466 MEMOIRS OF THE UNIVERSITY OF CALIFORNIA 



The nucleus is a broadly reniform structure in the left middorsal region. Its major and 

 minor axes are respectivel}' 0.8 and 0.45 transdiameter in lengtli. It is traversed lengthwise by 

 fine crowded chromatin threads. No pusules were noted. A large ochraceous food ball lies in 

 the center of the hypoeone near the nucleus. The plasma is ro.sy from peripheral, anastomosing 

 erythrosomes which in the moribund state round up into spheres of fairly uniform size and 

 distribution, somewhat in lines, in the peripheral plasma which is elsewhere colorless. Among 

 these are found elliptical, reniform and slipper-shaped leucoplatysomes, 0.10 to 0.14 transdiameter 

 in length. 



Schiitt's specimens were each enclosed in a transparent, hyaline cyst somewhat larger than 

 the body. In the case of one of the individuals (fig. ^2^_.) the cyst wall was double-contoured, 

 more closely applied and a second cyst wall was detaching itself on the ventral face. This 

 individual was evidently moribund, much rounded up as a whole with the rosy pigment of the 

 plasma concentrated into the so-caUed erythrosomes and the pigment mass of the ocellus retracted 

 into a compact, flattened disk. It is also probable that the lens which in figures 923. i„ is erect is 

 here thrown down against the contracted melanosome. 



The small spherical cyst attached at the posterior end and filled with leucoplatysomes and 

 an erythrosome is e\'idently a fragment of the body enej-sted separately but still adherent to 

 the parent plasma. The extrusion of a food ball at the posterior margin might be the cause of 

 such a detachment and, because of the withdrawal of substance, of the dislocation of the lens also. 



DiMExsioxs. — ^Measurements of figures 92i-2 in parentheses. Length, h'T 

 (70, 59V; transdiameter, 54 (45, 50) z^; length of ocelhis in axis, 30 (13)/^; diam- 

 eter, 10-21 (25) M. 



OcciTREEXCE. — Schiitt (1895) gives no data, Init his material may have come 

 from the Bay of Naj)les or have been seen on tlie Plankton Expedition in the 

 Atlantic. 



Co:Nrp.\Kisoxs. — The possibility of two separate species being represented by 

 the two sets of figures (figs. 92i-2 and 92^-12) is not excluded, but in view of the 

 possible abnormality of the individual represented in the first group, as above 

 indicated, it seems best to leave these in statu quo and base the species on the 

 second group of figures with the interpretation of the others as divergent or 

 abnormal representatives. 



The species as thus defined is a member of the subgenus Pouchetia with 

 diffuse or non-integrated ocellus. It is, in fact, less integrated than any other 

 species of Pouchetia, being nearest to P. ponchefi, where the pigment is scat- 

 tered and the lens deeply lobed. The amoeboid pigment is less markedly de- 

 veloped in P. sulnigm (fig. 00, 6), P. aWa (fig. PP, 8), P. atra (5), and P. 

 purpiirata (3), in all of which are fine lines of granules forming a feebly de- 

 veloped network spreading from the central pigment mass. Segmentation of 

 the lens is evident also in P. alba, P. atra, and P. purpurata. in which there are 

 no black pigment processes, but instead scattered lines of red granules. 



The lack of extreme torsion in the intercingular region of the sulcus and 

 the diffuse structure of the ocellus are indications of a generalized or less ad- 

 vanced stage of development of this species, while the high differentiation of 

 the terminal loops of the sulcus points towards specialization. 



Syxoxy:my. — This species includes tentatively all of the forms figured Ijy 

 Schiitt (1895) and, by implication resulting from the citations by the authors 



