HANSEN: ON SIX SPECIES OF KOENENIA. 1 99 



his sub-genus Prokocnoiia and another quite superfluous sub- 

 genus Enkoeiicnia established in order to receive K. mirabilis. 

 Only in one of the (seventeen) specimens seen by Dr. W. S. 

 and myself nine of the thirteen joints of the abdominal flagellum 

 were preserved, in the others only a few or none of them re- 

 mained. Now Mr. Borner spends almost three pages on a de- 

 scription with three figures of this organ; he describes the joints, 

 measures them and counts their setœ very circumstantially. The 

 terminal joint bears two whorls of long plumose setos, and there- 

 fore he thinks it formed by a coalescence of two joints and 

 counts two in the enumeration of the joints, but no vestige of 

 coalescence is seen, furthermore it is impossible to prove that two 

 joints ever were developed, and on these grounds I think it more 

 appropriate to count it as one joint. — He writes (p. 553): 

 y>Das Proximal- oder erste Olied scheint man bisher ganz 

 übersehen zu haben .... Es ist äusserst klein ...» But that is 

 not quite correct, this very short 'joint' is defined on fig. 1 7 in 

 our paper of 1897, but its four shorter setae are not drawn, and 

 it was not regarded as a joint. Mr. Borner writes that the 

 glabrous setœ forming the subapical whorl on six of the follo- 

 wing joints originate as an »innerer» ring in his (contracted) spe- 

 cimens, but he has not seen that this whorl always is inserted 

 on a very short joint consisting of proportionately thick 

 chitine, separated by a membrane from the main part of 

 the joint, or the main joint, and that this subjoint in his speci- 

 mens is withdrawn into the cavity of the main joint (so that 

 the subapical whorl seems to originate as an interior one), while 

 in extended specimens it is turned out, with the base of the setae 

 of the whorl lying quite uncovered. Furthermore he has not 

 seen that all the joints which have their basal portion covered 

 by the glabrous setje from the preceding subjoint, have the proxi- 

 mal part set off by a transverse suture (which is drawn in fig. 

 17 in our previous paper). And if he is to consider his >Proxi- 

 mal-Glied» as a real one, he must at least count all the six 



issued about one month before that of Mr. täÖRNER, the species must be 

 named A". Wheeleri Rucker, This name is used below, but on the plate Mr. 

 Börnk.r's name is added to the species. For the rest the reader is referred 



to the postscript below. 



7 



