162 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



fra den naturh. Foren. i Kjobenhavn, 1879, pp. 1 — 

 42, Tab. III.) 



11. Schmidt, Ferdinand. GraffiUa braunii, n. sp. Ar- 



cliiv. far Naturgesch., 1886. Bel. I. 



12. Verrill. Trans. Connecticut Acad., vol. VIII., p. 

 467, 1892. 



Explanation of Plates. 

 Plate V. 



Fig. 1. Penis of Mesostoma Jteapolitanum, v. Graff. 

 v.s., seminal vesicle; cJi., cbitinous tube which 

 projects into the spacious atrium. 



Fig. 2. Anterior end of variety of Monotus leneatus (0. 

 F. M.), with greatly reduced eye spot. e., 

 eye; at., otolith; g., gut; t.c, tactile cilia on 

 anterior margin. 



Fig. 3. GraffiUa buccincola, n. sp., from a pressure 

 preparation, the male organs are developed in 

 this individual, ep., epidermis; pJi., pharynx- 

 e., eye; sjjI., salivary (?) glands; g., gut; te., 

 testis; v.s., seminal vesicle; pe., penis. 



Fig. 4. Anterior end of an individual in which the 

 female elements are developed. ger., germ 

 gland; y., yolk gland, which is not figured on 

 the right side of the sketch; at., atrium; r.s., 

 receptaculum seminis ; other letters as in 



fig. 3. 

 Fig. 5. Pigment spots, composed of groups of granules, 



from the subcutaneous parenchyma of G. 



buccinicola. 

 Fig. 6. Four sketches, to illustrate the variations in form, 



of G. buccinicola. a. and b., examples in the 



