759 



But a more careful examination showed not only that they were 

 not Microstoma^ but that they could not be satisfactorily placed in any 

 accepted group of Turbellaria. Each specimen consisted of two well 

 developed Zooids, measuring in one case 1,2 mm in length, and, 9 mm 

 in the other; These individuals of the second order already showed signs 

 of further division since the sense organs of the third generation could 

 already be detected. 



At the anterior end there is a large mouth opening into a pharynx, 

 of which the thin walls are thrown into a 

 series of complicated folds, especially on 

 the neural side. 



This folding is evidently connected 

 Avith the great distensibility of the pharynx, 

 since two large Lyncaeids were found in 

 the intestine of one form. 



Fiff. 1. 



-S.o. 

 -Ph. 



N. 



Fiff. 2. 



s.o 



S.O. 



-Int. 



-Ph. 



Fig. 1. An apo-neural view ot a budding stock of Weldonia paraygucnsis. The neu- 

 ral groove and sense organs are seen by focussing down. 16 mm. X 6- Comp. Oc. 

 Fig. 2. Section through anterior and of individual of the third order. Showing the 

 nervous system ending as a tube on the opposite side to the junction of the pharynx 

 with the intestine. 4 mm. Apochromat. X 4. Comp. Oc. 



The pharynx passes into a large simple intestine, and there is no 

 trace of an anus. 



The most interesting feature of the creature is however furnished 

 by a deep grove which passes down the whole length of the animal termi- 

 nating at the end of a short tail. 



