446 MEMOIRS OF THE UNIVERSITY OF CALIFORNIA 



Synonymy.— Pavillard (1905, p. 47) cites it tentatively as a synonym of 

 Pouclietia nigra (Pouebet) Lemmermann (1899). This allocation seems to us 

 untenable since the course of the girdle and sulcus in the two species is whoUy 

 diftei-ent. Moreover, the ocellus of Protopsis )iigra (Pouehet) Kofoid and 

 Swezy is of the diffuse tjj)e, while that of P. juno is an integrated one and 

 higldy specialized. In addition Protopsis nigra is a small species, length 74/^, 

 while Pouclietia juno is a large one, 125-141/1 in length. 



Pouchetia maculata sp. nov. 



Plate 11, figure 119 ; text figures T, 2 ; PP, 12 ; QQ, 1 



Diagnosis. — A small species, ovoidal, wider anteriorly, length 1.3 trans- 

 diameters; girdle a descending left spiral of 1.5 circumference; ocellus post- 

 median, horizontal, with segmented elongated lens and a black melanosome with 

 a lighter central core. Length, 53m to 58m. Pacific off La Jolla, California, 

 July. 



Description. — The body is ovoidal, somewhat flattened laterally and contracting posteriorly, 

 irregular in outline owing to the projecting lobes between furrows on the ventral face. Its 

 widest diameter is found some distance above the middle of the body plane. The epicone and 

 hypocone are subequal. The epicone is very broadly rounded, having a length above the anterior 

 pore of 0.3 and from its posterior extremity of 0.8 of the total body length. The apex is flaring 

 hemispherical. The hypocone is very deeply cleft on the ventral side of the sulcus, the inter- 

 vening ridges of which may be more or less pronounced. The antapex is broadly rounded and 

 not cleft by the sulcal notch. There is an antapical process, more or less pushed anteroventrally, 

 which lies at the right of the longitudinal flagellum. It is variable in form in different aspects 

 and diifers in the two individuals under observation. It is probably somewhat mobile and may 

 represent the first step in the evolution of the tentacle as developed in Erythropsis. In one of 

 our specimens (pi. 11, fig. 119) it is a short rounded lobe projecting posteroventrally near the 

 ocellus at the right of the flagellum. Its diameter in an obliquely lateral view is a little more 

 than its length, which is 0.14 transdiameter. Its dorsoventral extension is thus not great 

 (fig. QQ, 2). On the other hand, this antapical process is more posterior in location, and has a 

 much greater extension as a long ridge or crest more than twice as long as it is wide or high. 

 It terminates abruptly on the dorsal and median faces. It is possible that there is a posterior 

 loop of the sulcus around this process. 



The girdle joins the sulcus anteriorly at a point 0.3 and posteriorly O.S of the total length of 

 the body from the apex. It passes in a semicircle around the body before the descending left 

 spiral steepens sharply in its distal quadrant. It makes 1.5 turns before meeting the sulcus 

 distally at a point about 0.2 of the total length of the body from the antapex. The total dis- 

 placement is 0.5 total length of body or 0.68 transdiameter. For most of its extent it is deeply 

 embedded, the proximal border forming an overhanging ridge. On the ventral side this becomes 

 more pronounced and is shown on both borders. The anterior flagellar pore is located at its 

 anterior and the posterior pore at its posterior junction with the sulcus. The transverse 

 flagellum traverses 0.3 of its total length. Tlie longitudinal flagellum equals or exceeds the 

 length of the body in length. 



The sulcus forms a slight loop around the right face of the epicone, taking its origin at the 

 left of the apex. It descends posteriorly, sweeping around nearly 0.5 of a turn before meeting 

 the girdle distally, beyond whicli it turns to tlie right as a very deep groove, the proximal border 



