Bxpkmafioti of Plate VI 173 



In Jigs. 1-t — 37, represent iiiy iiuih sexual organs in I'alpalores and Laniatores, the following lettering 



Is used. 



a. sheath of penis ; Ij. corpus peni.s ; c. glaiis penis ; cb. limit between corpus and glans 

 penis ; d. distal tube of glans ; d'. proximal portion of the dorsal part of glans — in Laniatores — 

 terminating in the distal tube ; e. ventral part of glans in Laniatores ; g. one of the lubricating 

 glands of the sheath ; a. operculum genitale ; vs. pars ejaculatoria of vesicula seminalis ; w. thin- 

 skinned, window-like area on glans in Ischi/rojjsalis ; mc. muscle or muscles within corpus penis 

 to glans ; «i«. muscle to the front part of the sheath in Palpatores ; nif. muscle on the posterior 

 part of the sheath in Ischyropsalis ; ing. muscle on the posterior part of the sheath in 

 Xemastoma ■, mh. musculi dilatatores of the sheath in Nemasloma; mo. muscle to operculum 

 genitale in Laniatores ; mp. musculi protractores ; mq. crossing muscular strata on the sheath in 

 Laniatores ; mr. musculi retractores penis ; tmc. tendons of the muscles (or muscle) mc. to glans. 



Fig. 14-. Penis, without sheath, of Platyhnnus cornigcr Herni., from above; x 22. 



Fig. 15. Glans and distal part of corpus penis of the organ shown in fig. 14, from the right; x 45. 



Fig. 16. Penis, without sheath, of Sclerosoma quadridentatum (Juv., from above; x 3iS. 



Fig. 17. Glans and distal part of corpus penis of the organ shown in fig. 16, from the right; x 91. 



Fig. 18. Sheath and penis of Ischyropsalis dispar E. S. ; x 16 ; the sheath is seen from above, 

 its distal part and musculi protractores and retractores omitted ; the penis is turned somewhat 

 to the left. 



Fig. 19. Glaus and distal part of corpus penis of the organ shown in tig. 18, from the right; x 52. 



Fig. 20. Penis, without sheath, of Nemastoma luguhre O. F. MiilL, seen oljliquely from above and 

 from the left side ; x 41. 



Fig. 21. Glans and distal part of corpus penis of the organ shown in fig. 20, and in the same 

 position ; x 1 84. 



Fig. 22. Sheath with penis of Xemastoma argenteodumdatum E. S., from above, x 43; of the 

 muscles mp. on the right half and m.g. on the left half are omitted. 



Fig. 23. Proximal part of the sheath with penis of the organ shown in fig. 22, from below; 

 x 70 ; of the muscles only ing. are drawn. 



Fig. 24. Pro.ximal part of the same penis without sheath, from above, showing the two internal 

 muscles ; x 72. 



Fig. 25. Glans and distal part of penis of the organ shown in tig. 22, from above; x 210; the 

 transverse stripes on corpus penis are shown. 



Fig. 26. Penis, without sheath, of Trogulus sinuosus W. S. ; from below and with the apex turned 

 by pressure somewhat to the left ; x 40. 



Fig. 27. Glans and distal part of corpus penis of the organ shown in tig. 26 and in the same 

 position; x 120. 



Fig. 28. Sheath with muscles, lubricating gland, operculum and penis of Biscocyi-tus testudineus 

 Holmb., from the left side ; x 22 ; of mp. a greater part is removed in order to show the 

 crossing muscular layers mq. ; of 7nr. only a part is shown. 



Fig. 29. Penis, without sheath, of the organ shown in tig. 28, from above ; x 22. 



Fig. 30. Glans and distal part of corpus penis of the organ shown in fig. 29, from above ; x 76. 



