KOFOID AND SWEZY: UNARMORED DINOFLAGELLATA 465 



the latter crosses the apex while it curves dorsally below it in the former. The 

 lens is elongate in P. suhnigra and hemispherical in P. ruhescens. They diffei- 

 also in proportions and size of body. 



Pouchetia schuetti nom. sp. nov. 



Text figures PP, 10, 11 



Pouchetia rosea (Pouehet) Schutt (1895), pp. 95, 96, 169, pi. 26, fig. 92,_,„. Figure 92ii, 



marked 984 on plate. 

 P. rosea, Lemmermann (1899), p. 360. In part. 

 P. rosea, Schroder (1900), p. 14. 



P. .rosea, Pavillard (1905), p. 48, pi. 3, fig. 4. This is P. rosea (Pouehet). 

 P. rosea, Paulsen (1907), p. 24; (1908), pp. 105, 106, fig. 146. In part, includes P. rosea 



Pouehet. 



Diagnosis.- — A medium sized species of as^anmetrical ovoidal form, expanded 

 posteriorly, its length 1.4 transdiameters ; girdle a descending left spiral of 

 1.25 turns, displaced nearly 0.5 transdiameter ; sulcus with about 1.5 turns, with 

 apical and antapieal loops; ocellus dispersed with lens of five segments and 

 black, dendritic, amoeboid melanosome, plasma rosy. Length, 70-87/^. Atlantic, 

 Mediterranean. 



Description. — This is based on Sehiitt's (1895) figures 92,._j2, explanations of figures, and 

 brief textual references. The body is asymmetrically and irregularly ovoidal, flattened ventrally, 

 convex dorsally, and expanded posteriorly. Its length is 1.4 transdiameters and the dorsoventral 

 diameter is 0.9 of the transdiameter. The epicone is longer than the hypocone and perhaps 

 larger. Its apex is rounded and more convex dorsally than ventrally, and, in ventral view, 

 somewhat flattened transversely. Its lengths at the proximal and distal ends of the girdle are 

 0.6 and 1 transdiameter respectively. The hypocone is more distended, very convex postero- 

 dorsally and excavated ventrally, the sulcal notch being carried up ventrally and to the right. 



The girdle begins a little anterior to the middle of the body, makes an even descent of a full 

 turn of a descending left spiral, steepens distally rather abruptly as it joins the sulcus, coiii- 

 plctiiig in all at least 1.25 turns. Its distal end is only about 0.2 transdiameter from the post- 

 margin. The furrow is about 0.06 transdiameter in width with well marked lips. Tlie sulcus 

 is not fully delineated but runs from the middorsal region of the epicone posteriorly' to the right 

 postmargiu with a torsion of nearly 1.5 turns. The apical loop above the girdle extends 0.5 

 turn upon the epicone, the intercingular torsion is about 0.25 turn, and the antapieal loop below 

 the posterior flagellar pore is deflected to the right, where it probably makes about 0.75 of a 

 turn (fig. 92ji). The whole sulcal region is somewliat deeply impressed into the body. The 

 transverse flagellura fills the whole length of the girdle. The longitudinal one arising from the 

 pore at the junction of the posterior end of the girdle and the sulcus is about 0.5 transdiameter 

 in length. 



The ocellus is of the dispersed or non-integrated type. It lies at the left of tlie intercingular 

 sulcus near its postei-ior end and very near the posterior end of the body. Its total length is 

 about 0.45 ti'ans<lianieter, and its axis is directed anterodextrally at an angle of about 20° from 

 the vertical. It consists of an elongated, segmented, hyaline lens of five appressed parts in a 

 linear series or loosely assembled. Posterior to these and somewliat envelojiing them is a black, 

 amoeboid melanosome of irregular shape, which during observation spread out into branching 

 lobed amoeboid processes reaching from the girdle to the antapex in the peripheral plasma. 

 No colored core was noted. 



