ECLIPIDEILID^ AND THEIR ANATOMY. 



Explanation (»f tlie figures. 



PL I. 



Eclipidrilus frigidus n. sp. 



Fig. 1. The interior of the 6"* to 14 setisferous segments showing the sexual organs in 



situ. The female organs are colored red, the male blue. 



ov. = ovary. 



rs. = seminal receptacle (female). 



ovd = oviduct. 



efd = efferent duct. 



t. = testes. 



v.s := seminal vesicle of the efferent duct (male). 



The testes which are overlying the sexual organs are represented as pellucid, 



which in reality they are not. 

 Fig. 2. The front part of the worm showing the vascular system. The pulsating vessels 



are colored red, the non pulsating blue. 



D. v. = dorsal vessel. 



V. v. ^= ventral vessel. 



g. V. p. = primary gastric vessels. 



g. V. s. = secondary gastric vessels. 



p. V. = perigastric vessels. 



The setigerous segments are numbered 1 to 14. 

 Fig. .3. Some of the last segments of the body, showing the posterior part of the vas- 

 cular system. 



D. v. = dorsal vessel. 



V. v. = ventral vessel. 



p. V. f. = free perigastric vessel. 

 Fig. 4. Shematic view of tlie ventral side of the 8"" to ll"" setigerous segments showing 



the exterior orifices of the generative and segmental organs. 



r. s. = orifice of seminal receptacle. 



efd = » » efl'erent duct or sexual porus. 



ovd = orifice of oviduct. 



s. o. = » « segmental organ. 



sp. = spines. 

 Fig. 5. Two spines highly magnified. 

 Fig. 6. the oviduct, dito. 



Fig. 7. a. b. c. different kinds or aspects of spermatozoa-cysts. 



Nova Acta Reg. Soc. Sc. Ups. Ser. III. 2 



