159 



69. Cytheridea papillosa, Bosquet. 



(PI. LXXIII, PI. LXXIV, fig. 1.) 

 Cytheridea papillosa. Bosquet, Entom. fossiles des terr. tertiaires de la France, p. 42. 



PI. II, fig. 5 a d. 

 Syn: Cyprideis Bairdii, G. O. Sars. 



Specific Characters. Female. Shell, seen laterally, oblong oval or some- 

 what reniform in shape, scarcely higher in front than behind, greatest height 

 about half the length, dorsal margin almost straight and horizontal, joining the 

 hind edge by an even curve and sloping slowly in front, ventral margin very 

 slightly sinuated, anterior extremity broadly rounded off, posterior obliquely 

 deflexed, terminating below in a somewhat exerted obtuse corner; seen dor- 

 sally, regularly oblong ovate in outline, with the greatest width about equal to 

 the height, anterior extremity pointed, posterior more obtuse. Surface of shell 

 smooth and shining, slightly hairy at each extremity, and ornamented with 

 scattered very conspicuous rounded tubercles or papillae of whitish colour. 

 Anterior antennae very robust, with the distal segment of the basal part con- 

 siderably expanded and exceeding in length the terminal part, middle joint of 

 the latter only slightly longer than the 1st, last joint about half as long. Post- 

 erior antennae with the spine attached to the end of the penultimate joint 

 posteriorly, claw-shaped, resembling the apical claws. Vibratory plate of mandi- 

 bular palp with one long plumose apical setae and 2 much smaller lateral ones. 



Male. Shell more elongate than in female, with the ventral margin more 

 deeply sinuated and the hind extremity more obliquely produced. 1st right leg 

 with all the joints of the terminal part coalesced, apical claw very strong and 

 abruptly curved; 2nd right leg with the terminal part reduced to a small simple 

 lamella; 2nd left leg much coarser than in female, with the apical claw falci- 

 form curved and denticulated at the end; 3rd right leg with 4 bunches of hairs 

 on the 1st joint of the terminal part. Copulative appendages with the basal 

 part obliquely oval in shape, terminal part rather large, slightly bilobed, anterior 

 lobe triangular, posterior much broader and somewhat boot-chaped. 



Colour of shell light reddish brown clouded in some places with a dark 

 violet hue; limbs yellow-coloured. 



Length of adult female 0.95 mm., of male 1.20 mm. 



Remarks. This form was described as early as the year 1850 by Bosquet 

 from fossil tertiary shells, and has subsequently been observed in recent state 

 by several authors. It is easily recognised by its smooth, reddish brown cou- 

 loured shell and by the very conspicuous opaque whitish papillae on its surface. 



