RHYNCHOBOTHRIDA. 69 
Dibothriorhynchus Lepidopteri, Blainville, in Bremser, Vers de 
l’Homme, Append. t. 2, f. 8, 2nd edit. 519 (Note), t. 2, £8; Dict. 
Se. Nat. lvii. 589 ; Guerin, Iconog. Regn. An. Zooph. t. 12, f. 4; 
Nordmann, in Lamarck, An. S. Vert. 2nd ed. iii. 586; Dujardin, 
fist. Nat. Helminth. 553. 
Hab. a. Abdomen of the Salmon from Berwick Bay. 
Presented by Dr. G. Johnston. 
b. 
Presented by C. Drewsen, Esq. 

? From Iceland. 
3. TETRARHYNcHUS RUGOSUS, Baird. (Tab. II. f. 3.) 
Body flattish, thick, exceedingly rugose, almost tuberculated, the 
rugee extending right across the body, which is of a white colour. 
Head conical, thicker than the body and about one-fifth the 
length of it. Bothria inversely heart-shaped (the broader part 
being at the lower margin), deep, divided at the bottom by a 
narrow septum; edges thick and raised. Proboscides round 
and club-shaped at their tips. Inferior extremity of body as 
it were truncate. Total length (in spirits) 10} lines. Breadth 
of head 23 lines, of lower part of body 3 lines. Bothria 2 lines 
in length. 
In one specimen the head is much broader than inferior extremity 
of body, being about 3 lines broad, while the inferior extremity 
is only 2 lines, and is terminated by a heart-shaped appendage 
of about 14 line long and of a light rose colour (the Male ?). 
Hab. Taken alive from the lower intestine of a Salmon. 
Presented by W. Baird, M.D. 
4, TETRARHYNCHUS STRANGULATUS, Baird. (Tab. II. f. 4.) 
Body flat, of a light yellowish colour, thickish, elegantly and mi- 
nutely striated across, and marked with slight longitudinal 
sulci, which run the whole length of the body. The head is 
narrower than the portion of the body which immediately suc- 
ceeds it, is about four lines in length, is longitudinally sulcated 
on the sides, smooth on the two faces, and is distinctly separated 
from the body by a contraction, which gives the appearance as 
if it were of a shoulder to the commencement of the body. The 
_ Bothria are shallow, oval-shaped, and divided at the bottom bya 
septum, which at about the half of its length divides into twé 
portions; the edges are raised and thickened. Proboscides 
