KOFOID AND SWEZY: UNARMORED DINOFLAGELLATA 455 



individuals or specdes than an analysis of development. Any delimitation of 

 P. pohiphcmus (Poueliet) nnist therefore be based npon his figures and such 

 parts of his text as are descriptive thereof. 



In his earlier papers (1884, 1885rf) Pouchet discussed the ocellus and (1885a, 

 pi. 2, figs, la-c) figured several forms, each with an ocellus, but did not designate 

 the species beyond stating in his explanation of the plate that one of them was 

 "voisin de Gijuniodinium spirale.'^ The two or three forms figured in this 

 paper are, in the absence of comparable material, clearly indetermina])le be- 

 yond the probability that they belong to the genus Pouchetia. It is j)ossible 

 that his figure of the lens will permit the detection of one of these forms when 

 rediscovered. 



In a later paper (1885&) Pouchet figures, briefly describes, and names Gi/m- 

 nodinimn polijphoims, a different form from that previously (1885rf) figured, 

 and at the close of his statement refers the reader to his earlier paper (1885fl). 

 In view of this sequence we restrict the name poly ph emus to the organism 

 named in his later paper, delineated in the first of his figures (1885&, pi. 26, 

 fig. 3). The second figure (see his pi. 26, fig. 4) is a smaller organism, also with 

 ocellus, in binary fission in a cyst, and so lacking in details as to be wholly 

 indeterminable. It is therefore excluded from Pouchetia polyphemus. 



Neither Schiitt (1895), who established Ponchetia and refers to this species, 

 nor Lcmmcrmanu (1899), who eomijiled its species, refer Gi/))i)iodimum 

 pohjplicmua to Pouchetia. Pouchet 's confusion of species might invalidate the 

 accuracy of his record of this same species in the warm waters off the coast of 

 France and in the colder waters off Iceland. 



Pouchetia poucheti sp. nov. 



Plate n, figurt' 125; text figure PP, 4 



Diagnosis. — A rather large species; body broadly ellipsoidal, length 1.3 

 transdiameters; girdle a descending left spiral of 1.2 turns, displaced 0.6 trans- 

 diameters: sulcus with apical and antapical loops, torsion 0.75 turn; ocellus 

 diffuse, median, with distributed lens, lobed melanosome, scattered pigment; 

 cdlor, ])luish green. Length, 73/^. Pacific off La Jolla, July. 



Description. — Body rotund, broadly ellipsoidal witli sliglit irregularities. The epieone is 

 nearly 0.25 smaller in length than the liypoeone. Its apex is broadly rounded, liigher at the 

 right end, its outline notched on the riglit side by the apical loop of the sulcus, wliieh here 

 reaches the apex. It has a length above the anterior flagellar pore of 0.3 and at the distal 

 extremity of the girdle of 0.8 of the total length of the body. The hypocone is also l)roadly but 

 asymmetrically rounded, being prolonged beyond the h('niis])herical and slightly jiointed at the 

 right with its outline somewhat irregular on the left due to the sjiallow trough made by the 

 anta])ieal section of tlie sulcus. The shallow sulcal notch lies 0.3 tran.sdiameter to the left of the 

 antapex. 



The anterior junction of the girdle and siilois is located 0.3 of the total length of llie body 

 from the apex. The girdle passes around the ])ody in a descending left spiral which in the 

 pi'oximal 0.5 turn is nearly horizontal and is then deflected to a uniform slope of 25° from the 



