ON THE STRUCTURE OP VERMIOULUS PILOSUS. 265 



EXPLANATION OF PLATES 26—28, 



Illustrating Mr. E. S. Goodrich's paper, ^' On the Structure of 

 Vermiculus pilosus." 



List of Reference Letters. 



a. sp. s. Anterior sperm-sac. b. n. Main body of the nephridium. 6r. 

 Brain, d. v. Blood-vessel, b. w. Body-wall. c. Cuticle, c. a. Ciliated 

 ampulla, c. c. Coelomic corpuscle, c. ep. Coelomic epithelium, c. ext. Canal 

 to the exterior, ci. Cilia, cl. Clitellum. c. m. Circular muscles, c. n. Cell 

 of the nephridium. c. p. Ciliated process, coel. Ccelom. d. v. Dorsal longi- 

 tudinal vessel, ep. Epidermis, ep. cl. Epidermis of clitellum. ep. spth. In- 

 ternal lining of the spermatheca. ex. ci. External cilia. /. Flame-like cilia. 

 g. c. Ganglionic cell. int. Intestine. I. d. s. Left dorsal bundle of setas. 

 I. d. V. Lateral dorsal vessel. /. /. Lateral line. I. m. Longitudinal muscles. 

 I. V. s. Left ventral bundle of setae. I. v. v. Lateral ventral vessel, m. Mouth. 

 m. I. V. V. Middle lateral ventral vessel, m. n. c. Muscles on the nerve-cord. 

 f». n. c. I. Lateral strand of muscles. ?«. n. c. m. Median strand of muscles. 

 m. p. sp. Median pore of the spermiducal chamber, m. s. Muscles of the 

 septum, n. c. Nerve-cord. n.f. Nephridiostome. nph. c. Nephridial canal. 

 nph.p. Nephridiopore. ces. Oesophagus, ov. Ovary, ovd. Oviduct, ovs. 

 Ovisac, pel. Palpocil or sense-hair. p. I. v. v. posterior lateral ventral vessel. 

 ph. Pharynx, pr. Prostomium. p. s. c. Post-septal canal, p. s. m. Post- 

 septal mass. p. sp. s. Posterior sperm-sac. r. v. s. Right ventral body of 

 setae, sei. Seta. sept. Septum, sp. p. Spermiducal pore. sp. ch. Median 

 spermiducal chamber, sp.f. Spermiducal funnel, spth. Spermatheca. spth. 

 p. Spermathecal pore. t. Testis, v. "Valve, v. ov. Vessel to ovisac, v. v. 

 Ventral longitudinal vessel, w. of sp. Wall of sperm-duct. w. of v. Wall of 

 blood-vessel. 



Fig. 1. — Adult Vermiculus pilosus, dravpn natural size. 



Fig. 2. — View of the anterior part of the body, slightly twisted so as to 

 display the dorsal and ventral setae and the median genital apertures. 



Fig. 3. — Enlarged view of a seta. Z. apoch. 4 mm., oc. 4, camera. 



Fig. 4. — Small portion of the body-wall, drawn from the living to show the 

 covering of hair-like processes. Z. apoch. 4 mm., oc. 4. 



Fig. 5. — Semi-diagrammatic view of the vascular system from the dorsal 

 surface ; from the living. 



Fig. 6. — View of the brain and anterior part of the alimentary canal ; from 

 the living. 



