﻿COl'El'ODA 



15 



are found. The arrangement of hairs on the labial lobes and the somites behind seems, as far as made 

 out, to be like that of Cnl. Jiyprrburcus. In several specimens it was seen tliat the transverse line, which 

 limits the maxillar somite posteriorly, is continued jnst in front of the articular cavity of the maxilli- 

 pes and laterally into the membrane, dorsally and posteriori}- limiting;- the head. Accordinjj^ly the 

 first, thoracic somite bear two pair of limbs viz. maxillipeds and pes I, and thus corresponds to two 

 somites (cf. Hansen 1893). 



Bv examining females from Denmark I did not find any difference from those described except 

 in the arrangement of the hairs of the ventral surface of the maxillar and maxillnlar somite, which 

 is less complex than those figured. 



The only difference between nudes and fenuiles seems to be the more prominent median 

 process of the labrnm in the former sex. 



Textfigure i. 



Calanus finmarchkus G. Q. Labial lobe seen from 



in front with lamina labialis and serrula 6flen- 



tata etc. X c. 170. 



Textfigure 2. 



C. finmarchicus G. ?. (Stage IV- V). 



a. Pes V sill, (stage V) in anterior view X 85. 



b. Pes IV sin. (stage IV) in autenor view X 85. 



c. Pes V sin. (stage IV) in anterior view X S5. 



Y. (St. V). vSize: Varying from 2-2 (Egede.sminde, Davis vStraitI, 2-5 (73' ^'- N. S' \,. K.) — 4-8 

 mm. (Davis Strait). Gran's specimens (-^- urosome) varied from 2-i — 2-6 and the specimens from due 

 d'Orleans 3 — 4-5 mm. 



This stage, in which I have not been able to distinguish males and females, is easily disting- 

 uished by 4 abdominal .somites of which the second is the longest, 27 as long as the first and 1-4 

 as long as the anal somite. The month-appendages are scarcely different except the maxillulae, 

 which have only 10 instead of 11 setae in the e.xopodite. The four pair of natatory legs are scarcely 

 different from those of the nurture feuude, Init pes V differs by fu.sed Ri II -III without indication of 

 Sell but with the number of Si 7 as usual, and by the fu.sed Re II III with 5 Si and well 

 developed Se Re II (textfig. 2 a). Nuudjer of secretory pores .seem to be alike f? in pes II — III, but 



