280 



H. J. VAN CLEAVE 



SUMMARY OF CELL CONSTANCY IN THE GENUS EORHYNCHUS, 

 WITH TABLE OF RESULTS 



Consideration of the facts presented in the foregoing parts of 

 this study has led the writer to a firm behef in a remarkable de- 

 gree of constancy in all the somatic structures in the genus Eo- 

 rhynchus. Failure to demonstrate this beyond a doubt for all 

 the organs is due to physical limitations, primarily, rather than 

 to conflicting data, for in every instance where a positive count 

 has been made under conditions precluding the possibility of 

 error in manipulation, the same number and arrangement of the 

 nuclei has been found in every individual of the same species. 

 Table 1 summarizes the results found for the five species studied. 



TABLE 1 



OBQAN OR TISSUE 



EO.GBACILI- 



8ENTIS 



EO. LONQI- 

 ROSTRIS 



EO.EMTDIS 



EO. CYLIN- 

 DBATU8 



EO. 



TENELLUa 



Subcuticula 



Terminal proboscis ring of nuclei 



Terminal proboscis organ 



Leminisci, 1 and 2 



Retractors of hooks 



Wall of proboscis-receptacle 



Proboscis invertors 



Proboscis sheath retractors: 



Dorsal 



Ventral 



Cement gland 



Cirrus 



Vas deferens. 



Muscle sac: 



Inside 



Wall 



Inverted part of male (posterior) 



Vagina 



Uterus 



Vaginal sphincter 



Selective apparatus 



Stays of selective apparatus. . . . 

 Ligaments at orifice of female . . . 



Brain 



Genital ganglion 



Body musculature 



6 

 12 

 5 

 3 

 4 

 6 

 4 



2 

 2 

 8 

 4 

 2 



2 



2 

 15 

 11 



2 



2 



8+ 



2 



2 

 108 (?) 

 18 

 30 



5 

 3 



2+ 

 4 



2 



2 



16 



2 



2 



12 



2 



94(?) 



8 

 2 

 2 

 12 

 2 



