PARASITES OF THE SALMON OF THE TAT. 151 



enveloped in a tougli white investment, and appeared one mass of 

 cells of an elliptical form — some with and some without nuclei. 

 Fibrous and muscular bauds and peculiar tubes stretched back- 

 wards from the spinigerous columns. Some of the tubes were filled 

 with cells ; others, probably from bursting, were empty. 



Anteriorly it was armed by the four formidable spinigerous 

 processes capable of protrusion and retraction. Each consisted 

 of an elongated and somewhat tapered stalk covered with a com- 

 plete array of curved spines resembling on a miniature scale those 

 on the rose, viz. with a broad base and strongly curved sharp 

 point. They were regularly arranged on the column, and towards 

 the base showed an interesting gradation into short, closely grouped 

 blimt tubercles, not unlike the horny scales on the foot of a 

 land tortoise. Below this the spinigerous column was marked by 

 a constriction followed by a slight bulgiug, and ran inwards in the 

 shape of a tubular process connected with a curved elongated sac. 

 The sac was covered with an immense number of cross striae as 

 well as longitudinal furrows. Prom the opposite end of the sac, 

 the tube was continued into the general body of the animal, and 

 became filled with the oval cells and granular matter every- 

 where so prevalent. On the addition of acetic acid, immediate 

 effervescence resulted in certain opaque and translucent masses 

 ux the interior of the animal ; and the numerous cells formerly so 

 conspicuous became transparent and indistiuct, or were broken 

 up into smaller cells. 



Once afterwards the scolex of a species of TetrarhyncJius (fig. 2, a) 

 occurred in the rectum of a salmon. It contained the usual 



Fig. 2. 



small, smooth, oval bodies or cells, quite pale and translucent {b). 

 Under the action of dilute glycerine and pressure they assumed 

 the shapes (e) aloug with some of the other contents of the scolex. 



Three or four specimens of Echinorhynclius inflatus (Rud.) oc- 

 curred in the intestines. 



Only two specimens of Echinorhpiclius tereticollis (End.)* oc- 



* [This is JEchinorhyncTius Froteus of Dujardin, Von Siebold, and other 

 modem authors. Accordmg to Prof. Rudolf Leuckart's very recent and ex- 

 tremely interesting discovery, this species undergoes a series of remarkable 



