276 88 



no protuberances on the disc into which the organ opened. No gastric glands. Above 

 the large testis ^vas the hyahne sac containing numerous sharply edged, light re- 

 fracting grains: I got the impression that the two lateral canals opened directly into 

 the sac. This may perhaps be a mistake; it is possible that they turned downwards 

 between the sac and testis and, as might be expected, opened on both sides of 

 the first foot joint, near the opening for the penis; there are three or four vibratile 

 tags upon either side of the lateral canals, but no contractile bladder; with regard 

 to brain, testis, prostata, penis, antennæ, eye, intestinal band and muscle system 

 it is in full accordance with the former species. In the body cavity manv oil glo- 

 bules. Size of male 250/;, of female 450 — 500,«. 



This species was found rather common in some ditches, covered with vegetation, 

 near Hillerod, time May — June; the male w^as observed on -'"jo 1921. I have onh' 

 seen two specimens, both djing before it was possible to get the wheel-organ fully 

 described; the males appeared in my vessels a week after the samples were taken. 



Euchlanis triquetra Ehrbg. 

 Tab. IV, fig. 3. 

 Description. The male has quite the same form as the female; the dorsal 

 plate bears the same extremely high crest as that of the female, and as here is 

 laterally expanded; the lateral furrow between the dorsal and ventral plate is very 

 deep as in the female. When Hldsox (1889, p. 91) says of the carapace in the female 

 that the crest is formed by a "special high thin vertical plate, which rises like a 

 crest from the dorsal surface", I do not understand him. As far as I can see it is 

 the real dorsal plate which is crested in both sexes; in this way it is also drawn 

 in Hudson's figure (Tab. XXIH, 4 c). The dorsal occipital edge of the male is not 

 or only slightly notched, whereas this is the case with the hind edge; the foot has 

 a structure differing from that of other Euchlanis species; it is without any segmen- 

 tation, peculiarly hairy, and dorsally bears a protuberance, in which the penis opens; 

 the toes are long, acute, possessing rather conspicuous foot glands. The wheel-organ 

 is formed as a ciliary wreath, most probably with an interruption dorsally as well 

 as ventrally; two rather well-developed auricles; ventrally in the middle line the 

 hairs are very long; ventrally on the disc are some elevations, bearing strong bundles 

 of long setæ. When the animal was dying, and the bristles had almost ceased to 

 strike, I got the impression of two series of peculiar curved, membranelles, inserted 

 medially and ventrally on the disc; similar membranelles have been pointed out by 

 De Beauchamp in the female of E. dilatata (1909, PI. I, fig. 5). As well known the female 

 of E. triqaetra is extraordinarily hyaline, and this holds good if possible in a still 

 higher degree about the male; seen laterally almost all the viscera are visible through 

 the lateral cleft; the retrocerebral organ is Aery large, filled with polyhedrons aréoles; 

 it sends a short cul de sac downwards to the brain where this bears the large red 

 eye; above the organ is a conspicuous hill, bearing the large dorsal antenna. Now and 

 then I think I have seen the protuberances bearing the openings of the retrocerebral 



