Pournal of the Marine Piological Association. 
A List of the Nemertines of Plymouth Sound. 
By 
T. H. Riches, B.A., 
Caius College, Cambridge. 
THE present list, the result of observations made at intervals in the 
course of last year, was undertaken with the view of determining for 
embryological purposes the resources of the Sound with regard to this 
group. It includes the species obtained during a great part of the 
year 1892. 
Of the species recorded by McIntosh (1) as British, all but seven 
are here enumerated.* Of these seven, three, Amphiporus hastatus, 
Tetrastemma Robertiane, and Valencinia lineformis, are northern 
forms, occurring in Bressay Sound, Shetland, though one specimen of 
the first has been taken by Hubrecht (2) at Naples, and two by Joubin 
(4) at Roscoff. One, Borlasia Elizabethx, is a southern form, not yet 
recorded north of Herm. The fourth, Meckelia asuleata, described by 
McIntosh as having a wide range, has not been met with by any 
other writer. The fifth, Nemertes carcinophila, though included among 
the British Nemertines, has apparently not been found on the British 
shores—at least the only localities mentioned by McIntosh are Messina 
and the coast of Belgium. ‘The last, Amphiporus pulcher, is said 
“to be generally diffused round the British coasts in water eight 
to thirty fathoms deep,’? and seems to be common on the French 
coast and in the Mediterranean. I am inclined to think that a 
species which I describe below under the name of Amphiporus 
dissimulens, and which much resembles A. pulcher in appearance, 
has occasionally been taken for the latter. 
Since the publication of the monograph I only know of one addition 
to the Nemertine fauna of Britain, the interesting Carinoma Armandt. 
This has unfortunately not yet been found here. 
The total number of species here recorded is thirty-two. Four 
of these are new, Tetrastemma nigrum, T. immutabile, T. ambiguum, 
and Amphiporus dissimulans; one, Nemertes candida, is new to 
* An eighth, the deep-water Cerebratulus marginatus, should be added to the number of 
the British species which I have not yet obtained. 
NEW SERIES.—VOL. III, NO. I, ] 
