Dr. W. Micliaelsen on the Enchjtrajidce. 425 



Lymph-corpuscles as shown in fig. 4 h. The salivary glands 

 are still more reduced than those of B. appendiculata, stumpy, 

 about six times as long as broad. The intestinal diverticulum 

 (fig. 4 c) differs only in unimportant points from that of B. 

 appendiculata (see Q, pp. 299, 300, figs. 7-9). I describe 

 it below. The very narrow oesophagus at its passage into 

 the wide stomachal part is somewhat invaginated in the latter, 

 so that dorsally a broad pouch of no great depth is produced. 

 From the bottomof this pouch proceed thin, sparingly branched, 

 cffical tubes (1 believe I have seen more than two of them), 

 which are brought together into a rounded convolution. The 

 thickness of the tubes is not so uniform as in B. appendicu- 

 lata, nor are they so closely squeezed together as in that 

 worm. The membrane of the intestinal blood-sinus passes 

 on to the intestinal diverticulum, surrounds it, and is con- 

 tinued forward directly into the wall of the dorsal vessel. In 

 B.fallax the intestinal diverticulum is firmly attached to the 

 oesophagus, and even half embraces it. A median longitu- 

 dinal constriction, such as occurs in B. appiendicidata, is 

 entirely deficient. The cerebrum of our worm is emarginate 

 before and behind, much longer than broad, with the lateral 

 margins anteriorly convergent (fig. 4 c?). I'he segmental 

 organs consist of a small stumpy anteseptale and a flat, irre- 

 gularly oval postseptale, with a rather short efferent duct. 



The sexual organs show the arrangement normal in the 

 Enchytrgeidse. The seminal funnels are irregularly cylin- 

 drical, excentrically perforated, about three times as long as 

 broad, with a widely everted margin. The seminal canals 

 are long, and regularly packed together, very much in the 

 way that ships' cables are laid together. The oviducts are 

 like those of other Enchytrseidfe. The seminal pouches are 

 very elegant (fig. 4e). The efferent duct is simple, rather 

 long, with two pyriform glands at the orifice. The main 

 portion is reversed-pyriform (with the broad pole turned 

 towards the aperture), and communicates at the apex with 

 the intestine. By depression and subsequent overgrowth 

 there is produced in the wall of the main portion an annular 

 canal, which is connected with the actual lumen of the part 

 only by narrow fissures. This canal is destined for the recep- 

 tion of the semen ; it is homologous with the side-pouches of 

 the seminal sacs of Enchytrceus hegemon and other Enchy- 

 trgeidse. I have never found semen in the actual lumen of the 

 main portion. 



I will further mention that in one animal I found a con- 

 necting duct between two consecutive segmental organs^ an 

 abnormity such as Yejdovsky describes (8) in an Anachceta 

 Ann. (& Mag. N. Hist. Ser. 5. Vol xx, ijQ 



