87 275 



which may most probablj' be regarded as ganglia cells. Medially through the body 

 is stretched a long, bright band, reaching from the wheel-organ down to the testis, 

 embracing this with two arms. It is a remarkable fact that I have quite distinctly 

 seen, almost in the middle line of the band, on the sides, two pyriform bodies which, 

 according to place and structure, can only be interpreted as gastric glands, only 

 rarely found in the male sex, and not in the other males hitherto known in this 

 genus. I am not quite sure, that the band is not hollow; it seems to contain a 

 number of globules, most probably of oily structure. 



Hitherto I have never seen coloured particles, which could be regarded as food 

 in it, but often those bodies which Leydig has described as "unverkennbare Reste 

 der Magenzellen, grosse Blasen nämlich, mit Häufchen solcher gelbbrauner Körner 

 welche die Magenzellen aller Rotatorien erfüllen (1857, p. 404)." 



The excretory organ with regard to the canals shows great resemblance to that 

 of the female; the number of vibratile tags are three or four; whereas Cohn mentions 

 and conspicuously draws a contractile vesicle, I have never been able to observe 

 this; the openings of the canals have not been seen. The large testis, containing a 

 great number of two sorts of spermatozoa, is flanked by two large prostata glands 

 and debouches into a long penis tube ciliated inside and with the opening surrounded 

 bj' a circle of cilia. Above the testis and shining through the animal is the great 

 globular, hyaline sac-like body, filled with an opaque mass. Size of male 200 //, 

 of female 260—380 f,. 



I have met with this male rather often during the time from April to May. 

 The mating process I have not seen, but it was found in different small pools, 

 where Euchlanis dilatata was verj' common, and where I have never seen other 

 Euchlanis species than this one. 



Euchlanis lyra Hudson. 

 Tab. IV, fig. 2; Tab. V, fig. 4. 



Description. It is with some doubt, that I have referred this male to this beau- 

 tiful, but rather rare species; the female is best characterised by the peculiar ventral 

 plate, with its curiously rounded end of the flange, unlike that of any other Euch- 

 lanis; it is further broadest at the hind end and elliptical in outline; the dorsal plate 

 has no notch behind. In the above-named male the ventral plate had almost straight 

 sides and the posterior edge was slightlj' excavated, formed in another way than 

 the ventral plate of the female; as the whole form of the male was exactly that of 

 the female, and the male was hatched in the vessel containing the true E. lijra, with 

 its characteristic ventral plate, I provisionally refer this male to this species. 



There are two auricles, separated from the other part of the ciliary wreath by 

 a short space without cilia; the whole ventrally curved disc was covered with a 

 coating of cilia; dorsally three tubercles coated with long, strong cilia. Fig. 4, Tab. V 

 gives a sketch of the wheel-organ, seen ventrally; as the animal died it was not 

 studied thoroughly enough. The retrocerebral organ was very large, but I could tind 



