NEMERTINES OF PLYMOUTH SOUND. 11 
The arrangement of the cephalic grooves is somewhat peculiar, 
it is the same as that described by Joubin in A. pulcher. 
In the characters just given, the specimens included here do not 
seriously differ from A. pulcher, but they differ essentially in the 
structure of their proboscis, which resembles that of A. lactijfloreus, 
while that of A. pulcher, according to the description given by 
McIntosh, is widely different, and in the situation of their side organs, 
which is in front of the brain as in A. lactifloreus, and not behind it. 
These differences in proboscis structure and in position of the side 
organs rendering it impossible to assign these specimens to the species 
A. pulcher, it yet remains whether they ought not to be considered 
varieties of A. lactifloreus. But against this view are the characters 
above given of the shape of the head and of the tail, the number and 
arrangement of the eyes, the position of the cephalic grooves, and 
the difference of habitat, A. lactifloreus being a shallow water form, 
and these specimens being never obtained in less than 15 fathoms. 
It seems very probable that this species has been occasionally 
described as A. pulcher.  Joubin, for instance, in describing the 
specimens at Roscoff and Banyuls says nothing of the peculiar 
structure of the stylet region of the proboscis, so characteristic of the 
latter species, nor does he mention the situation of the side organs. 
On the other hand, he says that he has not seen the secondary 
cephalic grooves described by McIntosh ; and his figure of the arrange- 
ment of the primary grooves is, as has been said, perfectly applicable 
to this species. While, moreover, McIntosh finds only twenty-three 
eyes on each side of the head, Joubin describes as many as thirty- 
five or forty-five. 
Ripe specimens occur in the spring, but are more common in 
October, at a time when A. lactifloreus is not breeding. 
The only locality from which this species has hitherto been obtained 
is the Millbay Channel, where it occurs in considerable numbers. 
9. A. BrocuLatus, McIntosh. 
Only one specimen of this northern species has been obtained. 
It was dredged in Millbay Channel on November 18th, with 
many examples of the last species. Its length was about 1 cm. In 
colour it was somewhat different from that of specimens previously 
described, being a milky white, while the Shetland specimens were 
dull orange, and the two obtained at Roscoff were green. The 
description and figure of the head given by Joubin exactly apply to 
the present specimen. 
This species has not yet been found in the Mediterranean, and this 
is the only record from the coast of England. 
