THE ANATOMY OF ONOHOLAIiMUS VULGARIS, BAST. Ill 



the right side, in immature females on the left. The cell 

 body, which forms the secreting- portion of the gland, is found 

 at a level a little behind the commencement of the intestine ; 

 from it a duct runs forward to the level of the nerve-ring, and 

 bending towards the midline, opens hy a minute pore in the 

 median ventral line, "112 mm. in front of the ring. 



The cell (PI. 7, fig. 12) is of a flattened oval shape. The 

 nucleus is central, and contains one large pseudo-nucleolus. 

 The protoplasm is hollowed out by large vacuoles, which in 

 some of the specimens contain numerous large basophil 

 granules arranged round their periphery. 



The duct (PI. 7, fig. 4, rgd.; PI. 7, fig. 13) is narrow and 

 cylindrical. It has a fine protoplasmic wall, which is appar- 

 ently an outgrowth from the gland-cell. The contents are 

 homogeneous, and stain with basic dyes. Near its termination 

 the Avail of the duct becomes continuous with the cells of the 

 median ventral line, which separate, continuing the lumen to 

 the pore in the cuticle. 



The glands of the lateral lines lie in series at the 

 margins of the lateral lines. They are found as far forward 

 as the posterior limit of the oesophageal collar and as far 

 backward as the commencement of the rectum. 



They consist of large, pear-shaped cells (PI. 7, fig. 7), 

 with the pointed ends directed to the cuticle. The outlines 

 are sharply marked off from the other cells of the lateral lines. 



Each cell is filled with large rounded granules, with ampho- 

 phil staiuing reaction. The nucleus lies toward the rounded 

 extremity, has a nuclear membrane, chromatin granules, and 

 true nucleolus. From the pointed end a minute duct leads 

 through the cuticle, filled with a hyaline substance which 

 frequently projects beyond the surface as a small spike. The 

 glands are identical with those described by Jagerskiold (10) 

 in Cylicolaimus magnus. 



The tail glands are three in number. In preparations 

 of the entire animal they are exceedingly conspicuous as 

 hyaline, club-shaped masses, extending from the extremity 

 to some distance in front of the anus (PI. 7, fig. 5, tgd.; 



