27 (26) Penial setae two to three per bundle, strongly curved distally (Fig. 48). Atria 



about five times longer than wide (Fig. 49) Phallodrilus obscurus 



Figure 48 (top). — Penial seta. 



Figure 49 (bottom). — Lateral view of male genitalia; 

 A, atrium; P, prostate gland. 



27 (26) Penial setae 7 to 13 per bundle; hooked or simple- 

 pointed distally. Atria not of above form 



f? 



28 



28 (27) Penial setae 10 to 13 per bundle; hooked distally (Fig. 50). All somatic setae 

 bifid. Atria about eight times longer than 

 it is wide (Fig. 51) Phallodrilus coeloprostatus 



Figure 50 (top). — Penial seta. 



Figure 51 (bottom). — Lateral view of male genitalia; 

 A, atrium; P, prostate. 



a 



28 (27) Penial setae 7 to 10 per bundle, simple-pointed distally (Fig. 52). Posterior 



somatic setae simple-pointed. Atria small, pear-shaped, erect (Fig. 53) 



Phallodrilus pan'iatriatus 



Figure 52 (top). — Penial seta. 



Figure 53 (bottom). — Lateral view of male genitalia; 

 A, atrium; P, prostate; Ps, penial setae. 



29 (23) Coelomocytes large and very numerous (Fig. 54). Prostate 



gland diffuse 30 



Figfure 54.— Anterior segment; C, coelomocytes. 



29 (23) Coelomocytes absent, or small and few in number. Prostate gland compact, or absent. 31 



13 



