PLATE XXX. 



Fig. 1. Horizontal section of Head region of Orobd. WltUriHUii. x 23. oc. eyes. 



oe. mouth-cavity. /(. nerve. 

 Fig. 2. Horizontal section of OihIhI. fJinKit. x 23. st. stomach. c<i'c. blind sacs. 



int. intestine. 

 Fig. 3. Sagital section of the front end of Orobd. Wldtmmii. x 5. 

 Fig. 4. Cross section of Orohd. WJdtwani. x 23. rd. dorsal vessel, oe. mouth- 

 cavity, vl. lateral vessel, nph. nephridium. viiph. bladder of nephrium. 



vv. ventral vessel, n. nerve. 

 Fig. 5. Sagittal section of the eye of Orohd. Ijiniai. x 300. n. nerve, cv. 



visual cells. 

 Fig. 6. Section through the spherical dilatation of blood sinus, with the nephridial 



funnel in it. sv. blood sItius. /)(/. nephridial funnel. 

 Fig. 7. Section through a testicular capsule, x 800. sp. group of sperma- 



tozoids. 

 Fig. 8. A portion of horizontal section of Orobd. Ijimu'i. x 55. vr. ventral vessel. 



/(. nerve, tffi. testes, r»^;/*. nephrial bladders. 



