KOFOID AND SWEZY: UNARMORED DINOFLAGELLATA 507 



Synoxy:my. — Pavillard (1905) figures as E. (ujilis Hertwig a small species 

 about half the size of Hertwig's, with more smoothly contoured body, more 

 conical e])icone, longer apical horn, more displaced girdle, and a black instead 

 of a red pigment mass. In view of the degree of speciation detected by tis in 

 the genus and because of these differences al)ove noted it seems probable that 

 Pavillard had a different species from that found by Hertwig (1884) at Sor- 

 rento. It appears to be similar to one we have found at La Jolla. We take 

 pleasure in naming it for Professor Pavillard, the investigator of the Dino- 

 flagellata of the Mediterranean. 



The Eri/thropsis which Paure-Fi-emiet (1914c) discovered at Croisic, 

 France, in 1913, and called E. (ujih's Hertwig, appears to be identical Avith that 

 figured by Pavillard (1905) from Cette. We have elsewhere (1917) given the 

 grounds upon wdiieh we reject Faure-Premiet's reversed orientation, origin and 

 reversed direction of the transverse flagellum and the longitudinal flagellum 

 emerging in the anterior loop of the sulcus from the apex. The red core or 

 "Erythrosome" was more in evidence in his material than in ours, but in all 

 other essential features except for those noted in our paj^er (1917) the simi- 

 larity is sufficiently close to justify the inclusion of the Erythropsis from Cette, 

 Croisic, and La Jolla in one species. 



Co^rrARisoxs. — Our specimen is not wholly in agreement in all details of 

 structure with that found by Pavillard. Its girdle is apparently not so steep 

 dorsally, its furrow is wider, its prod is not hispid and becomes capitate on 

 contraction, and it is 82/* in length, while Pavillard 's was only 55/^. However, 

 the lens is the same, the pigment mass similar in form, though lacking the yellow 

 to b]'own core as observed by us, and the tentacle and apical horn are alike in 

 our two specimens in important respects. In view of the margin of difference 

 to be allowed in accounts of organisms so difficult to observe accurately as this 

 mobile genus, it seems best to accept these resemblances as indicative of specific 

 identity and attriliute our differences to divergences of observation and record, 

 or to variation within the species. 



E. paviUnrdi ditfers, in certain distinctive features, from E. af/ilis Hertwig, 

 to which Pavillard (1905) referred his specimen, the third individual seen uj) 

 to that tune in the whole genus. The foremost of these is the red-pigment mass 

 of E. (tf/iJif! and the black one with yellowish-brown center of E. pnvillardi. In 

 addition Hertwig's species is about IOOm in length, while PavillaixPs specimen 

 was 55/* and ours 82/*. The antapex is truncate in E. agilis and rounded in E. 

 pavillard;. In addition there are minor differences in shape of tlic cpicone, 

 course of the girdle, and exposure of the lens. As will l)e seen on comparison 

 of the figures of all the species of the genus drawn to the same scale (text 

 fig. SS), the distinctions between them are noticeal)le. 



E. pavillardi belongs to the subgenus En/fliropsis in restricted sense and is 

 close to E. nihior, but differs from it in longer prod without st.ylet and more 

 rotund body of larger size. It is nuich smaller than E. corJdcd and lias a flat- 

 tened instead of rotund pigment mass. 



