CYCLOPOIDA. 



Gnathostoma. 

 Fam. Cyclopinidae. 



Gen. Cyclopina, Glaus. 



Remarks. On a careful examination of numerous specimens of Cyclo- 

 pina taken in many different places of our coast, I am led to the conclusion 

 that several nearly-allied species have hitherto been confounded, some of them 

 agreeing more closely with C. gracilis Glaus, some others with C. longicornis 

 Boeck. The supposed variability in the 2 said species of the caudal rami I 

 am now not prepared to admit. In all other known Copepoda these appen- 

 dages exhibit a perfectly constant appearance both as to form and relative 

 size, and indeed furnish one of the best and most reliable characters for 

 distinguishing nearly allied species. This I believe also applies to the species 

 of the genus Cyclopina. If therefore any peculiarity in the structure of these 

 appendages is found, this ought in my opinion to be regarded as an infallible 

 indication of specific difference, unless quite gradual transitions could be stated 

 to occur. But, according to my recent investigations, such transitions do not 

 in reality exist. I have already in Vol. VI recorded 2 species closely agreeing 

 with C. gracilis in the structure of the several appendages, but easily recognis- 

 able by the different appearance of the caudal rami, and I now propose to 

 distinguish 4 other species, 2 of which are likewise closely allied to that species, 

 whereas the other 2 approash nearest to C. longicornis. 



80. Cyclopina norvegica, Boeck. 



(PI. LXIX, Fig. 1). 



Cyclopina norvegica, Boeck, Oversigt over de ved Norges Kyster iagttagne Copepoder. 



Chr. Vid. Selsk. Forhandl. 1864, p. 247. 



Syn: Cyclops salinns, Brady. 



Specific Characters. Female. Body resembling in shape that of 

 C. gracilis, but of rather inferior size, and having the anterior division more 



