INTERNAL ANATOMY. 87 



accessory gland ; * he draws it as a large ram's-horn 

 shaped organ, with the thicker end nearer the ductus 

 ejaculatorius and curling round the posterior end of 

 the abdomen, and as composed of an exterior layer of 

 large, loose, rounded cells and an interior mass of 

 homogeneous material with numerous vacuoles therein. 

 Nalepa describes it as having a soft structureless 

 exterior tunic, not any true epithelial layer ; but the 

 lumen of the gland is surrounded with a plasmodic 

 layer containing large nuclei. This plasmodic layer is 

 said to send honeycomb-like depressions, which give 

 the gland a lattice-work-like exterior appearance, and 

 to send numerous projections into the lumen, which 

 are often united by strings of connective material^ 

 Instead of the nuclei there are often a number of small 

 granules ; the secretion seems like white of egg, and 

 becomes finely granular under the action of reagents. I 

 find it rather difficult to reconcile this description with 

 the drawings illustrating it ; I also find a difficulty in 

 determining which, if either, of the two accessory 

 glands of Glyci/phagus platyg aster this azygous gland 

 of T. longior should be identified with ; it seems to 

 combine some of the qualities of each. 



Gudden draws a somewhat similar azygous accessory 

 gland in the c? of T. siro, but the gland is shorter 

 and the duct longer ; it emerges at the corner of the 

 broad anterior end. 



In Garpoglyphu* anonymus Nalepa describes and 

 figures two accessory glands, t one globular and lying 

 directly over the penis and filling the space between 

 the rectum, the colon, and the caeca of the ventriculus ; 

 the other a large crescent- shaped gland lying anterior 

 to the ductus ejaculatorius and below the ventriculus. 

 Nalepa does not draw any distinction between the 

 histology of these two glands ; he says that the 

 secretory epithelium consists of cells of about 9/i in 

 diameter, which stain deeply with ammonia-carmine; 



* Abth. I,' pp. 209210, pi. ii, figs. 2, 4, 6, a. 

 f ' Abtheil. II,' p. 135, pi. 1, fig. 1, g l , g*. 



