RHYNCH0B0THRID.E. 69 



Dibothriorhynchus Lepidopteri, Blainville, in Bremser, Vers de 

 V Homme, Append, t.2, f. 8, 2nd edit. 519 (Note), t. 2, f. 8; Diet. 

 Sc. Nat. lvii. 589 ; Guerin, Iconog. Regn. An. Zooph. t. 12, f. 4 ; 

 Nordmann, in Lamarck, An. S. Vert. 2nd ed. iii. 586 ; Dujardin, 

 Hist. Nat. Helminth. 553. 



Hob. a. Abdomen of the Salmon from Berwick Bay. 



Presented by Dr. G. Johnston. 



b. 1 From Iceland. 



Presented by C. Drewsen, Esq. 



3. Tetrarhynchus rugosus, Baird. (Tab. II. f. 3.) 



Body flattish, thick, exceedingly rugose, almost tuberculated, the 

 rugas 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 2-| 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 1^ 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 by a 

 septum, which at about the half of its length divides into two 

 portions ; the edges are raised and thickened. Proboscides 



