. Studies on marine ostracods : pt. 1, Cypridinids, halocyprids and polycopids. e exopodite and endo-podite; they are, as we see above, p. 22 homologizedwitli the dorsal cirri on the Annelidan : protests against this view; in hiswork of , p. 466 he writes as follows: ,,Dazu be-merke ich zimachst, daB nach meiner Auffassung diebiidcn Aste, Endopodit iind Exopodit, urspriinglich durehaus nicht gleichwertig sind, sondern(let- cisteic die einfache Fortsetzung des Stammes, der letztere ein Anhang desselben, daherkann man sic nicht wohl auf die gegabelte Gestalt der Parapo


. Studies on marine ostracods : pt. 1, Cypridinids, halocyprids and polycopids. e exopodite and endo-podite; they are, as we see above, p. 22 homologizedwitli the dorsal cirri on the Annelidan : protests against this view; in hiswork of , p. 466 he writes as follows: ,,Dazu be-merke ich zimachst, daB nach meiner Auffassung diebiidcn Aste, Endopodit iind Exopodit, urspriinglich durehaus nicht gleichwertig sind, sondern(let- cisteic die einfache Fortsetzung des Stammes, der letztere ein Anhang desselben, daherkann man sic nicht wohl auf die gegabelte Gestalt der Parapodieu zuriickfiihren, sondern denBasipoditcn mit dem Endopoditen auf deren 8tamni. d(>n Exo])odit(n auf oinen dorsal(>, etwa einen Cirrus. Neither of these two alternatives can hv said to be j)r()ved in anv way. So far both aretn l)c (?on>^i(hrcd as assumptions. I n ni y o p i n i o n t li ere c o u 1 d o r i g i n a 1 1 v s c a r c o 1 v li a- v e beena n y c s s c ii t i a I m o i |( h o 1 o o i c a 1 d i I f c r c n c c cit h c i b c t w c en c x i t c s. Vvx. •Ill r ..Siiiiik! tlldluric Imil (riiiirrif/iriiiis Sciiaff.(Ilmii 1! \v [,\NKi;sTKii. ISSI1. r A/Jh studies on marino Oslracods 25 a 11 (I e 11 d i t e s or between these and t li e distal p art of the p r o t o-podite. These terms seem to be merely expressions for a classi-fication of parts of the same organ which were originallysimilar, a classification based on the relative position of theparts to each other and to the organ, the limb considered as aw h o 1 e. The probability of this assumption ought to be obvious to anyone who has madea thorough comparative morphological study of the post-oral limbs of the P h y 11 o p o d s. The problem of the phylogeny of the Crustacean post-oral limbs must consequentlyas yet be considered as bemg far from settled. Our knowledge of the types of limbs thatcharacterized the Protostraca, the hypothetical ancestral forms of the Crustacea, is still ratheruncertain.


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Keywords: ., bookcentury1900, bookdecade1920, booksubjectostraco, bookyear1920