166 Mr. H. N. Moseley on Pelagonemertes Rollestoni. 
remained an imperfect one, and the affinities of the animal 
amongst other Nemertines could not be determined. 
The animal is leaf-like in shape, narrowing toa blunt point 
at the posterior extremity, and commencing abruptly at the 
anterior. The proboscis is protruded from the summit of a 
protuberance occupying the middle region of the anterior 
extremity. The mouth is situate on the ventral surface of 
the body, just posterior to the aperture for the proboscis. 
It is a simple aperture, with a plaited margin composed of 
five or six folds. It is the commencement of a short muscular 
tube, the cesophagus, which was seen to pass behind the most 
anterior prolongation of the main mesial digestive canal, but 
the communication of which with the latter was not traced. 
The digestive system stands out very conspicuously in the 
fresh condition of the animal, from being of the deep burnt- 
sienna colour already mentioned. It consists of a broad, 
flattened mesial canal, somewhat broadest in the middle region 
of the body, anteriorly ending in a bluntly terminated cecal 
prolongation, and posteriorly narrowing gradually. As the 
posterior part of the animal was somewhat injured, it could 
not be determined whether the canal terminates in an anus 
or not. 
The mesial canal receives on either side lateral tributaries 
in pairs, which tributaries remain simple for some distance of 
their horizontal course and then break up into ramifications. 
The most anterior pair of lateral canals is split up into by far 
the most ramifications. The ramifications become less and 
less in each pair towards the posterior extremity of the body, 
some of the most posterior lateral canals being simply bi- 
furcate, and one merely enlarged at the extremity. There 
are thirteen pairs of lateral canals in all. 
The nervous system was plainly seen in part. A pair of 
rounded ganglia lie on the ventral and lateral surface of the 
sheath of the proboscis, being a little posterior in position 
to themouth. A commissure passes above the cesophagus and 
between it and the proboscis-sheath. From the ganglia a 
pair of fine simple nerve-cords pass in a curved course down 
to the posterior extremity, where their termination could not 
be ascertained. The cords cross ventrally the lateral digestive 
canals about the point where ramification commences. Further 
connexions of the ganglia could not be ascertained. 
The specimen obtained was a female, A series of ovaries, 
consisting of pear-shaped masses of minute ova, were present, 
situate between each of the pairs of lateral digestive tubes, 
immediately external to the nerve-cord on each side. The 
masses of ova are contained m small cavities in the gelatinous 
