86 CALIFORNIA ACADKMV OK SCIENCES. 



very tliiii, lliirincr in I'iict tliaii any oilier [kuI of iIk! alimentary cuikiI. Of the Ualance 

 of tlii.s canal there is no distinction hetweeii uwophaj^iis and sacculated intestine. Tiie 

 gilt is every where sacculated, only increa-sing in thickness towards the genital somites, 

 where it is thickest. The alimentary canal throughout its length is lined hy a 

 columnar, ciliated epithelium, outside of which is a v(;ry thick va.scular layer, with 

 large blood lacunes, directly connected with the dorsal and ventral vessels, wiiich are 

 closely attached to, or almost imbedded in the intestine. The latter as well as the 

 vessels are covercti wllii chloragogic cells, which, especially in the region <jf the 

 dorsal vessel, are very large (tigs. 85 to 91), the layer l)eing thickest close to the 

 strands of mesenteric tissue connecting the intestine with body-wall. 



The free coiloraic lateral vessels in the eight anterior somites are similarly 

 surrounded by a thick mass of glandular cells, arranged around muscular .strands, and 

 which are quite distinct from the chloragogic cells and more resemble real glands. 

 Their reaction to stains is entirely distinct from that of the chloragogic cells of the 

 main ve.ssels and of the alimentary canal, staining very deeply with aramoniated 

 hicmatoxylon (fig. 84), and showing a coarser grainy secretion, while the real chlora- 

 gogic cells remain much more pellucid and contain much finer grains. Cells similar 

 to the former are also seen attached to the cffilomic covering of the pro.state (fig. 

 107, etc.) They also greatly resemble the glandular cells, or multicellular glands 

 from the pharyn.x of Pontodrilus and other oligochicta, possessing i)liaryngeal glands. 



The vascular layer of the intestine is very much developed, especially on the 

 ventral side, where it connects with the ventral vessel, through a thick band of mesen- 

 teric and connective ti.ssue. This as well as the walls of the blood vessels were so 

 thickly studded with a protozoa (Hjcmagregarina) that the structui-e of the layer 

 could not even in a single instance be properly made out. 



There are no pharyngeal glands, though a few glandular cells are seen scat- 

 tered about between the muscular strands connnecting the pharynx with the body- 

 wall, lint these cells resemble more chloragogen cells than true pharyngeal glands. 



The (entes arc of no unusual structure. The anterior pair, in the specimens I 

 opened, are smaller than the posterior pair, which were always forked, while the ante- 

 rior pair was undivided. 



The ODiirij in xi is always sigmoid of irregular shape and present the peculiarity 

 that seldom more than one ovum is developed at a time, this one being situated not at 

 the ])eriphery or at the free end of the ovary, but in the inner angle of the sinus. The 

 ovum is uiuisually small in si/(_' and readily detachcil I'ikui the gonad (figs. 78, 108). 

 It grows large after separation, and is found in numbers in the posterior somites. 



The ornnj is of large size reaching far ijuck to tiie posterior septum. Its lower 

 end is not oidy attached to the se[)tum and body-wall, but also to the narrow end of 

 the outer sperm funnel (or ciliated rosette) fig. OG. In one of the specimens sectioned 

 the <jvaries either extended past the ovidiicl through somite xii, or there wsis a second 

 pair of ovaries in xii. Heddard has similarly remarked liiat the ovary in Sutroa is 

 attached to the cells of -the spermidiu-al ftinn(d. 



