168 



LEECHES 



Fig. 23. Dorsal and lateral views of the male genital atrium 

 of Nephelopsis obscura, after Moore. 



61. Atrial cornua spirally coiled, like ram's horn (Fig. 23); 



Nephelopsis Verrill 1872 

 One species Nephelopsis obscura Verrill 1872 



— Atrial cornua not spirally coiled 62 



62. All annuli of approximately the same width. 



Erpohdella puctata (Leidy 1870) 



— Every fifth annulus subdivided as in 56 above (occa- 

 sionally 2 out of every 5 are subdivided) 63 



63. Eyes absent. Dina anoculata Moore 1898 



— Eyes present 64 



64. Eyes, 3 pairs; 2 annuli between gonopores. 



Dina lateralis (Verrill 1871) 



— Eyes 4 pairs; 3-3 J annuli between gonopores . . . . 65 



65. Length about 2 cm; a few dark spots or no pigment. 



Dina parva Moore 1912 



— Length about 4-5 cm; with a dark median stripe and 

 blotches. Dina dubia Moore and Meyer 1951 



