Kulvzoa of Bn'tiili Marine lis/ics. C9 



{Aspiduphorua) cataphractun, Ctenolabrus rt(j,e-f(ris, and 

 Jh'osiniiis brosiiK' — occur in Olssou's olisirvatioiis^ ultliuugh lie 

 makes no fominoiit ii[)()ii tlicm. 



Neither Olssoii nor \':in Hencdcn made any a^^^^'^^^pt 

 towards a s«oliition ol' the hfe-liistory of the Corms with ^' hich 

 they deal. The subject is diflieult and rc(|uires s|)ceial and 

 lonj; continued study. Lcvinscn* made an extensive search 

 amonjrst the marine Invertchrata of Cireenhmd for inter- 

 mediate I'ornis, and was sueees«.fid in three or four cases. 

 His results have not been confirnud. Latter Iv some 

 important work has been done in this direction by Miss 

 Lebour in Nortlnunberland t- She luis investigated many 

 of the commoner ^lollusca and has recorded frouj them quite 

 a number of sporoeysts and cereariie. The dilHculty of 

 tracing these to their final host still remains. 



In the Irish Sea at the Liverpool Laboratory considerable 

 additions have been made to the IJritish Entozoa fauna by 

 Johnstone J. Very few Tren)atodes are mentioned, Cestodcs 

 receiving most attention. His note on Distomiim valdem- 

 jlulum, Stoss., is interesting and will be refeircd to later. 

 'I he occurrence of Hemiunis a/>pein/icu/a/us in very small 

 (^-1 in.) plaice and dabs is curious, for this Trematode has 

 never been recorded IVom these fish in their adult state. 

 The mention of a form {^Dlstuinmn yitlosmn, Lintou) first 

 described from America is also noteworthy. Linton's work 

 on the American fishes § reveals many forms which are the 

 same as or almost identical w ith species already known from 

 corresponding European fish. He himself is unalde in 

 several cases to establish their identity ■with absolute 

 certainty. His work is valuable on account of the care wiih 

 ■which he has studiid and mcasureil the various important 

 organs, but unfortunately little exact information is to be 

 derived from his plates. 



Some experiments which I had an opportunity of conducting 

 ■N>ith sticklebacks may conveniently be described here. The 

 fact that the sticklebacks from brackish ditchc s were infected 

 Avith Pudocutyle utomuu, Kuil., to as grc at an extent as those 

 from the marine rock-pools suggested ascertaining the efi'eet 



* " r.klrnpr til Kunilskab oni Giiiiilaiuls Treniatodfauna," Oversigt Kyi. 

 Pniisk. SfL<kiib. 18.sl, pp. '^2 "i^A, jiLs. ii., iii. 



t '• Noti'S on NortluiLubrian Tieuiatodes," Northumberland Fisberies 

 Rrpnrt for 1905. 



X •' Internal Para-Mtes and Diseased Conditions of Fishes," Lancashire 

 Sea-Fisherips Report for KK)4, p. 98; 1905, p. 151. 



§ Prop. U.S. Nat. Mus. \x. pp. 41*3-450, pis. xx\ii.-x.\xiv. and pp. 507- 

 54«, pis. xl. liv. 



