218_ 



Body whitish, with a slight yellow tinge. 



Length of adult female 0.44 mm. 



Remarks. In the slender form of the anterior antennse and in the struc- 

 ture of the 1st and last pairs of legs, this species seems ta agree exactly with 

 the form described by Th. Scott under the above name. The size of the Nor- 

 wegian specimens is however much inferior to that recorded by Th. Scott (0.67 

 mm.), and for this reason the identity of these 2 forms may perhaps appear some- 

 what doubtful. 



Occurrence. I. have met with this small species not unfrequently in 

 several places both off the south and west coasts of Norway in moderate depths 

 among algse. 



Distribution. Scottish coast (Scott). 



139. Ameira tau (Giesbrecht). 



(PI. CXLITI). 

 Nitocra tau, Giesbrecht, Die freilebenden Copepoden des Kieler Fohrde, p. 117, PL I, figs 9, 13 &c. 



Specific Characters. Female. Body rather slender, sublinear in form, with 

 the cephalic segment less deep than in the preceding species. Last caudal seg- 

 ment shorter than the preceding one. Caudal rami about as long as they are 

 broad and transversely truncated at the tip, apical setae of moderate length. 

 Anterior antennse shorter than the cephalic segment, and having the 2 basal joints 

 rather dilated, terminal part not attaining half the length of the proximal one. 

 Mandibular palp with a single thickish seta inside the basal joint. 1st pair of 

 legs with the outer ramus about half the length of the inner, terminal joint of 

 the latter very slender, linear in form, being about 3 times as long as the 2nd, 

 both together nearly as long as the 1st. Last pair of legs resembling those in 

 A. tenuicornis, but with the distal joint comparatively smaller. 



Colour whitish. 



Length of adult female 0.50 mm. 



Remarks. The above-described form is unquestionably that recorded by 

 Dr. Giesbrecht as Nitocra tau. It is however a true Ameira, exhibiting, as it 

 does, all the essential characters of that genus. From the 3 preceding species it 

 is especially distinguished by the structure of the inner ramus of the 1st pair 

 of legs. 



Occurrence. I have met with this form occasionally both of the south 

 and west coasts of Norway, as also in the Trondhjem Fjord. It is a strictly 



