a6o 



DISCOVERY REPORTS 



Fig. 33. Amphiporus lecointei, Burger. A, dorsal, and 

 B, ventral sides of the head. 



it ventrally there are several furrows passing forward upon the head (Fig. 33 B). The 

 opening of the head gland can sometimes be seen at the tip of the head : the larger 

 opening of the rhynchodaeum is subterminal. 



There is a semi-lunar group of about twenty deeply embedded eyespots showing 

 palely through the skin passing outwards on each side from the tip of the head along the 

 margin and turning medially. Follow- 

 ing these eyespots there is a deep 

 closely-set posterior group of eyes 

 behind the cephalic furrow of each 

 side (Fig. 33 A). 



The distinctive marking of the 

 species is a broad brownish red band 

 down the back extending on to the 

 head. The edges of the body and the 

 underside are uncoloured. 



Form and colour of preserved speci- 

 mens. The stout body does not twist 

 much. Often the ventral side is more 

 convex than the dorsal and there is a 



tendency for the body to curl with the dorsal surface inside. Occasionally the ventral 

 surface is flat or concave while the dorsal is humped. The proboscis is usually pro- 

 truded. It is nearly the same length as the body. The colour can in some specimens 

 be traced as a grey band. The eyespots are large. On clearing, the anterior group can 

 be seen to consist of 10-20 on each side opening forward, the posterior of 16-18 opening 

 laterally or posteriorly. 



Anatomy. The basement membrane stains somewhat with haematoxylin and is 

 nearly as thick as the epithelium, which is itself 

 very thick. Each of these layers is four to five 

 times as thick as the circular muscles. The longi- 

 tudinal muscles are thick and show a marked 

 pennate arrangement of the bundles (cf. A. 

 marioni, Hubrecht). There are subepithelial 

 glands in the head confined to lateral tracts from 

 the tip to just beyond the cerebral canals. These 

 I propose to call cerebral subepithelial glands. 

 They differ in appearance and staining reaction 

 from the head glands and their ducts can be 

 seen traversing the body layers direct to the 

 exterior (Fig. 34). The head glands just reach the 

 brain. They are compact strands opening by a 

 median pore at the tip of the head. 



The proboscis is thin and is attached at about 



Fig. 34. Amphiporus lecointei, Burger. Trans- 

 verse section of the tip of the head, bm, base- 

 ment layer; cc, cerebral canal; cm, circular 

 muscle layer; csg, cerebral subepithelial 

 glands; e, eye; ep, epithelium; Im, longi- 

 tudinal muscle layer; rd, rhynchodaeum. 



