30 TAQR SKOGSBERG 



little verruciform appendage, unjointed and without bristles. In my opinion this appendage 

 corresponds to the exopodite of this limb. In the case of this appendage in the genus Conch- 

 oecia this explanation lias nlicady been adopted by preceding investigators; (G. W. MOLLER, 

 1894, p. 49); in Thauniatucypris, on the contrary, this appendage is not even mentioned in 

 our only description of this genus (G. W. MCller, 19U6 a). In most species of the genus 

 Conchoecia the ])roximo-medial one of these appendages is represented by a small, verruciform 

 ])rocess, which is furnished distaUy with a single bristle; in other species of this genus there is 

 only a bristle developed at tliis place; in a few forms there is no trace at all of this appendage. 

 In the species of the genus Euconchoecia that I had an opportunity to investigate this append- 

 age was represented only by a bristle; no trace of any verruciform process could be observed. 

 In Halocijfris this appendage seems always to be quite absent. Thamnatocypris, which is 

 in many respects the most primitive genus among the H a 1 o c y p r i d s, is very inter- 

 esting in this respect. In this genus there is at the corresponding place on the mandible 

 ,,eine ovale .Warze mit 2 Borsten an ihrem Vorderrand" (G. W. MULler, 1906 a, p. 41). 

 This appendage, which has not been observed by preceding investigators in the case of 

 the genera Conchoecia and Euconchoecia, nmst certainly be regarded as an epipodial appendage. 

 This assumption is supported by its position; that it can scarcely be homologous with the 

 exopodite is shown, of course, by the fact that another appendage, presumably homologous 

 with the exopodite, is found on this joint. 



With regard to this appendage in the genus Thaumatocypris G. W. MtJLLER writes as 

 follows, 1906 a, p. 42: ,,Bemerkenswert ist der warzenartige Anhang an der medialen Seite 

 des 1. Tastergliedes. Einen Anhang tragt dieses Glied bei den s t r a c o d e n ziemlich 

 allgemein, aber deutlich lateral ( Podocopa) oder dorsal (Mehrzahl der Myodoeopa). Dieser 

 Anhang wird als AuBenast des Tasters gedeutet. Es kann kaum zweifelhaft sein, daB der hier 

 beschriebene Anhang dem als Bxopodit bezeichneten zum mindesten der Myodoeopa homolog 

 ist, doch widerspricht dieser Deutung die deutliche mediale Lage. Wahrscheinlich haben wir 

 es hier mit einem auf die mediale Seite verschobenen AuBenast zu thun, wenigstens scheint 

 mir diese Deutung noch die einfachste und nachstliegende, sobald wir iiberhaupt eine Homo- 

 logie dieses Anhangs und des sogenannten Exopodits bei den anderen Ostracoden 

 annehmen." 



For reasons given above I cannot accept the interpretation of this appendage as homo- 

 logous to the exopodite in C y p r i tl i n i d s, H a 1 o c y p rids and P o 1 y c o p i d s. On the 

 other hand it seems to me rather likely that it is homologous with the vibratory plate in 

 C y }:) r i d s, 1) a r w i n u 1 i d s, N e s i d e i d s, C y t h e r i d s and Cytherellids. The 

 fact that this appendage is placed laterally in the five latter groups and medially in Thaumato- 

 cypris (and other H a 1 o c y p r i d s) cannot, as G. W. MUller has shown in the quotation 

 given above, be considered any decisive argument against this homologization. (It is to be 

 noted that the exopodite in the Halo c y p rids too is somewhat, though only slightly, 

 displaced medially). If this line of argument is correct, the consequence of it would be 

 that the vibratory plate on the mandible inCyprids, I) a r w i n u 1 i d s, N e s i d e i d s, 

 ( ' y t h e r i d s and Cytherellids is not, as lias been assumed by preceding authors. 



