Stiiilii'S on riKiriiic Ostracods 459 



distal bristles'". The bristles whose distal pair of secondary spines are more powerfid than the 

 proximal ones are called „triaena bristles". The short, weak bristles are termed ,, dwarf bristles". 

 Bristles on the anterior edge of the second e n d o p o d i t e j o i ii t : 

 The four long powerful bristles are called ,,niain bristles" and are denoted proximo-distally 

 by the letters a — d. The bristles situated proximally of the main bristle a are denoted as 

 ,, proximal bristles". The row of cleaning bristles within the c-bristle is called ,,the lower row". 

 The cleaning bristles in this as well as in the other rows are always counted from front to back. 

 The anterior bristle of the end joint is called ,,the end claw". 



Maxilla: — Medial bristles of the protopodite: The bristle situated dorsally, just 

 in front of the fastening of the epipodial appendage, is called ,,the dorso-proximal bristle". 

 The bristle or bristles situated dorsally on the distal part of the basale are called ,,the dorso- 

 distal bristles". The bristle or bristles situated ventrally, at about the middle of the basale. 

 are called ,, ventral bristles". The short bristle, situated somewhat distally of this bristle (these 

 bristles), is called ,,the short ventero-distal bristle", to distinguish it from the long bristle that 

 issues ventero-laterally on the distal boundary of this joint, which is called ,,the long ventero- 

 distal bristle". 



Sixth 1 i m b: — The bristles situated along the anterior edge of the anterior sole- 

 shaped flattened part of the ventral side are called ,,the anterior ventral bristles", the other 

 ventral bristles are called ,,the posterior ventral bristles". 



Remarks: — The literature is not clear as to the number and the boundaries of the joints Thf nuinhfr nj ihe 

 of the first antenna. In most cases no information is given on these points; and the writers /"""■' "^ ''"' •^""*' 



111- ■ !• •■! anlenni. 



who do deal with these questions make statements that contradict each other. It is certainly 

 true that variation in these characters does occur in the genus, but these contradictions seem 

 to be due, mostly if not entirely, to mistakes of one kind or another on the part of the authors. 

 I shall first give rather cursorily some indications of mistakes made with regard to the 

 boundaries between the joints, which have caused statements that are certainly incorrect to 

 be made about the number of bristles that is characteristic for each joint. Most writers give 

 no or practically no information in the text as to the number and position of the bristles. To 

 judge from their figures, however, it would appear that rather considerable variations existed 

 within the genus. Thus G. 0. Sars, 1887, p. 18, states in his genus description that the joint 

 next to the distal one on the female first antenna is armed with a powerful claw and also 

 with a pair of narrow, annulated bristles, the end joint would have four annulated bristles, 

 furnished with sensorial filaments on one edge. The a-claw and the e-bristle would thus belong 

 to the sixth joint. The same author writes on p. 12 in the description of the genus: „articulo 

 penultimo in utroque sexu ungue forti antice curvato armato". Although G. W. MtiLLER 

 states in his genus diagnosis, 1894, p. 217, that the a-claw belongs to the distal joint and gives 

 in the accompanying figures an exposition of the number and position of the bristles on this 

 limb that is on the whole quite correct, subsequent authors make mistakes, all the same, with 

 regard to these things. Thus G. S. Brady and A. M. Norman write, 1896, p. 628, in the diagnosis 

 of the family, ,, penultimate joint in t)otli sexes furnished with an unguis" an expression 



