(149) 



EXPLANATION OF FIGURES. 



(For all figures.) 



a e b = anterior enteric branch, 



b = brain, 



be = bursa copulatrix. 



be = brain eyes. 



c c = central canal of the granule-gland, 



cht p — chitinous processes of the male copulatory organ. 



con — connective tissue. 



d sh = duct of shell gland. 



e b = enteric branch, 



em = enteric mouth, 



fl = flattened epithelium, 



g g _ granule-gland, 



gl cl = canals of the granule-gland. 



gl c = glandular cells of the granule-gland. 



mi = main intestine. 



mo = outer mouth, 



msc = musculature, 



ov = oviduct. 



ov d = opening of the vasa deferentia into the seminal vesicle, 



p b c — papillae of bursa copulatrix. 



ph s = pharyngeal sac. 



p n = parenchyma nuclei. 



ps = penis, 



s d = seminal duct, 



s p = spines of penis. 



s v = seminal vesicle, 



t = testes. 



t e = tentacular eyes. 



ut = opening of uterus to oviduct. 



v d = vasa deferentia. 



S, — male genital opening. 



? = female genital opening. 



Plate XV. 



FIG. 



1. Longitudinal section. Enlarged ca. 5. 



2. Sketch of anatomy. 



3. Granule-gland, median longitudinal section. Obj. 3, Oc. 3. 



4. Chitinous processes round the ductus ejaculatorius. Obj. 5, Oc. 0. 



5. Spine of penis from a longitudinal section through the copulatory organ. 



Obj. 7, Oc. 3. 



6. Longitudinal section through the bursa copulatrix. Obi. 2, Oc. 0. 



7. Schematic representation of the copulatory apparatus. 



