THl \I\K-l PITM OF THE AXOI >< >\ II N.E. 



In the June number of the BIOLOGICAL BULLETIN (p. ;i . G. 



nl \\ . ( . Curtis have published a paper on "tin- Mar- 



siipium of tin- I 'nionida'." in which they say that the lateral 



inlar r tubes cut off from the original (primary) water 



tubi-- in the in.ir-upimn of the Anodontinae, described by myself 



in \...,' ru.iry, 1910, are not present. In order to show 



thi-.. tin \ publish three figures of horizontal sections throiisji the 



m.ir-upia of tin. ies of Anodontiiuc. 



I nisunderstanding, I want to point out, that, in 



t\M.i.f the figun vrcd to, these secondan- water tube- \KI 



pin SENT, in. v and typically in Fiji. I. In 1 L 



ti.t, :hein -able, while in Fi^. 2 they are not yet 



develop : I tul>csarc not blood vessels, as might be be- 



ln \t-.l .ifti-r -u|M-riiei.il ii. \i-tination. 



|.,r tlie I nnot go into detail, but must refer t<> in\ 



funiif publie.ition illu-trated by micmphotographs) in the 

 .17. :* Museum, where additional facts \\ill be 



pul ili-hnl. 



A. E. OKTMANN. 

 : PITTSBURGH. PA., 



217 



