130 DR. J. STEPHEXSON ON THE MORPHOLOGY, CLASSIFICATION, 



lined by a layer of cubical epithelium, modified as follows in 

 certain regions : — 



(1) The funnel — a long, rather curved groove on the posterior 

 wall, extending from the roof of the chamber downwards to the 

 beginning of the oviduct. The cells composing it ai-e high and 

 narrow, with much elongated nuclei situated above the ixiiddle of 

 the height of the cells ; the cytoplasm is granular ; the free 

 surface is bordered by a layer of rodlets (" Stiibchen "). 



(2) The ovary, on the anterior wall, consisting of a number of 

 finger-like lobes attached along an oblique area on each side of 

 the alimentary canal ; the upper portion of this area is quite 

 narrow, but it gradually widens below. 



(3) Various proliferations of small cells, with deeply staining 

 nuclei ; these constitute somewhat indefinite heaps which do not 

 seem to be on the way to develop into ova, since the characters 

 of the cells are the same at the periphery of the mass as deeply 

 in its substance. These masses occur on both anterior and pos- 

 terior walls (one is cut dorsal to the gut on the posterior wall of 

 the chamber in the figure), and also at various places within the 

 ovisacs. 



In another specimen the ovisac was largely filled by pinkish- 

 yellow (yolk) granules, amongst which nuclei were occasionally 

 seen, and a few of the small cells mentioned above. A thick 

 layer of the grains replaces the coat of prolifei^ating cells on the 

 inner surface of the wall of the ovisac. In the chamber and 

 ovisacs there may be numerous small yellow masses like those in 

 the testis sacs ; these frequently have a number of dark granules 

 within them. 



(6) The Sperinathecce. 



The spermathecal apparatus in the genus consists of a spherical 

 or ovoid ampulla, attached to the hinder surface of septum 7/8, 

 and communicating with the exterior by a long, coiling duct; the 

 duct leads downwards on the septum, and ends in an atrial 

 chamber which debouches to the exterior in the intersegmental 

 fissure. The atrium is the variable part of the apparatus ; it may 

 be of considerable size, and either simple in form, projecting to 

 one side or other of the septum where this joins the ventral 

 pai-ietes; or bifid, one horn projecting on one side and one on the 

 other side of the septum ; or it may be small — even invisible in 

 dissection, owing to its being embedded in the body-wall ; or 

 possibly, in some cases, it may be altogether absent. 



In the present species the ampulla consists of the usual coats. 

 The lining epithelium is shortly columnar over the vault of the 

 sac and away from the origin of the duct, and the nuclei are 

 round ; it is high, and may be very high, on the lower part of the 

 sac near the origin of the duct, and on the anterior wall, and the 

 nuclei are correspondingly elongated. All the cells are provided 

 with rather short cilia. Embedded in the much elongated 

 epithelium at one part of the wall was a quantity of bright yellow 



