8 W. T. OALMAN. 



chamber, forming what Maurice calls a ^' pavilion anale," but 

 I have failed to find an anal sphincter, though such in all 

 probability exists. 



The intestinal gland is veell developed. A series of tubules 

 ramifies over the surface of the intestine (PL 2, fig. 24) ; 

 these are lined by somewhat irregular cells, and unite to form 

 a duct which crosses the intestinal loop to open into the 

 stomach at about its middle (PI. 2, fig. 23). 



Nervous System. — The nerve-ganglion is oval in form, 

 and gives off numerous nerves. Two large nerves in front 

 and a large median nerve (the cloacal), flanked by two smaller 

 lateral ones behind, are easily seen ; but it was found impossible 

 to determine the number or arrangement of the smaller lateral 

 nerves. 



On the dorsal wall of the dorsal blood-sinus a slight thicken- 

 ing composed of a few small cells (PI. 2, fig. 22) represents 

 the *' cordon visceral ganglionnaire" of van Beneden and 

 Julin, the remains of the central nervous axis of the larva. In 

 a fortunate series of sections this cord can be traced into con- 

 nection with the cerebral ganglion, which it enters at the root 

 of the cloacal nerve. 



In minute structure the ganglion corresponds exactly with 

 that of Fragaroides (PI. 2, fig. 21). Outside is a layer 

 of large nerve-cells, finely granular and with conspicuous 

 nuclei, sending processes inwards — the "grey matter" of Julin, — 

 while the interior is composed of the usual fibrillated " punkt- 

 substanz" — the "white matter" of Julin. 



Subneural Gland.— The subneural gland (PI. 2, fig. 21) 

 is very feebly developed, consisting merely of a thin layer of 

 cells lying on the posterior face of the nerve-ganglion, separated 

 from it in the middle line by a space representing the back- 

 ward continuation of the duct. The tissue of the gland con- 

 sists of ill-defined rounded cells, many of them containing 

 vacuoles. 



The duct, on the other hand, is well developed and normal 

 in structure. As in Fragaroides, its anterior wall is con- 

 tinued back over the posterior face of the ganglion for some 



