106 R. C. PUNNETT. 



Numerous small eyes occur on the dorsal surface of the snout. They lie for the most 

 part in the cutis, though some are found in the outer longitudinal muscle layer. 



The head glands are well developed and are of the typical Eupolia type. They reach 

 backwards as far as the level where the excretory tubules start. Anteriorly they open into 

 the well-marked frontal organ. 



4. Eupolia unistriata, n. sp. (PL IV. fig. 4.) 



Locality. Hulule, Male atoll, Maldive Is. From reef. 



Two specimens were obtained. The larger measures 55 cm. in length, whilst the average 

 breadth is 6 mm., and depth 4 mm. The smaller specimen measures 26 cm. in length and 

 5 mm. in breadth. In life the worms were white with a black stripe down the back. The 

 width of the stripe is less than 1 mm. In the larger specimen the stripe stops short at 

 the head furrow (PI. IV. fig. 4), whilst in the smaller one it is continued on to the snout. No 

 markings on the venti-al surface. 



In external form this species bears a great resemblance to E. melanogramma (Punnett, 

 Quart. Journ. Mic. Sc, vol. 44, p. 113). This resemblance is found also in the internal 

 structure. It will be sufficient here to indicate the main points of difference. 



The connective tissue layer of the cutis is not so thick as the glandular layer. In 

 E. melanogramma these proportions are reversed. 



The excretory system possesses numerous openings to the exterior, but it lacks the 

 peculiar ducts opening into the oesophagus which characterise E. melanogram,nia. 



The arrangement of the vascular system in the cerebral region is that characteristic of 

 the genus. In E. melanogramma the arrangement is slightly different {loc. cit. p. 115). 



With these exceptions the anatomy of the two species is practically identical. As 

 in E. melanogramma there is present also in this species a well-marked sub-anal nervous 

 commissure. 



5. Cerebratulus maldivensis, n. sp. (PI. IV. fig. 5, and PL V. figs. 3, 6, 9.) 



Locality. Miladumadulu atoll, Maldive Is. Dredged in 22 fathoms. 



This species is represented by about 30 mm. of fragments. The average breadth is 

 about 1'7 mm. The more posterior portion is much flattened, not measuring more than 

 •3 mm. in depth. The anterior end is more rounded. The hind end is missing. The 

 proboscis pore is terminal, and the mouth is situated about 2 mm. behind the tip of 

 the snout, which is somewhat pointed. Colour whitish after preservation. No markings 

 present. 



The epithelium is thin and contains a few unicellular glands which stain deeply with 

 picric acid. The basement membrane is exceedingly thin (PL V. fig. 3). Just below it there 

 is a well-marked layer of circular muscle fibrils and just beneath these again a few longi- 

 tudinal fibrils which are separated from the outer longitudinal muscle layer by a very thin 

 layer of cutis glands. The whole cutis is but feebly developed. 



The outer longitudinal muscle layer in the oesophageal region is about double the 

 thickness of the circular layer. The inner longitudinal layer in this region is of approximately 

 the same thickness as the circular layer. All these three layers are somewhat massive 



