Description of the Figures. 



Most of the figures in Piate I are from the living object. In the foUowing list 

 the words cam. lue. will be placed after such figures , as are drawn with aid of 

 camera. The rest are drawn with free band. 



y.n 



p.b 



b.c 



se 



m.o 



St 



In 



ep 



hy 



me 



me. e 



a 



s.h 



n.s.l 



n.s.a 



m.c 



pr 



p.o.c 



p.a.c 



a.p 



a.p.c 



ap.l 



p.p 



s,s and 

 me.r 



Fig. 1. 



Fig. 2. 



Fig. 3. 



Fig. 4- 



Fig. 13. 



Fig. U. 



Fig. 15. 

 Fig. 16. 

 Fig. 17. 

 Fig. IS. 



General terms. 

 p.r.c ■■ 



= yolk nucleus. 



= polar body. e ■■ 



= cilia group. l.c ■■ 



= larvai setae. w.s ■■ 



= mouth opening. a.c ■■ 



= Stomach. a.c.d 



= Intestine. 



= epiblast. oo ■■ 



— hypoblast. an.p ■■ 

 = mesoblast. ma ■■ 

 = mesoblast cells. a.g ■■ 



— anus. hm.f 

 = sense hairs of praeoral lobe. cJ.i -- 

 = larvai nervous system. sep - 

 = adult nervous system. g.c - 

 = muscle cord. s.r -. 

 = proboscis. stj- -■ 

 ^= postoral circlet of cilia. b.c. - 

 = praeanal circlet of cilia. f.z - 

 = anal papilla. c.c - 

 -^ cilia of anal papilla. n.r =■ 

 = first pair of adult appendages. t - 



— problematical muscular pro- v.s -■ 

 cesses. v.d.o - 



sc.s = sacs of setae. m.c.f -. 

 = mesoblast bands. 



Piate 31. 

 VnfGrtìììsQd egg 0? M.glabrum. Zeiss E. Oc. 2. Cam. lue. Living. 

 31. glabrum Qgg. First polar body ;j.5. Zeiss E. Oc. 2. Cam. lue. Living. 

 31. glabru7n egg. Second polar body i>.5. Zeiss E. Oc. 2. Cam. lue. Living. 

 -12. Segmentation stages of 31. glabrum. ep = epiblast. luj =^ hypoblast. 

 Mostly Zeiss D. Oc. 2. Cam. lue. All living. 



31. glabrum. 24 hrs. larva, killed with 1% Acetic Acid, '/i^ Leitz Hom. 

 Imm. Oc. 2. Cam. lue, ep = epiblast. ?He = mesoblast. % = hypoblast. 

 Larva of 31. glabrum. b.c ^ bunches of cilia. One day old. Zeiss D. 

 Oc. 3. Cam. lue. Living. 

 The same somewhat older. 

 3f. glabrum. Two days larva. Living. 

 31. glabrum. Larva two and a half days old. Zeiss E. Oc. 2. 

 31. glabrum. Larva of about two days. Living. Zeiss D. Oc. 2. 



: praeoral ring of cilia. 

 : eye. 



broken seta. 

 : nervous system. 

 : alimentary canal. 

 : diverticulum of alimentary 



canal. 

 : Ovum. 



: anal papilla of Comatula. 

 ■■ male. 



: ambulacral groove. 

 : hermaphrodite form. 



connective tissue investment. 



septum. 



ganglion cell. 



sense rods. 



Striae. 



body cavity. 



fibrous zone. 



connective tissue cells. 



nerve root. 



testis. 



vesicula seminalis. 



esternai sexual opening. 



mother cells of testis. 



