108 WILLIAM BLAXLAND BENE AM. 



pairs of glandular-lookinp:, modified nephridia. /■,/,/■ (Esophageal regions, 

 separated by the three gizzards, g, g', g". h, h. The septa. /. The tubular 

 intestine, k. The sacculated intestine. 



Fig. 34. — The contents of tlie somites vi to xx after the removal of the 

 alimentary tract. (X 3.) a, a. The two pairs of spermathecse. b. The 

 ovary, c, c' . Vascular tufts, probably nephridia, attached to the body wall. 

 d, d'. The two pairs of prostates, e. The ventral nerve-cord. 



EiG. 35. — A group of tubules from one of the modified nephridia of somite 

 VI. a. The base from which the tubules arise, b, b. The capillary blood- 

 vessels with their dilatations on the tubules, c, c. The branched processes 

 springing from a. 



I'iG. 36. — The free extremity of one of the tubules of a modified uepliridium 

 from somite vi. a. Connective-tissue wall of the tubule, b. Capillary 

 blood-vessel in the wall. d. A dilatation of the blood-vessel. I. Lumen of 

 the tubule. 



Fig. 37. — A transverse section of a tubule of one of the modified nephridia. 

 a. A dilatation of one of the capillaries, b, b. Capillary blood-vessels, c. 

 Connective tissue forming the wall of the tubule, d. Perforated cell of the 

 nephridium. I. Intracellular lumen, n. Nucleus of perforated cell. 



Fig. 38. — A portion of one of the vascular tufts, indicated at c. in Fig. 34. 

 a. Connective tissue, b. blood-vessel. I. Intracellular lumen. 

 Fig. 39. — The ovary attached to the septum xi — xii. (X 10.) 

 Fig. 40. — A lobule of the ovary, with the blood-vessel, b, branching 

 amongst the coelomic epithelial cells, c, amongst which are the ova, a. 

 (Sli<ihtly diagrammatic.) 



Fig. 41. — A portion of a section through the prostate, near its external 

 aperture, a. Cuticular lining, b. Columnar epithelial cells, c. Muscular 

 coat. d. Membrane forming outer wall of prostate, e. Blood-vessels lying 

 in this coat, and branching amongst the epithelial cells. 



Fig. 42. — A portion of a section through the prostate near its free extremity. 

 a. Deep-lying, club-shaped granular cells, b. Columnar epithelial cells, e. 

 Blood-vessels ramifying amongst the club-shaped cells, d. A membrane 

 forming tlie external coat of the prostate. 



Fig. 43. — A portion of a transverse section through one of the intestinal 

 glands of Urobenus. a. Variuus-sized, oily-lookiug globules (? calcareous) 

 lying in the lumen of the tubules, b. Large blood-sinuses surrounding the 

 tubules, e. Epithelial cells lining the lumen. /. The lumen, m. Basement 

 membrane to the epithelium, forming the wall of the blood-sinus. 



