228 "UNLESS OTHERWISE INDICATED" 



GENERAL Unless otherwise indicated, 



1. The species described under a generic name is to be regarded as the type 

 species of the genus; where more than one species is described, the type 

 species is specifically designated. 



2. The text terms and formulae apply to the nemas as viewed in profile. Ref- 

 erences to stain are restricted to acid carmine. 



3. The cuticle is colorless. 



4. The cuticle is striated, sometimes, however, so finely striated as to be 

 resolvable only with the highest powers of the microscope used skillfully 

 under favorable conditions. The division line of the formula is used to 

 indicate approximately the number of striae per millimeter. (See page 227.) 



5. The striae are approximately uniform in width throughout the length of 

 the body except toward the extremities. 



6. The contour is plain. 



7. The striae are not resolvable into secondary elements. The presence of 

 secondary elements is indicated in the formula. (See page 7.) 



8. The longitudinal striations are due to the attachments of the musculature. 



9. There are no obvious series of pores in the cuticle. 



10. There are no eye-spots. 



11. There are no definite valves in the oesophageal bulbs. 



12. The lining of the oesophagus is a distinct, but not conspicuous, feature, 

 practically throughout its length. 



13. The intestine is set off from the oesophagus by a distinct constriction. 



14. The arrangement of the granules in the cells of the intestine is not such 

 as to give rise to a tessellated effect. 



15. There is no pre-rectum. 



16. The rectum extends inward and forward at an angle of about thirty to forty 

 degrees. 



17. The tail, at least that of the female, is straight, or nearly so. 



18. The somatic, as well as the posterior cervical, setae, are perpendicular to 

 the cuticle, or nearly so. 



19. The renette cell lies behind the base of the neck. 



20. The nerve-ring surrounds the oesophagus rather squarely. 



21. Absence of the formula for either sex indicates that that sex is unknown 

 at the present time. 



FEMALE -Unless otherwise indicated, 



22. The vagina is understood to lead inward at right angles to the ventral 

 surface. 



23. The uterus is more or less straight. 



24. The eggs are thin-shelled and smooth, and are deposited before segmenta- 

 tion begins. 



MALE Unless otherwise indicated, 



25. There is no bursa. 



26. The tail of the male is similar to that of the female in form. 



27. The spicula are two in number, equal in size, and appear moderately arcu- 

 ate when viewed in profile, and are simple, i.e., without obvious extra 

 component longitudinal stiffening elements. 



28. The accessory piece (or pieces), gubernaculum, lies more or less parallel 

 to the spicula, and has no inward or backward-pointing apophysis. 



