OLIGONEPHRIDIA 



269 



posi 



Fig. 197. — Siphanta. 

 Sagittal section at 30 

 hours, (bid) Blasto- 

 derm, (dr) Dorsal 

 side, igb) Germ band. 

 (mi) Micropylar area. 

 (post) Posterior end. 



emb 



post 



Fig. 199. — Siphanta. Sag- 

 ittal section at four days, {am) 

 Amnion. (,ch) Chorion, {dr) 

 Dorsal side, {emb) Embryo. 

 {ind) Inner (2) and outer (1) 

 indusium. {mi) Micropylar 

 area, {post) Posterior end. 

 {ser) Serosa. 



Fig. 198. — Siphanta. Sag- 

 ittal section at 40 hours, {am,) 

 Amnion, {ch) Chorion, {dr) 

 Dorsal side, {gb) Germ band. 

 {ind) Indusial thickening. 

 {mi) Micropylar area, {post) 

 Posterior end. {ser) Serosa. 



posf 

 Fig. 200. — Siphanta. Ven- 

 tral aspect at five days, {am) 

 Amnion, {ch) Chorion, {ind) 

 Inner (2) and outer (1) in- 

 dusium. {mi) Micropylar 

 area, {post) Posterior end. 

 {ser) Serosa. 



