190 CALIFORNIA ACADEMY OF SCIENCES. 



PLATE LIII. 



ACANTHODBILUS TAMAJUSI. 



96. A somewhat diagrammatic view composed Irom several longitadinal sectious of the body. r. m. retractor mus- 



cles of gizzard, c. c. masses of free erelomic cells. 



SPARGANOPHILUS BENHAMI. 



97. Adult specimen, natural size. 



98. The iiuterior somites, ventral view, iucludiuf; clitellum, tnberciila pubfrtntis, etc., magnified fonr times. 



99. Longitudinal section of the anterior somites passing through the spermathecal and prostate pores, composed 



from several sections. Somites lix-xxii are not figured, sep. gl. septal glands which open in the dorsal part 

 of the pharynx. /. sep. gl. lower septal glands which open in the ventral part of the pharynx. The spernia- 

 thecic have been cut through diagonally and the figure does not give any idea of their real shape. 



101. Section of the body-wall in ventral part of somite xii. p. peritoneum, n. ep. nuclei of supporting cells. 



102. Longitudinal section of the clitellum. 1. Supporting cells. 2. Unicellular glands. 3. Short clitellar cells, 



staining deeply, and furnished with perfect nuclei, /f. Largest clitellar cells, staining less deeply and with 

 imperfect nuclei. Zeiss D. 



103. -V part of the same section, more magnified. Iron, h.i>matoxyliu, Haidtuheiu, Ehrlith 3 acid. Numerals indi- 



cate the same as iu fig. 102. d. n. degenerate nuclei of the 4 cells, n. mc. cell plasma around the nuclei 

 pushed far back in the apical part of the cell. n. sh. c. nuclei of the short clitellar cells surrounded by cell 

 plasma and mucin, c. t. connective tissue, hi. r. blood capillaries which are very scarce in the clitellum of 

 this species. 



104. Section of the body wall iu somite xiv. 



105. Cross-section through clitellum and tubercula pubertatis. /. Supporting cells. 2. Unicellular glands. S. 



Shorter clitellar cells staining darkly. ,>. The longer clitellar cells. 5. tpc. tubercula pubertatis 

 cells, largest kind. A few of these are seen to contain free but shrunken nuclei. '<'. tpc. tubercula puber- 

 tatis cells of the narrow kind, with cell plasma in the apical end, but also with shrunken nuclei. I. p. tuber- 

 cula pubertatis groove, n. f. nerve fibers, cl. c. J. large unicellular glands, a large form of the usual uni- 

 cellular epidermal glands. Above these is seen a wide lumen, probably a blood vessel. 



100. Longitudinal section of the body-wall, through spermatheca. 



107. Longitudinal section of body-wall through prostate and pore in somite xxiv. t. c. tubular supporting cells. 



g. (-. glandular cells confined to the zone around the intersegmental grooves. 



108. The same as 107, more magnified. 



II)!). The inner whorl of the ciliated rosette. 



110. Section through the oisophagus. i". c. interstitial cells. 3/. interstitial glands. 



HI. Section through intestine in somite xii. Hhr. blood crystals and fibrine. 10. bl. u\ wall of blood sinus. 



11'2. Section through upper pharyngeal wall, showing epithelial rells, and between them the discharge tubes of the 



glands. Zeiss 12, horn. im. 

 11:!, Section through the same part, showing a three-forked duct. 



1 1 1. Section through the iulostiual wall, next posterior to the real pharynx, showing larger discharge tubes and 

 chambers. 



1 \'y. Section through ventral wall of pharynx, with ducts and storage chambei-s of glands, and between them shorter 



epithelial cells, to. and d. muscles along which run the ducts, n. d. nuclei of ducts. 

 110. Surface view of one of the larger blood vessels. 



117. Outline of one of the uephridia. 



118. Outline of a spermatheca. 



