ON THE ANATOMY OP ALLURUS TETRAEDRUS. 371 



EXPLANATION OF PLATE XXV, 



Illustrating Mr. Prank E. Beddard's paper " On the Anatomy 

 of Allurus tetraedrus, Eisen." 



Fig. 1. — Allurus sp., lateral view of anterior segments. ? oviducal pore. 

 (J. Pore of vas deferens, sp. Spermathecal pore. d. Clitellum. n. Nephridipores. 



Fig. 2. — Dissection of genital region of one side of the body. v. s. Seminal 

 reservoirs, t. Testes, v. d. Funnels of vasa deferentia . ov. Ovary, od. Oviduct. 

 r. o. Receptaculum ovorum. ca. Calciferous glands, p. Glandular fold of in- 

 tegument. 



Fig. 3. — Elongated seta (a) from Segment 8 compared with one of the 

 ordinary setae (b). 



Fig. 4. — Section through body wall of 8th Segment, to show the rudimen- 

 tary spermatheca (c. p.). 



Fig. 5. — Section through part of Segment 13. v. d. Vas deferens, cl. 

 Mass of glandular cells. ov. Ovary. od. Oviduct, r. o. Receptaculum 

 ovorum. 



Figs. 6 and 7. — Isolated glandular cells from region marked cl. in last 

 figure. 



Fig, 8. — Part of a transverse section through one of clitellar segments. 

 *. Setae of ventral pair. n. Nephridium, showing external aperture, p. Mass 

 of glandular tissue. 



Fig. 9. — Longitudinal section through gizzard, m. Longitudinal muscles. 

 t. Transverse muscles, e. Epithelium, c. Internal cuticular lining, bl. These 

 spaces were in many sections filled with blood. 



Fig. 2 a. — Transverse section through oesophagus and calciferous glands. 



Fig. 10. — Longitudinal section (diagrammatic) through anterior segments, 

 to show position of cerebral ganglia, b. Buccal cavity, ph. Pharynx. 



Fig. 11. — Transverse section through nephridial tubule, p. Peritoneal 

 cells. 71'. Drain-pipe cell, perforating, n., another cell. 



Fig. 12. — Longitudinal section, similar to preceding. 



