416 



MEMOIRS OF THE UNIVERSITY OF CALIFORNIA 



foiiud iu association with the primitive or Gym nodi n'lum- or G 1/ rod iui urn -like 

 condition of sucli fundamental structures as tlie ordinal characters, the sulcus 

 and the girdle. This genus differs from Pouchetia in the absence of apical loop 

 of the sulcus, lack of torsion, and short intercingular region of the sulcus. It 

 differs from Ertjtliropsis in the lack of apical loop, paradinial lines, tentacular 

 recess and tentacle. It is plamly the least specialized genus of the Pouchetii- 

 dae. It is noteworthy that within this genus, as also in Pouchetia and Eri/th- 

 ropsis, there are two lines of differentiation, namely, into the compound and 

 simple Xypen of ocellus. Speciation has followed parallel courses in the three 

 genera. 



Fig. LL. Frotopsis gen. nov. 1. P. nigra (Pouchet). After Pouchet (1887, pi. 10, fig. 2 A). 2. P. neapoli- 

 *a7ia Kofoid. 3. Same rounding up. 4. P, ocftreo (Wright). After Wright (1907, pi. 1, fig. 8). X 500. 



Kfa" to the Species of Protopsis gex. xov. 

 1. Ocellus diffuse ; 2 



1. Ocellus concentrated, with single campanulate lens, no scattered peripheral pigment 



ochrea (Wright) 



2. Ocellus with 4—6 spheroidal lenses, ragged melanosome and scattered pigment in periplieral 



plasma nigra (Pouchet) 



2. Ocellus with single lens, melanosome composed of a cluster of granules 



neapolitana sp. nov. 



Protopsis neapolitana Kofoid MSS. 



Plate 9, figure 96 : text figures LL. 2, 3 



Diagnosis. — Small species, body ovoidal, its leug-th 1.45 transdiameters ; 

 apex pointed ; girdle a steep descending left spiral, displaced 0.68 total length ; 

 ocellus centrally located, lens subovoidal. flattened against small melanosome 

 composed of clustered granules and 0.5 diameter of lens; plasma almost color- 

 less ; holozoic. Length, about 50/^. Mediterranean at Naples, January. 



Description. — The body is ovoidal, slightly wider posteriorly, its length 1.4.5 transdiameters 

 at the widest point which is postequatorial. The epicone is exceeded by the hypocone by 0.25 

 length of the hypocone. Its length at the proximal and distal ends of the girdle is 0.09 and 

 0.67 total length respectively. The apex is rotund subeonical, about 80° distally, rounding 

 almost to subhemispherical under the stimulus of strong light. The hypocone has a length of 

 0.91 and 0.33 total length at its anterior and posterior ends of the girdle respectively and the 

 antapex is almost hemispherical with no suleal notch. 



