98 
20. 
28. 
CALIFORNIA ACADEMY OF SCIENCES. 
PLATE XXXII. 
PH@NICODRILUS TASTE. 
Longitudinal section of the alimentary canal (esophagus), in vi. ep. inner lining epithelium. g/. glandular 
cells. 61. blood sinus. m. the two muscular layers. pt. peritoneal epithelium. 
Longitudinal section of the pharynx, showing the glandular ducts and ductules penetrating the pharyngeal 
epithelium. cl. ciliated surface. n. ep. nuclei of epithelium. dus. ductules. duct. large duct from the 
pharyngeal glands above the cesophagus. . ep. casophageal epithelium joining the pharyngeal ciliated 
epithelium. 
Section of the body through one of the clitellar somites, a diagrammatic view, to show the relative size of the 
different layers of the body-wall. d.v. dorsal vessel. s.i. saculated intestine. m. /. the muscular layers. 
cl. c. clitellar cells. sp. d. spermducts. v.v and 7. c. ventral vessel and nerve cord. 
A diagrammatic section of the body in somite ix showing the relative size, etc., of the diverticula and the 
layers of the body-wall. d.v. dorsal vessel. sp. s. sperm-sacs in somites ix and x. div. diverticula of the 
intestine. v.v. ventral vessel. mn. c. nerve cord. 
Section of body-wall of a non-clitellar somite. g.c. unicellular glands. s. c. supporting cells. ¢. m. trans- 
verse muscular layer. /. m. longitudinal muscular layer. pr. peritoneum. 
KERRIA McDONALDI. 
Nephridium of Kerria McDonaldi from one of the somites closely posterior to the clitellum. pr. s. peritoneal 
sac with nuclei. The posterior end of this sac is not furnished with blood capillaries. c. b/. capillary blood 
vessels, spreading principally through the peritoneal sac. a./. anterior lobe. p./. posterior lobe. nephr. st. 
nephrostome. nephr. pr. nephropore. w.d. wide duct outlet. m. d. narrow dyet. nec. neck of the 
nephridium. 67. bridge. spr. spur. s. septum. 
PONTODRILUS MICHAELSENT. 
A specimen, natural size, having been slowly killed and extended. One of the largest specimens, the majority 
being only one-half as large. 
The three anterior somites seen from the side. pr. prostomium. per. peristomium. 
The anterior part of the worm more highly magnified, ventral view. cl. clitellum. ¢ male pore. spth. p. 
spermathecal pores. ov. p. ovipore. c. pr. m. cushion where ends the fan-shaped fascicle of prostate or arci- 
form muscles. c.c¢. exterior copulatory cushion. 
Part of the body-wall iaid open and spread out to show the relative distances of the sete, the numerals 
indicating the number of the seta. The ventral nerve cord is indicated. 
One of the setee highly magnified. 
