NEMERTINES OF PLYMOUTH SOUND. 27 
of the body there was a sudden reduction in girth, followed by the 
usual caudal appendage. 
Ripe individuals are found from October to the end of the year. 
30. M. canpipa, Birger. 
NEMERTES LACTEA. 
CEREBRATULUS LACTEUS, Hubrecht. 
I refer to this species a Nemertine which was dredged at Stoke 
Point on the 10th of November. It was 1°5 cm. long, of an opaque 
white colour, and possessed a caudal appendage. Eyes seemed to be 
absent. Unfortunately while under observation the animal died, its 
body rupturing in an extraordinary manner, and from no ascertain- 
able cause, and emitting clouds of spermatozoa, 
This species has not previously been recorded in Great Britain ; 
it is common at Naples, and occasionally found at Banyuls and 
Roscoff, but the absolutely white variety seems to be rare on the 
French coast. 
Genus CHREBRATULUS, Remer, Birger. 
Relatively broad, powerful forms, which roll themselves spirally 
and do not tie themselves in knots. They are excellent swimmers, 
cutting through the water in an eel-like manner. In transverse 
section the body forms a long ellipse. The lateral edges of the body 
stand out like longitudinal folds. Head lancet-shaped. All have a 
caudal appendage. 
31. C. ruscus, McIntosh, Hubrecht. 
Micrura Fusca, McIntosh. 
A few specimens only have been obtained. The first was dredged 
in 4 or 5 fathoms in Jennycliff Bay on November 30th, a few 
others were dredged between the Mallard and Cobbler Rocks. Of 
these specimens the smallest was 2 cm. in length, and the largest 5 
cm., the latter being 3 mm. broad at the tail, and the caudal appendage 
reaching the length of 2°5 mm. 
There is much variability in the disposition of the brown flakes of 
pigment on the yellow ground colour. In some specimens the brown 
pigment was limited to the head, in others it was present over the 
whole dorsal surface of the body, but in all cases it was very sparsely 
if at all distributed on the ventral surface. 
The disposition of the eyes is very irregular. In one specimen I 
counted eight eyes. Two of these were situated in corresponding 
