234 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



diverticles, on either side, to the intestine. This entrance 

 is situated on the dorsal side of the intestine, just below 

 the septum XV/XVI. But the connection between the 

 diverticles on each side is not such as is figured by Bed- 

 dard in his Microdrilus salie?is. There we see that the 

 connection is high up and the posterior diverticle appears 

 to be merely a fold or projection of the middle one. In 

 Dichogaster Crawi the posterior diverticle is connected 

 with the main duct by a long duct which runs parallel to the 

 intestinal wall. The anterior pair of diverticles is in reality 

 only lobes of the second pair, and only slightly set off from 

 it. The posterior pair is well set off from the middle pair. 



Sexual A-p^aratus. — (figs. 89, 94.) As far as can be 

 judged from Beddard's descriptions, these organs resemble 

 those of Microdrilus saliens. The two pairs of spermathecas 

 are of toadstool shape, each with a short diverticle pointing 

 forwards. The ciliated sperm-funnels are short, compact, 

 and not folded, much the same as in Benhamia. The sperm- 

 sacs are small, racemose, and postseptal in XI and XII. 

 The ovaries in XIII are just inside of the clitellum. There 

 are two ovisacs protruding from the septum XIII/XIV into 

 XIV. 



The sperm-ducts are separate till they reach the pore. 

 With the commencement of somite XV they are compara- 

 tively narrow, but in that somite their muscular layer begins 

 to widen and at the end of it is more than twice as thick as 

 in XIV. From somite XIV to the pore the combined ducts 

 are of even thickness, and as wide as the muscular duct of 

 the prostate. The sperm-duct at this point is as thick as 

 the two muscular layers of the body-wall combined. It lies 

 entirely free and on the top of the coelomic epithelium. 



The prostate is tubular and confined to one somite, XVII. 

 The muscular part is quite long. The glandular part is 

 tubular and consists of two layers of cells. The papilla on 

 which the pores are situated is strongly convex, but hardly 

 extends above the line of the general body-wall. The 

 prostate opens in the centre of the papilla, and the sperm- 

 duct immediately behind in the posterior part of the pore. 



