obliquely truncated at the 

 tips. Two basal segments of first an- 

 tennae enlarged, but together only half 

 as long as the rest of the appendage; 

 basal segment of second antenna dis- 

 tinctly divided, the exopod attached 

 at the joint; distal segment of first 

 endopod three times as long as second 

 segment and half as long as the basal 

 segment ; middle segment of first exo- 

 pod without an inner seta; distal seg- 

 ment of fifth legs strongly contracted 

 at its base, broadly rounded at its tip, 

 with five setae, the second inner one 

 filiform and greatly elongated; basal 

 expansion reaching beyond the center 

 of the distal segment, with four setae, 

 the two outer ones sparsely plumose, 

 the two inner ones with tufts of cilia 

 at their tips, the second outer one 

 the longest. Total length, 0.45-0.55 

 mm. 

 Male.—F'w^t antennae 9-segmented, the fourth, fifth, and sixth 

 segments moderately swollen and more or less fused, aesthetask 

 reaching little beyond the tip of the end segment. Endopod of first 

 legs much longer than exopod, its two distal segments about equal 

 in length and together about half the length of the basal segment; 

 middle segment of first exopod with an inner seta. Fifth legs much 

 reduced in size, the distal segment oval, one-half longer than wide, 

 with three setae, of which two are apical and one outer ; basal expan- 

 sion nearly reaching the center of the distal segment, with two very 

 unequal setae. Total length, 0.4^0.5 mm. 



FiGUUE 1G3. — Ameira tau: a, Fe- 

 male, dorsal (after Sars) ; J), 

 female, fifth leg ; c, male, fifth 

 leg 



