NEMERTEANS. • 105 



A single complete specimen was obtained measuring 22 cm. in length, and with an 

 average breadth of 35 mm. In external appearance much wrinkled and somewhat flattened. 

 There is a well-marked circular head furrow. On the dorsal surface there is a veiy pale 

 brown stripe about I of the body- width. A similar stripe occurs also on the ventral 

 surface. 



The skin is fashioned in the style characteristic for the genus. The closely packed 

 layer of cutis glands is about three times the thickness of the epithelium. The connective 

 tissue layer of the cutis is rather thicker than the glandular layer. 



The circular muscle layer in the oesophageal region is rather thicker than the inner 

 longitudinal layer. The outer longitudinal layer is stouter than the other two together. 



The vascular system in the snout region forms a distinct cephalic loop, though the vessels 

 are very wide and separated only by a thin partition. This loop lies dorsal to the rhyn- 

 chodaeum, i.e. in the same position as the anastomosing lacunae of other species of Eupolia. 

 In other respects the vascular system shews no peculiarities marking it off from the usual 

 arrangement such as that found in E. curta. 



The alimentary canal shews no marked peculiarities. 



The proboscis is peculiar in possessing only one layer of muscle fibres, i.e. a longitudinal 

 layer. The epithelium is comparatively low. 



The excretory system starts about 4 mm. from the tip of the snout. It lies entirely at 

 or below the level of the line joining the nervous side stems. It extends over about 5 mm. 

 It possesses no ducts to the exterior nor any traces of such structures. Fine cords of cells 

 however, which have almost the appearance of delicate ducts compressed to obscure the 

 lumen, pierce the glandular layer of the oesophagus (PI. IV. fig. 14) and may be traced 

 to the oesophageal epithelium. Such an arrangement recalls the peculiar condition found 

 in Eupolia melanogramma\ though the communications differ probably from this latter species 

 in not being functional. 



The brain is much flattened in shape (PI. IV. fig. 8), its breadth being about three times 

 as great as its depth. The dorsal commissure is thick, straight, and short. The dorsal ganglion 

 lies more lateral than dorsal to the ventral ganglion. 



The cerebral organ is not large and is considerably flattened. The ciliated canal passes 

 straight to the inner border of the organ where it dilates into a large spherical vesicle 

 with high epithelium containing a few gland cells (PL IV. fig. 12). A small quantity of 

 glandular secretion also occurs within this expansion of the ciliated canal. The dorsal lobe 

 of the dorsal ganglion reaches some way over the cerebral organ. The opening of the cerebral 

 organ is lateral and slightly ventral (PI. IV. fig. 8). The ciliated canal in this position opens 

 into the circular head furrow, and the circular head furrow in this species is peculiar in being 

 marked by a number of small longitudinal furrows which extend entirely round it (PI. IV. 

 fig. 8). The epithelium of these small head furrows is characterised by an absence of epithelial 

 glands and by the numerous closely packed oval nuclei (PI. IV. fig. 13). Along the summits 

 of these small ridges occur small refractive bodies which do not stain. Such head furrows 

 are peculiar to this species of Eupolia so far as is known, and recall the small head furrows 

 found in a similar position in the genus Drepanophorus (" Kopfgriibcheu "). 



' Punnett, Quart. Jouni. Mic. Sc, vol. 44, p. 116. 

 G. 14 



