THE MARINE TURBELLARIA. 



311 



EXPLANATION OF PLATES. 



(? = male aperture. pe 



2 = female aperture. pi 



a.d. = accessory duct. pr 



a.m. = antrum masculinum. p.r. 



a.v. = accessory vesicle. p.m. ■ 



b.c. = bursa copulatrix. p.s. 



c = chitinous stylet. r 



c.d. — common duct. r.m. 



c.e. = columnar epithelium. rh 



c.h. = chitinous hooks. s 



c.r. = chitinous ring. s.ff. 



c.s. = chitinous spines. s.p. 



d = gut-diverticulum (of Planocera armata). u 



d.e. = ductus ejaculatorius. u.g. 



e.t. = tentacle-eyes. u.v. 



h = hyaline layer. va 



hy = hyaline secretory bodies. v.s. 



n = nervous tissue ves.d. 



o.s. = outer sheath. y 



p = pigment. x 



p.g. = pigment granules. 



p.m,. = pigment mass. 



; penis. 



: fold of lining wall of the penis. 

 ; prostate gland. 

 : pseudorhabdites. 

 intrinsic muscles of the penis. 

 ; penis sheath. 



: rod-like bodies or bacteria. 

 ■ retractor muscles. 

 : rhabdites. 

 : secretion. 

 : shell-glands 

 = dark secretory bodies. 

 : uterus wall. 

 = glands on the uterus. 

 = uterine vesicle. 

 = vagina. 



= vesicula seminalis. 

 = duct from the uterine vesicle. 

 = cells resembling yolk-glands. 

 = 'plug-like' tissue at the tip of a dorsal 

 papilla. 



PLATE XIV. 



Fig. 1. Planocera lanyii n. sp. 



Fig. 2. Prosthiostomum cooperi n. sp. Anterior third of adult specimen. 



Fig. 3. Pseudoceros tigrinus n. sp. 



Fig. 4. Pseudoceros gardineri n. sp. Tentacles, eye-spots of the dorsal surface and part of the 

 anterior margin. 



Fig. 5. Pseudoceros punctatus n. sp. for comparison with the preceding species. 



Fig. 6. Pericelis byerleyana n. sp. 



Fig. 7. Thysanozoon plehni n. sp. 



Fig. 8. Prosthiostomum elegans n. sp. 



Fig. 9. Leptoplana pardalis n. sp. 



G. 40 



