238 Il'iiioi.s St((tc Lahonitorji of Ndtiiral HiHtovji. 



Since there are only two species of L'nuiiocdhnius known, 

 the key is naturally very simple, and only the most striking 

 differences are used. 



KF.Y TO THE SPECIES OP LIMNOCALANUS. 



Ba>iC(l on tJw ClKtractcrs of tlw Female. 



1 (2). Hook-like process at inner apical angle of second 



segment of outer ramus of fifth leg armed for the entire 

 length of hotli margins with fine symmetrical teeth. 

 Outer apical angle of same segment armed with a 

 stout serrate spine. Second basal segment without 

 plumose seta at outer apical angle. VHicriirns. 



2 (1). Hook-like process at inner apical angle of second 



segment of outer ramus of fifth leg armed on the en- 

 tire inner margin with large teeth aiul on the outer 

 margin with a few tine ones*. Outer apical angle of 

 same segment without spine. Second hasal segment 

 without ])lumose seta at outer apical angle. 



sillOts/.S. 



B((sed on the ('Jtdrdcterfi of the JSLde. 



1 (2). Eight outer ramus of fifth legs 3-segmented (third 



segment indistinct). Hook-like process of second seg- 

 ment of this ramus simply and but slightly curved ; 

 provided with hyaline plate. Inner rami alike. 



luacriii'it^. 



2 (1). Plight outer ramus of fifth legs clearly 2-segmented, 



Hook-like x'l'ocess of second segment of this ramus 

 ■ somewhat sinuously curved. Inner rami unlike. 



>i'ine)iH'iH. 



Liranocalanus macrurus Saks. 



Limnocalanus mdcnrrns. Sars. "()2, p. 2"2(). 

 lAinhocalanus inncnirxs., Forbes, ■82a, ]). 049. 

 Cenlropagen grhnaldii, de Guenie, '86, j). 27(5. 



Liinnocalamis riiacniriis, Nordqvist, "88, p. 31. PI. 1.. Fii;-. 9-11; PI. 

 II., Fi^. 1-5; PI. IIL. Fig. 1-4. 



*Iii (le (iuenie and Richards "Revision."" Fig. 5a in the description of Plate IV. 

 .sliould be Fig. 15a. 



