CRATEROMORPHA. fjh 



the sides as well as at both ends, — in fact, all aronnd. That this 

 represents the trne condition can be asserted only nnder the 

 assnmption that the section really passed throngh the Uxo poles, 

 which is however not certain. I regret that the point could be 

 determined neither on other sections of the same embryo nor on 

 any other of the material in hand. — The inner mass now shows 

 an advance in that the reticulum, before described from fully 

 developed larvae, is distinctly observable in it. The open-meshed 

 reticulum is for the most part situated at the periphery in one 

 moiety of the body, which moiety is then probably to be 

 regarded as the anterior. The cellular elements lie denselv 

 crowded in the central as well as in the posterior parts of the 

 mass. There exists a distinct indication that the reticular and 

 the cellular tracts penetrate to a certain extent into each other. 

 In the latter tract there occur a few irregular slit-like gaps. 

 The oxystanractinic spicules are still quite small. 



Intermediate stages leading over the one just described to 

 the fully developed larva were not discovered ; Init it will not be 

 difficult to imagine the changes l>y which the form and organi- 

 zation of the latter is reached. 



CRATEROMORPHA J. E. CIray. 



r^ip-like or bowl-like, firmly attached by distinct 

 stalk; large or moderately large. Excurrcnt canalai' 

 apertures on gastral surface probably always freely 

 open. Stalk generally not tubular but traversed by a 

 system of anastomosing (excurrent) canals. Parenchy- 



