In Träns. Ent. Soc. Lond. 1897. Part IV. (Dec.) haben 

 L. C. MiALL und R. Shelford einige eigenthtimliclie Bildungen 

 im Herzen der Larve von Phalacrocera replicata (Lin.) fol- 

 gendermassen beschrieben : »There is one feature of the heart 

 which we have never met with in any other insect, nor do 

 we know of a close parallel in any other animal. Two cel- 

 lulär cords lie free in the cavity, which they traverse from 

 end to end. They are attached behind to the body-wall 

 between the spirades, and extend forwards as far as the 

 brain. They are here and there attached to the wall of the 

 heart by slender threads. The cords are cylindrical, and 

 consist of a transparent, slow-staining substance, in which 

 are inbedded innumerable quick-staining cells, with relativety 

 large nuclei. The cells are irregular, and often branched; 

 between them and towards the centre of the cord is an irre- 

 gular but probably continuous cavity. We are inclined to 

 think that this cavity is filled in the living larva with a 

 fluid, perhaps with blood. Sections reveal the very unex- 

 pected fact that the cords are of epidermic origin, tubular 

 extensions of the epidermis of the hinder end of the body. 

 They appear to pass into the heart through a pair of ope- 

 nings in its posterior wall. — In the pupa the cords become 



beaded, break up, and finally disappear altogether In 



a young pupa the cords are almost the same as in the larva, 

 while in a pupa approaching the time of final transformation, 

 not a trace of the cords is to be found.)^ 



Da ich seit Langem diese Organe bei derselben Larve 

 kenne — schon in den Jahren 1893 — 1894 demonstrierte ich 

 dieselben den Herren Proff. A. Quennerstedt und D. Ber- 



L. C. MiALL and R. Shelford, Tbe Structure and Life-history of Pha- 

 lacrocera replicata. pag. 351 if. 



