Fig. 281. — Direct development of Dolichoglossus. — After Bateson. 



The mesoderm is represented by the broken dark line. 



I. Section of blastula. 

 II. Beginning of gastrulation ; End., endodcrm. 

 III. Section of gastrula; W., blastopore; ^c.,archenteron; S.c, segmentation cavity, 

 IV., V. Closure of blastopore, outgrowth of five coelom pouches (M.). 

 VI. Longitudinal section, showing the five parts of the body cavity {b.cA, b.c.-, 

 b.c.^) or coelom. 

 VII. Cross-section; C.A^.S., central nervous system ; Nch., notochord ; 6.C.2, body 



cavity in collar region. 

 VIII, Section at a later stage; D.b.v., dorsal blood vessel. 



