572 



Notices of Irish Eniozoa. 



Rudolphi, in a vial sent him by Tilesius, containing a num- 

 ber of Vermes taken from fishes, found a single specimen of 

 this species, but could not ascertain from what fish it had 

 been taken. He observes, 'Synopsis,' p. 130,— "Hab. in 

 pisce maris Japonici ; an Squalo ? Tilesius misit, locum qua 

 invenerit oblitus ; " and as its proboscides were retracted, and 

 he had not then seen a Tetrarhynchus, he was much perplex- 

 ed concerning it. " Cum acciperem Tetrarhynchum nondum 

 videram, ut specimen hocce proboscidibus retractis diu me 

 vexaverit."— P. 448. 



He describes the specimen alluded to as being flat and 

 thick ; margins straight, and obtuse ; sixteen lines long, of 

 which the head occupied four and a half; body posteriorly 

 three, and anteriorly, as also the head, two lines broad. — 

 Head oval, thicker than the body, with a solitary very narrow 

 or linear bothriwn, divided by a longitudinal raised line on 

 each side. Body somewhat narrower anteriorly, elongated, 

 obtuse behind, and terminating in a roundish papilla, rugose 

 on each surface. 



My specimen, preserved in alcohol, agrees exactly with 

 this description, except that it is larger. The outline, {fig. 

 28, a) which was taken from the recent animal, gives a more 



28 



a, Tetrarhynchus grossus, na- 

 tural size. 



by A portion of intestine, in 

 which two of the probosci- 

 des are buried, and there- 

 in fore invisible. 



c, Part of the head magnifi- 

 ed. 



d, Two of the proboscides. 



e, Linear bothrium. 



Tetrarhynchus grossus, Rud. 

 correct representation than Rudolphi's figures, which were 

 necessarily taken from a specimen contracted by immersion 

 in spirits. 



