74. Cythere albomaculata, Hand. 



(PI. I.XXVIII) 

 fotre tilhnmnnilHl.i B;ii((I, I'.nlr.h I nl..iii(,-.lr;ic;i, p. Hi'), I'l. XX, fl. 7. 



Specific Characters. Female, Shell teen latr-ially, oval renilonn in sh;ip , 

 :i'-.i beii'h 1 about in UK' middle and only slightly exceeding hall the length, 



doi ,al maif/in iic;iily ,liai;dit in Hie middle ;md joining UK- hind edj/e willionl 

 any inlervendin^ an^le, vcnti;il margin deeply siimated in limit ol the middle 

 ;ind slightly ciuwed upward' Ix-lmid, ;mlerior extremity well rounded oil and 

 < oir.idrrably bowed below, posterior scarcely narrower and slightly anjMilar in 

 tin middle; -seen dorsally, oblong fusiform in outline, with the greatest width 

 in the middle and '.lijdilly < -.reding 2 /r, of the length, both extieunlies pointed 

 and iie;niy equal. Surface of valves smooth, width scattered i;iMicr small tu- 

 berdes, inaijimal zone nanowei than in C. fi/lra, but uo'.srd by niim 'toir^ 

 ly set poie < hamicls, ant'iioi cd^e, very densely hairy. Antenna? remark- 

 ably shot I and stout, the anterior ones with the teniiinal pait but littl 

 than MM- dr.tal -j'.inent of the ba'.al pait, last joint aboul hall the l<-ii}'h! ol 

 the preceding One, :md aimed with a lalhei ,|ioi u - spine leseiiibluu' those on 

 the middle joint. Mandibiilar palp with the inner distal seta of the penul- 

 timate joint p-maikably stion<r and ialciloim curved. Maxilla 4 with the distal 

 joint ol the palp shoitei than in (]. Lutea. 



Male. Shell ol lathei |;HJM-I si/e than in i-inale and much more elongate, 

 with the antetioi e;.;|iemity strongly bowed below and the venfial sinus more 

 .haiply mai) '.pnlativc appendages very large, with the basal pait lounded 



oval in shape; teniiinal pait produced in iiont to a somewhat irregularly curled 

 lappet, but (jiiite obtuse behind. 



f.olom oi '.hell yellowish jMay, niej-iilaily < loiided with 21 dail.n hue, ,<, as 

 to leave a number of more 01 I- iiidilei aieas; limbs dark yellow. 



Length of adult iemale O.M mm., of male 0.96 mm. 



/''marks. Th- plioni and n by Baird and most otln-r 



authors of this species refer only to the male sex. In the |i male the shell is 



ol a much shorter and stout'-i shape, more like that of the pKcdii^ species, 



ly to be confounded with it. On a closer examination, however, it 



may readily be distinguished by the closely striated marginal zone of the valves 



and the dense clothing of hairs in particular on the anterior edges, as also by 



the very dilii rent colour of the shell. In the slriK liiral detail, OHM well-marked 



differ- uses iiom the pre< ;>ecies are lound, as noted in the ,-if - ijplion. 



'/ \ ' 



