1899-1900.] Dr 0. von Linstow on Tetrabothrium. 159 
Tcenice; the scolex carries four large sucking cups, which touch 
each other with their edges completely or partly, and are drawn 
in front or behind into an angle ; the proglottides are short, the 
genital openings are marginal and unilateral, and pass into a 
genital sinus with strong muscular walls, on the inner side of 
which lies the round cirrus-pouch. The vas deferens is rolled up 
in numerous coils; the parenchyma muscles, especially the longi- 
tudinal muscles, are strongly developed, and on each side two 
longitudinal vessels join together; the ovarium is strongly de- 
veloped, the small oviduct lying before it. This is briefly the 
diagnosis of the genus, as given by me * when describing Tetra- 
bothrium cylindraceum , and it corresponds perfectly with Monti- 
celli’s genus Prosthecocotyle and with Lonnberg’s Bothridiotcenia ; 
the genera Prosthecocotyle , Monticelli, and Bothridiotcenia , Lonn- 
berg, are thus synonyms of Tetrabothrium , Rudolphi, and as the 
last-mentioned name has priority, Fuhrmann is mistaken in believ- 
ing that the two species described by me belong to the genus 
Prostliecocotyle i for they must be placed in the genus Tetrabothrium . 
Fuhrmann, in his description of Tetrabothrium , says : — “ The 
interpretations of the male sexual apparatus given by Linstow are 
inexact,” yet my description of the male organs is limited to the 
sentence : — “ The cylindrical cirrus is protruded to a length of 
0*082 mm., and is 0*016 mm. in breadth,” which is perfectly 
correct. Fuhrmann further says that my representation of the 
scolex of Tetrabothrium torulosum does not correspond with the 
actual relations, but I maintain, on the contrary, that having pre- 
pared my drawings carefully with the aid of the drawing appa- 
ratus, it must be assumed that they really show the actual relations. 
I forbear to express an opinion regarding Fuhrmann’s drawings. 
Fuhrmann finally says that my drawing of Tetrabothrium auri- 
culatum is identical with Diesing’s Tetrabothrium heteroclitum ,f but 
neither from the description nor the drawing can this identity be 
recognised. Diesing says : — “ Caput clavatum, bothriis lateralibus 
oblongis prominulis, limbo tumidulis, antrorsum convergentibus,” 
* Centralblatt f. Bakter . , Parasitenk., und Infektionskrankh ., Abth. I. Bd. 
xxvii. pp. 365-6, Jena, 1900. 
t Denkscli. math.-nat. Cl. d. k. Akad. d. Wissensch. , Wien, Bd. xii. p. 28, 
tab. II. figs. 25-37, 1856. 
