60 CALIFOKXIA ACADEMY OK SCIENCES. 



fi.'J. Inner part of ui'phriilinni nicire liij^lily ma-fniliiil. Tlu' niiuicrals inrlicuti' the snmc plaecs mi iu Fig. 59. The 

 letters are the same as in the above tignre. 



K4. Part of the same more highly magnified in oriler to show tlie eapiUaries and their ooniiection with the inner 

 duet of the tulic. l.f. tul)e leading to nepliridio-stonie. «. npper eaiial. h. lower<^inal. i. /. iuuerlumen 

 of the duct which connects at c. with the capillaries, r.l. capillary tulies, longitudinal view. r.t.r. capil- 

 lary tubes seeu iu cross-sectiou. kji.c. spongy canal or tube directly connecting with the duct 1 aud con- 

 taining the cnpillaricK. o. c. outer caual leading to the uephridio-pore. c. hr. the narrow bridge conueetiug 

 the two main folds. /». c. point where ciliatiou begins. ht. r. blood-vcsgols, connecting with capillary 

 blood-vessels surrounding the two inner canals a and A .• only a part of the blood-vessels are drawn. This 

 figure was carefully drawn with camera lucida, though, on account of the minuteness and numbers of the 

 ductules c. Ic. and <•. t., it was impossible to delineate all, almost one-lifth having been left out in places where 

 they crowded each other. 



<).">. View of the spongy dnct between 3 aud 4 showing the inner canals a aud /< aud the connectiug dnctules; 

 letters indicate the same as iu previous ligures. 



(iti. The same spongy duct near 4, end view, aud partly cross sectiou. 



(i7. The posterior fold as seen at 5, the crosses -|- and X indicate the respective point corresponding on lig. .'>», 

 in order to show the direction of the tube, which is contrary to the one shown on hg. 59. k/k t. the spongy 

 tube with the upper aud lower ducts, connected by ductules r. (. hi. bloodvessels, rap. capillary blood- 

 vessels, some of which surround the inner (canals, others the outer fold. At the place marked with a X the 

 ductules begin to connect the upper spongy tube with the lower nuiin canal instead of with the lower part 

 of the s])ongy tube, as at r. I. 



68. A somewhat larger figure of the last taken at the eml X, where the lower part of the spongy tube has almost 

 vanished and become bereft of its tubules c I., capillary tubes entering caual b. r. chambers on the central 

 caual in the spongy tube, which send off tubules on the other side of the two maiu canals, and which also 

 enter the caual. h. I. lumen of the spongy tube. In this aud the previous figure will be seeu how the tubules 

 of the spongy t\ibe shown in figs. 6.'5 aud 66 have been found forming a more regular lumeu /, which in the 

 next figure will be seeu to emerge into or change to a regular caual. 



(i!l. I'art of the upper fold at 7, showing the tubules of the spongy tube to cease, the tube itself to become more 

 regular, fusing itself in caual h. The arrows show the direction of the fluid or excretions from the uepridio- 

 stouie to the pore. 



70. Di.igramatic sectiou of the uiaiu fold at the place where the capillaries of the spongy mass have ceased, and at 



the very point of the outer ban I marked fig. 59 o. c.f. The spougy mass surrounding the cauals is now void 

 of tubules. 



71. View of the anterior fold at 10, showing the inner ciliated canal — formerly the lumen of the spongy tube — 



and the two canals a and h, which are enclosed by a common glandular mass, a continuation of the spongy 

 tube. The lower fan-shaped lines are possibly openings or valves iu the tube, connecting with the glandular 

 mass. As will be seen, the glandular mass is not contiuuous, but seemingly separated by lumeus — I — which 

 may prove to be canals connecting with the tube at the slits above referred to. 



7'2. .V part of same fold between 9 and 10. Tlie lumeu is here void of cilia, aud the glaudiilous niass is smaller 



73. The main fold as seen at the narrow place 9. I- lumeu void of cilia, a. oue of the canals a or li seen ou the 

 other side of the lumon. 6/. v. bloodvessels surrounding the lumen aud its glandular walls. 



74A. Cross sectiou of the posterior maiu fold taken at 3, before the maiu central lumen in the spougy duct was 

 formed. 



74B. Cross section of the posterior duct at 7, showing the bliud ending of the tubules. 



7"). A longitudinal section of the fold at 5, showing only oue of the central canals. 



76. The same, the under side of the lumen being iu focus. 



77. A longitudinal section near 3; here also oue of the canals has been cut away. 



78. Peritoneal cells of the ncphridial supporting covering from /). c. fig. 59. 



79. The same, end view. /». c. masses of jierigastric cells, 

 so. One of the perigastric cells more highly magnified. 



81. One of the spormathecip, exterior view. 



82. Cro88 section of a spermatheca. <i. upper sac like part. I>. lower muscular part. m. muscular layer of the 



sac-like part. I. m. longitudinal muscular layer of the body-wall. c. /«. circular muscular layer of the 

 si)ermatheca. ijl. ep. glandular e]iithclium. i. inner cavity of the spermatheeji. s/j. A. sperm balls. I. h. 

 lacuuary system, or chambers for the storage of the spermatozoa. «. m. secreted mass with streaks of sperm- 

 atozoa, n/iz. spermatozoa. I. m. trausvei'se muscular layer of the body-wall. H/tlh. ji. spernuilhecal-pore. 



83. A longitudinal section of the spcrnuitheca nuiro highly magnified, showing the lacuuary system aud its position 



to the epithelial cells. Letters as in the last figure. 



84. Cross soetiou of the muscular part of the spermatheca, showing the arrnngcnient of the storage chambers oc- 



cupied by sperm balls. Letters as in fig. 8.'}. 



