9 
On a new Tentaculate Cestode. 203 
In the male of A. meridianus, Racovitza, from Tunbgidge 
Wells, both first maxille have five sete on the apex oF the 
inner lobe, the first thoracic leg has the propod distinctly 
oval, with the inferior margin straight and without any sign 
of a triangular projection to meet the end of the tip of the 
finger ; the fourth thoracic leg has on the carpus a distinct 
row of about ten long’ spinules ; the first and second pleopods 
are in close agreement with the characters assigned to this 
species, the outer margin of the exopod of pleopod 1 being 
without any trace of an emargination. In the female from 
Tunbridge Wells the inner lobe of maxilla 1 bears the five 
plumose sete both on the right and on the left sides; the 
exopod of pleopod 2 is trapezoidal in shape as described by 
Racovitza, 
Racovitza has examined specimens of A. mertdianus from 
Dulwich and from Slapton Lea (Devonshire), and from 
numerous localities in France. He finds it very constant in 
its characters ; it is, he says, not the only one of the series, 
other allied forms being found in the Mediterranean basin 
both in surface-streams and in underground waters. Of the 
underground forms, two—A. cavaticus, Schiodte, and A, foreli, 
Bl.—have already been described, and other forms will be 
described by M. Racovitza in a forthcoming memoir. 
X XIX.—On a new Tentaculate Cestode. 
By Franx E. Bepparp, D.Sc., M.A., F.R.S., F.Z.8. 
Tue occurrence of tentacles (I do not include the ‘‘ probos- 
cides” of the Tetrarhyncha) is so rare among Cestodes that 
a new example of this occurrence, characterising perhaps a 
" new species or genus, is worth bringing to the notice of 
zoologists. So far we are only acquainted with one strictly 
comparable instance, shown in thé genus Schistometra, of 
which I shall have something to say later. The only remain- 
ing tentaculate worms of this group are the little-known 
Paratenia and Polypocephalus, which are regarded by 
Braun* as possibly identical, but of whose systematic 
position the ascertained facts of structure do not permit 
us to form a definite opinion; nor does the recent redescrip- 
tion of Paratenia by Southwell+ definitely settle the matter. 
* In Bronn’s ‘ Klassen und Ordnungen des Thiereichs,’ Bd. vi. 
+ ‘Ceylon Marine Biological Reports,’ pt. vi., Jan. 1912, No, 22, 
