1917] Kofoid-Swezy: On the Orientation of Erythropsis 97 



In the previous year Sehiitt (1895) had figured two species which 

 he called Pouchetia cochlea and P. cornuta. Both had the ocellus, as 

 have other species of Pouchetia, but in neither one did Sehiitt detect 

 the prod, although he figures it in P. cornuta as hidden in the poste- 

 rior recess, but leaves it unnamed and unnoted. Owing to this record 

 and to his discovery of the paradinial lines (fig. 12, par. I.) along 

 the girdle, not seen by Hertwig (1885) but now known to be char- 

 acteristic of the genus, his figures of P. cornuta have been referred to 

 Erythropsis by Pavillard (1905) and Faure-Fremiet (1914). 



Sehiitt 's figures (1895, pi. 26, figs. 96, 1, 2, reproduced in our 

 figure 12), continue and confirm the previous confusion regarding 

 the location of the anterior flagellar pore. In these figures the girdle, 

 instead of arising at a junction with the sulcus above the ocellus, comes 

 down from the apical horn. The upper end of the sulcus is thus con- 

 fused with the proximal end of the girdle. 



In 1905 Pavillard had the opportunity to inspect for a brief period 

 another specimen Avhich he referred to Hertwig 's Erythropsis agilis 

 and presented for the first time an adequate sketch from life of the 

 entire animal, but he also figures the transverse flagellum as running 

 up this apical horn. 



Collin (1912) records the discovery of another specimen of 

 Erythropsis in the student laboratory at the Biological Station at 

 Cette and Faure-Fremiet (1914) states that Chatton had seen another 

 at Banyuls-sur-Mer. 



Thus up to the time that Faure-Fremiet (1914) saw his "ving- 

 taine" of specimens at Croisic on the west coast of France in the sum- 

 mer of 1913, not more than six specimens of this peculiar and puzzling 

 organism had been seen. 



Whatever doubt and suspicion may have persisted as to its validity 

 had been made entirely untenable by Pavillard 's account, but the point 

 of origin and the course of the transverse flagellum were still unde- 

 termined, and the presence or not of a longitudinal flagellum in addi- 

 tion to the prod was problematical. A peculiar stout flagellum-like 

 structure was figured by Sehiitt (1895) for P. cornuta, but the presence 

 of a prod or tentacle in this species was not clearly established. 



In 1913 Faure-Fremiet published a brief note recording Ery- 

 thropsis from the w^est coast of France and followed this with a fuller 

 account than anyone has yet made of this remarkable organism. In 

 his later paper (1914) he orients it (fig. 11) with the prod anterior, 

 the ocellus directed posteriorly, and the apical end as the antapical. 



