ON A TAPEWORM PARASITIC IN THE STICKLEBACK. TLS: 
8. The Structure and Life-History of a Tapeworm 
(Ichthyotenia filicollis Rud.) Parasitic in the Stickle- 
back. By F. J. Meeerrr, M.Sc. (Birm.), Board of 
Agriculture and Fisheries Research Scholar, University 
of Birmingham *. 
[Received November 17, 1913: Read March 3, 1914. ] 
(Plates I.-IV.t & Text-figures 1-5.) 
InDEx. 
Page 
IN PRODUCTIONS fs jc. c4 sy ae aaron GS 
ANATOMY. 
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Occurrence menses jst een, ee LL 
Externally © harackers eee eee: eee enenes milellcy 
Histology Wn edi eee oe A Rea UTS 
Miusculatune meee eran papa eee ares S19 
Exeretory System ............0.0.0.........0... 119 
Nervous System ..............0.0..:000cc:2000-. 121 
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Lirs-History. 
ELIS HOT COU FF eis Fears. teeta hse peau TOLL 
Infection Experiments ........ 00.00.0000... 125 
Developinentiee se mcs cc ee ees LO 
SUMMUMAUR Wap a5. 0, bra. cece se fear eer is cance 135 
AGT AUN RE ion Pete saat ts clemiees cere nts TDS 
INTRODUCTION. 
Ichthyotenia filicollis Rud. (= Tenia filicollis Rud.) is a species 
the life-history of which, like that of most Ichthyotenie, is prac- 
tically unknown. No successful infection experiments have been 
carried out upon any member of the genus, and it was therefore 
thought that a connected account of the whole life-history would 
be of service in establishing a complete diagnosis of the family. 
In carrying out this work it was found that the only two complete 
descriptions of this species, those of Kraemer (10) and Benedict 
(3), are said by La Rue (12) to be descriptions of other species : 
if this be correct, then there is at present no paper giving a 
detailed and accurate study of this species. The paper is there- 
fore divided into two parts, the first being a detailed account 
of tne anatomy of the specimens obtained, compared with the 
descriptions of Kraemer and Benedict, and the second an account 
of the life-history as far as it could be determined. 
J wish here to express my indebtedness to Professor F. W. 
* Communicated by Prof. F. W. Gawsrn, F.RS., F.Z.S. 
+ For explanution of the Plates see p. 137. 
Proc. Zoou. Soc.—id14, No. VILL. 8 
