Dr. W. Nlcoll on tJie 



Physostomi. 



Osmerus epula7ius. 



Lecithaster gibbosus, Hud. 



Scolex polyniorphus, Bud. 



Ascaris sp. (juven.). 

 Argentitia sphi/rcena, Linn. Argentine. 



Lecithopli) lluni botryophoron {Olss.). 

 Clupea sprattns, Liun. Sprat. 



Derogenes varicns {Mull.) (juven.). 



Lecithaster gibbnsus {Hud.). 



Ilemiurus liihei, Odhn. 



Scolex poljTnorpbus, Rud. 

 Ascaris sp. 



Ascaris sp. (juven.). 

 Ayignilla vulgaris, Turt. Eel. 

 Hemiurus communis, Odhn. 

 ( = 11. appendiculatus, mihi.) 



Plectognathi. 



Mola mola (Schneider). Sunfish. 

 Dihemistephanus lydias (Stoss.). 

 Ancistrocephalus microcephalus {Hud.}. 

 Anthocephalus reptans, Wagener. 



Intestine. 

 Intestine. 

 Liver. 



LOPHOBHANCHII. 



Syngnathvs acus, Linn. Pipefish. 

 Scolex polvmorphus, Hud. 

 Ascaris sp. (juven.). 



IV. 2. 

 IV. L 



Intestine. 

 Peritoneum. 



Podocotyle aiomon (Rud.). 



Odhner, Fauna Arctica, iv. (2) p. 320. 

 Nicoll, Ann. & Mag. Kat. Hist. (7) six. pp. 73-77. 

 Lebour, Northumberland Sea Fish. Kept. 1907, pp. 36-37. 

 Nicoll, Quart. J. Micr. Sci. liii. pt. 3, pp. 451-453. 



To the list of Britisli hosts of this parasite has to be added 

 Gasircea spinaclda. In one specimen of this fish half a dozen 

 examples of the parasite Avere found. They agreed well with 

 previous descriptions of the species, but the ova were parti- 

 cularly large, measuring -OSS-'OQ^ mm. in length and '051- 

 •062 in breadth. These are by far the largest ova I have 

 yet observed in this species^ and I was at first in doubt 

 wiiether the specimens were really Podocotyle atomon or some 

 allied species. Ko other differences of importance could be 

 made out. The length of the specimens is l*7-2*3 mm.; 

 oral sucker •14-*16 mm. in diameter; ventral sucker "20 X 



