KOFOID AND SWEZY: UNARMORED DINOFLAGELLATA 480 



A peculiar organ, designated by Hertwig (1884) as a "spoon" or spear, is figured at a point 

 corresponding to the right side of the sulcus, near its junction with the distal end of the girdle 

 and possibly the upper end of the tentacular recess. It is a recurved ectOplasmic structure. 

 Its significance is problematical. It might be the contracted longitudinal flagellum, or the 

 denuded axial fiber of the tentacle or possibly an artifact. Its location militates against the 

 first two suggestions. Hertwig (1884) does not figure a longitudinal flagellum. 



T)i:mexsioxs. — These are ("oniputed on the basis of Hertwig's (1885) state- 

 ment that the organism is 120/^ in length. Length, 120/^; trausdiameter of body, 

 847* ; diameter of lens, 32m ; of pigment body, 45/*. 



OccTTREENCE. — One individual seen by Professor Richard Hertwig in April, 

 1884, in the plankton of the Mediterranean off Sorrento, Italy. 



Activities. — The tentacle was exceedingly active, contracting to half its 

 full.y extended length, which was four times that of the body. The tentacle 

 was dropped off when the animal was placed under the cover glass. 



Synonymy. — This is the type species of the genus and of the new subgenus 

 Ert/fhropsis sensn sfn'efx. There is no critical evidence that the assignment 

 by ]\fetchnik()ff (1874) of the organism he discovered off the Madeira Islands 

 in 1872 to E. agilis is correct. In so far as his brief description goes, it might 

 equally well be applied to several other species in the genus. It will suffice to 

 regard it as an Erythropsis and questionably E. afjilis Hertwig. 



Pavillard's (1905) assignment of a single individual discovered by him at 

 Cette to this species must be set aside and this individual assigned to a new 

 species, E. paviUardi, on grounds given elsewhere in this paper. Jollos (1930) 

 inadvertently uses the name Erythropsis hertwigi in referring to the organism 

 discovered by Hertwig. This name has no valid status. 



It seems probable that the species described by Paure-Fremiet (1914) as 

 E. afjilis Hertwig is in reality E. paviUardi nom. sp. no v. We have elsewhere 

 discussed (see Kofoid and Swezy, 1917) the grounds upon which we reject 

 Paure-Fremiet 's proposed orientation of Erythropsis '^agilis" with the tentacle 

 or prod anterior. 



CoiNiPARisoxs. — This species is one of the specialized forms of tlie genus with 

 concentrated ocellus and large and powerful tentacle. Its ocellus resembles 

 that of E. paviUardi and E. minor, but it is much larger than either of these 

 species and has an entirely different tentacle, neither capitate nor tapering and 

 without stylet. Hertwig's (1885) statement, if correct, that the length is 120/* 

 makes E. agilis next to the largest species in the genus. It is exceeded only by 

 E. cochlea. 



Erythropsis cochlea (Schiitt) 



Text figure SS, 7 

 Pouchetia cochlea Schiitt (1895), pp. 96, 169, pi. 26, fig. 95. 



Diagnosis. — A very large species with rotund body, its length 1.2 transdiam- 

 eters ; girdle displacement ( ?) ; ocellus not protuberant, with small spheroidal 

 lens, and a large black spheroidal pigment mass; prod not noted; peripheral 

 vacuoles subpolygonal, crowded. Length, K50/*. Atlantic ( ?) or Bay of Naples. 



