102 



TAGE SKOGSBBRG 



The names of llicxi 

 main uriiiiiis. 



SunUHanj oj llif dij- 

 ferences between mi/ 

 'ipuiion of the fiindn- 

 iiiental classificalinn 

 iif the recent (Jslm- 

 i-'ids and that n/ 

 (r. O. Sars and 

 a. W. Mullei: 



I'hr mulual. relations 

 iif nil) five main 



i^niups. 

 ' 'iipridinifurmei, 

 ffnlovyjiriformex 



and 

 /'idi/eiil/ifiirnirs. 



I did not think it convenient to use the nomenclature introduced by G. 0. Sars fur 

 these groups. It seems unsuitable for the following reasons. The names Myodocopa and 

 Podocopa have been used by preceding writers in different senses; if the name Myodocopa is 

 retained for the C y p r i d i n i d s or for the H a 1 o c y p r i d s, it would be used in a new- 

 sense, differing from both G. 0. Sars' and G. W. MUller's view. If we retain the names 

 Myodocopa, Gladocopa, Podocopa and Platycopa it would be impossible to introduce a thoroughly 

 consistent nomenclature. G. O. Sars took these names from the structure of the second 

 antenna in the different groups: Myodocopa refers to the muscular structure of this limb, 

 |xijwdiy;i; et xcotzvj, „the muscular oar"*. Gladocopa refers to the fact that both the exopodite and 

 the endopodite are developed as natatory implements, xKddoc. et xwTrrj .,the branched oar". 

 Podocopa refers to the fact that this limb is developed as a crawling leg, tioooz et xwTiy, ,,the 

 leg-shaped oar". Platycopa refers to the flatness of the same appendage, -XaTu; et xwtiyj, 

 ,,the flattened oar". It seems impossible to find a suitable analogous name for C v p r i d i n i d s 

 and H a 1 o c y p r i d s, as these groups have second antennae of almost quite the same type. 

 It is also to be noted that the term Cladocopa suits one genus among the Halocyprids 

 as well, namely Thaumatocypris. 



For these reasons it seems to me most convenient to give quite new names to these five 

 groups, which, according to G. W. MOller, may be termed sub-orders. I have chosen for them 

 the terms: Cypridiniformes, Halocypri formes, Polycopifonnes, Cypriforines and Cytherelli formes. 



The difference between G. 0. Sars', G. AV. Muller's and my classification is shown in 

 following table: 



th 



Myodocopa G. W. MULLi':r> 



Podocopa 



Myodocopa 

 Cladocopa 



Podocopa 

 Platycopa 



G. 0. Sars 



Halocypriformes 

 Cypridini formes 

 Polycopifonnes 



Cypriformes 



Cytherelliforme^. 



The question of the mutual relations between these groups seems to be exceedingly 

 difficult to answer satisfactorily. 



G. W. MUller assumes that H a 1 o c y p r i f o r m e s and P o 1 y c o p i f o r m e s 

 are more closely related to each other than they are to C y p r i d i n i f o r m e s; P o 1 y c o p i- 

 formes are to be considered as a small branch of the first-mentioned group, a branch 

 that has preserved primitive features in a number of respects. The characters that show 

 the closer relationship of these two groups would be the position of the first antenna high 

 up on the forehead and the unsymmetrical exit of the sexual organs. I think that (t. W.- 

 MOller has been somewhat too hasty in this deduction. These two characters, the place 

 of attachment of the first antenna and the way in which the sexual organs open out, 



* G. O. Sars writes, 18G5, ]>. 10: ,,Uoii sidslc Del ;if SaiiiiiK'nsaetiiingeu, y.w.j')]. Aai'f, or spfciell aiivendl 

 |)aa disse Aiiteniier, da deres Belydniiig soiii Bcvacgelsoorganer er nogft, man vil finde mere eller luindn! lydeligl udpraeget 

 ijaar igjfiiiniu den liele store Krcbsdyrafdcling. Entomostraca. (The last part of llw compmind. xto.iii, oar, is specially 

 used for these aiiteiiiiae, as tlieir importaiKc as locumntory oruans will hr fdiiiid iihpit (ri' less niarUnl lliriiiifih(uit tlie 

 whole great Crustacean group Eniainustraco.) 



