102 



ILLINOIS BIOLOGICAL MONGRAPHS 



[102 



EXPLANATION OF PLATES 



Abbreviations 



ne nerrve ending 



np 



nph 



ns 



ad anterior dorsalis nerve 



al anterior lateralis nerve 



as anterior sensory field 



av anterior ventralis nerve 



b, be genital atrium nt 

 bl bursa glands o 

 br cerebral ganglion od 



c, ce cecum on 

 ca caudal pocket op 

 ceg cercaria germ-ball ope 

 eg caudal gland cells opn 

 cr cirrus pouch or 

 cs collar spines ot 



d, dl salivary gland duct ov 

 dc dorsal commissure p 

 die dorsolateral commissure pa 

 dp profundus of dorsalis nerve pb 

 ds superficialis of dorsalis nerve pc 

 e epithelium pd 

 ec ectoderm pe 

 eg excretory granules pg 

 eh evertible prepharynx pgl 

 ep excretory pore pi 

 es esophagus po 

 et excretory tube pv 

 ev excretory vesicle pvc 

 ex excretory tubule pvi 

 fc flame cell r 

 g genital pore, birth pore rm 

 gb germ-ball rp 

 glc cystogenous cell sg 

 i intermedius nerve sp 

 igl digestive gland st 

 1 longitudinal muscle cell t 

 Ic Laurer's canal te, t],2 testis 

 le lateral eye tr 

 Ig localized germinal epithelium u 

 Ip posterior locomotor pocket v 

 Is lateral suctorial groove vd 

 m myoblast ve 

 me median eye-spot v£ 

 mp musculus preoraUs vi 

 n, nc nerve cell vs 



nervus palatinus 



pharyngealis nerve 



subesophageal commissure 



nerve trunk 



ovum 



oviduct 



oral nerve ring 



optic nerve cell 



optic cup 



optic nerve 



oral sucker 



ootype 



ovary 



pharynx 



parenchyma 



polar body 



preacetabular commissure 



posterior dorsalis nerve 



preoral sense endings 



primitive genital pore 



locomotor pocket glands 



posterior lateralis nerve 



postacetabular commissure 



posterior ventralis nerve 



postero-ventrolateralis commissure 



postero-ventral intermedius nerve 



rhabdocoel gut 



ramus muscularis of the lateralis nerve 



ramus palpalis of the lateralis nerve 



salivary gland cell 



acetabular spine 



stylet 



basement membrane 



transverse muscle fiber 



uterus 



vagina 



vas deferens 



vas efferens 



vitelline follicles 



vitelline duct 



acetabulum 



The lines in figures 6, 26, 51, 146, 147 have a value of 0.5mm; in figures 5, 7, 13-17, 19-20, 

 27-29, 31-34, 36, 37, 44-46,54, 56, 57, 61, 68-75, 77, 82, 83, 89, 91,92,97-99, 101, 102, 104, 107, 

 108, 111-113, 118, 119, 121-133, 136, 138, 140, 141, 145, 150-154, a value of 0.01 mm; in all 

 other figures, a value of 0.05 mm. 



