158 Proceedings of Royal Society of Edinburgh. [sess. 
On Tetrabothrium torulosum and Tetrabothrium auriculatum. 
By Dr O. von Linstow, Gottingen. Communicated by 
Sir John Murray, K.C.B. 
(Read May 21, 1900.) 
In my report on the Entozoa, brought home by the “ Challenger ” 
expedition, I described two new species as Tetrabothrium torulosum 
(from Diomedea bracliyura) and Tetrabothrium auriculatum (from 
Thalassceca glacialis and Daption capensis ).* My descriptions 
have recently been subjected to adverse criticism by Fuhrmann,f 
who maintains that these two species do not belong to the genus 
Tetrabothrium , but to the genus Prosthecocotyle ; that Tetraboth- 
rium auriculatum is identical with Tetrabothrium ( Amphotero - 
cotyle) elegans-heteroclitum , Diesing; that these two Cestodes are 
not Tetrabothria but typical Tamice ; that my drawing of the scolex 
of Tetrabothrium torulosum does not correspond with the actual 
relations ; and that my representation of the masculine genital 
organs of Tetrabothrium auriculatum is inaccurate. 
With reference to the genus to which the two species are to be 
referred, I certainly could not place them in the genus Prostheco- 
cotyle, for my description appeared in the year 1888, while 
Prosthecocotyle of Monticelli, and the synonymous genus Both- 
ridiotcenia of Lonnberg, were founded in 1896. The genus 
Tetrabothrium was known to me by two species : Tetrabothrium 
cylindraceum , Bud., and Tetrabothrium macroceplialum, Bud., the 
two typical species upon which Budolphi, about a hundred years 
ago, founded the genus Tetrabothrium , and as the two species in 
question agreed in all essential points with the two species 
described by Budolphi, I placed them in the genus Tetrabothrium. 
Tetrabothrium is not related to the Bothriocephalids but to the 
* “ Challenger ” Reports, Zoology, vol. xxiii. part lxxi. pp. 14, 15, PI. II. 
figs. 16-20, 1888. 
f Zool. Anzeiger, No. 561, pp. 385-388, 1898; Proc. Roy. Soc. Edin., vol. 
xxii. pp. 641-651, 1899. 
