Entomostraca from the Arctic Seas. 341 
Fam. Cyclopide. 
* Oithona helgolandica, Claus. 
The species we record under this name appears to be 
identical with that from the British seas, which, according 
to Sars, has been wrongly described as O. spinifrons of 
Boeck, but which is equal to the O. pygmea of the same 
author. He shows further that Boeck’s O. pygmea is iden- 
tical with O. helgolandica, Claus ; and as Claus’s name is the 
older it takes precedence of the other. O. helyolandica was 
observed in several gatherings ; it was obtained in two from 
the vicinity of Kolguev collected in June, and in others 
collected between Bear and Hope Islands, and in Kval 
Sound in July. 
Cyclopina gracilis, Claus. 
This small but distinct species was obtained in some 
dredged material from two places, viz. from moderately 
shallow water near Kolguev Island in June, and in July in 
material from 100 to 110 fathoms to the east of Hope Island. 
Only one or two specimens were observed. ‘This species 
has also been taken by Mr. Bruce near Cape Flora, Franz- 
Josef Land fT. 
Thorellia brunnea, Boeck. 
Thorellia was obtained sparingly amongst some material 
dredged in 20 fathoms between the Island of Kolguev and 
the south-west end of Novaya Zemlya on the 16th of June. 
It has also been recorded from near Elmwood, Franz-Josef 
Land ¢. The species is also frequent in the British seas. 
Cyclops (?) bisetosus, Rehberg. 
The small Cyclops which we ascribe to C. bisetosus agrees 
with that species in having comparatively short 17-jointed 
antennules, and in the end joints of the fitth pair of thoracic 
feet being narrow-cylindrical, and having the short terminal 
bristle setiform rather than minute and tooth-like as in 
C. vernalis. The receptaculum seminis also closely resem- 
bles that of C. bisetosus. But, on the other hand, our 
specimens have the lateral extremities of the fifth segment 
* Sars, op. cit. p. 119, removes Orthona from the fam. Cyclopide to a 
new family—the Oithonidee. 
+ T. Scott, “On the Crustacea of Franz-Josef Land,” Journ. Linn. 
Soe. (Zool.) vol. xxvii. no. 174 (July 1899), p. 93. 
t T. Scott, op. cit. p, 93. 
