TWO NKW BRITISH NEMKHTI']ANS. 563 



EXPLANATION OF PLATES 39 and 40, 



Illustrating Mr. Puuuett's paper on " Two New British 

 Nemerteans." 



Abbreviations in Plates. 



a. Aims. b.c. Buccal commissure, h.m. Basement membrane, c. Cutis. 



c. c. Ciliated canal of cerebral organ, cer. Cerebrum, c. org. Cerebral 

 organ. <r. o?y. ^/. Glands of cerebral organ, c. if. Connective tissue, cii ffl. 

 Cutis glands, d.b.v. Dorsal blood-vessel, d. c. Dorsal commissure of brain. 



d. g. Dorsal ganglion, e. p. Epithelium, ex. d. Excretory duct. e.r. p. 

 Excretory pore. ex. t. Excretory tubules, g. Gonad, h. s. Head slit. 

 i. d. Intestinal diverticulum. /. b. I. Lateral blood lacuna, /. b. v. Lateral 

 blood-vessel. w. c. Circular muscle layer of body-wall. m. c.c. Circular 

 muscles of cutis, m.c.p. Circular muscle layer of proboscis, m. cr. Muscle 

 cross, m.d.v. Dorso-ventral muscles, m. I. i. Inner longitudinal layer of 

 body-wall, m.l.i.p. Inner longitudinal muscles of ])roboscis. m.l.o. Outer 

 longitudinal muscles of body-wall. m. I. o. p. Outer longitudinal muscles of 

 proboscis. «. c. Lateral side stem. w. d. Median dorsal nerve, n. I. 

 Nervous layer, n. p. Proboscis nerve, o. d. v. Superior median dorsal 

 nerve (in Oxypolia). m. (Esophagus, oes. e. (Esophageal epithelium. 

 ces. I. (Eso|)liageal lacunae, p. ep. Proboscidial epithelium, r. Rhynclio- 

 dseum. r. ep. RiiyncliocoRlomic epithelium. rhc. p. Rhyuchoccelomic 

 pocket, s.o. Side organ, v.g. Ventral ganglion, v.v.c. Veutrcd vascular 

 commissure. 



EiG. L — Micrella rufa. Transverse section through the oesophageal 



region just behind the termination of the excretory tubules, x "15. 



I^IG. 2. — M. rufa. Transverse section through the level of the side organ. 

 X 45, 



Fk;. 3.— M. rufa. Transverse section through the level of the anus. 

 X SO. 



Fig, 4. — M. rufa. Transverse section through the [yroboscis about the 

 middle, X 160. 



Fig. 5. — M. rufa. Side view of anterior end of the animal after preserva- 

 tion. X 2. 



Fig. 6. — M. rufa. Section through the side organ. X 160. 



Fig. 7.— M. rufa. Section through outer portion of ventral body- wall in 

 oesophageal region. X 160. 



