2 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 122 



I wish to thank the following persons who have contributed speci- 

 mens on which these three new species are based : Dr. Jean E. Pugh, 

 Mr. C. W. Hart, Jr., Mr. Mark Odell, and Mr. John M. Rutherford. 



Ornithocythere, new genus 



Diagnosis. — -TermiQal tooth of mandible with cusps. Copulatory 

 complex of male without finger guard ; peniferum resembling inverted 

 head of bhd; ventral portion of peniferum with heavily sclerotized 

 beaklike prominence directed anterodorsally; base of beak provided 

 with subcu'cular aperture, thi'ough which presumably tip of penis 

 emerges to smiace. Penis complex with spermatic and prostatic 

 portions contiguous throughout their length, not separated as in 

 members of Ascetocy there; penis complex slightly longer than half 

 anterior-posterior dimension of peniferum at level of base of penis. 

 Clasping apparatus not clearly divisible into vertical and horizontal 

 rami, with proximal and distal portions disposed at angle of approxi- 

 mately 60°; vertical ramus convex posteriorly with mternal and 

 external borders entire; horizontal ramus with external border entire 

 and internal border with four evenly spaced teeth; ramus terminating 

 in four denticles. 



Type-species. — Orniihocythere waltonae, new species. 



Remarks. — The most distinctive feature of this monotypic genus 

 is the sclerotized beaklike prominence of the peniferum (see "Rela- 

 tionships" under 0. waltonae). 



Gender. — Feminine. 



Name. — From the Greek "ornis," meaning bird, plus generic name 

 cythere, alluding to the resemblance of the peniferum to the head and 

 neck of a bird. 



Orniihocythere waltonar, new species 



Male. — Eye present. Shell (fig. 16) highest posterior to mid- 

 length with dorsal margin tapering ventrally only shghtly less sud- 

 denly anteriorly than posteriorly; ventral margin of shell entire; 

 submarginal setae rather evenly spaced anteriorly, ventrally, and 

 posteriorly, very few dorsally. 



Copulatory complex (fig. la): As described in generic diagnosis; 

 in addition, dorsal finger moderately slender with apex reaching 

 level of base of penis complex; ventral finger slender and subparallel 

 to clasping apparatus, latter extending ventrally only sHghtly beyond 

 ventral margin of peniferum. 



Female. — Eye present (not illustrated because destroyed in 

 allotype). Shell of triunguis female (fig. Ic) distinctly larger than 

 that of male with maximum height posterior to midlength; ventral 

 margin of shell with distinct emargination just anterior to midlength; 



