294 



H. J. VAN CLEAVE 



ABBREVIATIONS 



br., brain 



bu., bursa 



biv., body-wall 



c, cuticula 



cc, circular canals 



eg., cement gland 



ci., cirrus 



cm., circular body muscles 



cr., cement reservoir 



/■/., fan ligament 



gg., genital ganglion 



go., genital opening 



ht., terminal hook 



hb., basal hook 



km., middle hook 



ip., proboscis invertor 



I., 1.2, lemnisci 



lor., longitudinal canal 



lin., longitudinal body muscle 



ms., muscle sac 



po., terminal proboscis organ 



prn., nuclear ring of proboscis 



r., receptacle of proboscis 



s., subcuticula 



sa., selective apparatus 



sn., subcuticular nuclei 



sr., sperm reservoir 



ssa., stay of selective apparatus 



ta., anterior testis 



tp., posterior testis 



?/., uterus 



v., vagina 



vd., vas deferens 



ve., vas efferens 



vs., vaginal sphincter 



EXPLANATION OF FIGURES 

 A camera lucida was used in making all the drawings included in the figures. 



Figs. 



Fig. 



Fig. 



Fig. 



Fig. 

 X 310. 



Fig. 

 nuclei. 



1 to 16 Represent Eorhynchus gracilisentis (Van C). 



1 Proboscis of hematoxylin-stained specimen in balsam. X 97. 



2 Hooks from the same specimen as shown in figure 1. X 310. 



3 Embryos from body of mature female. X 310. 



4 Portionof body wall showing a subcuticular nucleus. Sagittal section. 



5 Sagittal section to one side of that shown in figure 4, showing muscle 

 X 310. 



Fig. 6 Sagittal section through proboscis showing terminal proboscis organ 

 and hook retractors; hematoxylin. X 310. 



Fig. 7 Sagittal section through proboscis receptacle of inverted specimen 

 showing terminal organ of the proboscis. X 310. 



Fig. 8 Sagittal section through base of proboscis receptacle showing location 

 of brain. X 310. 



Fig. 9 Cement gland of male; toto mount. X 97. 



Fig. 10 Transverse section through tip of proboscis showing terminal ring 

 of twelve nuclei. Iron hematoxylin. X 310. 



Figs. 11 and 12 Reconstructions of female genital tract. X 310. 



Fig. 13 Female genital tract in toto mount; hematoxylin. X 310. 



Fig. 14 Sagittal section of same, in region of vaginal sphincter. X 310. 



Fig. 15 Fan-shaped ligament at side of female genital orifice. X 310. 



Fig. 16 Retractors of the proboscis receptacle, from di.ssection. X 310. 



