66 UniversHij of California Publications in Zoology [Vol.16 



Our figures are made from one of the smaller (55;u), stouter vari- 

 eties. Had they been made from a more slender one such as Brandt's 

 D. templum var. /. or his var. g. gi-andis the resemblance to D. tiara 

 would doubtless be more striking than in our figures. 



2. ON PETALOTRICHA ENTZI SP. NOV. 



In the course of a revision of the geniLS Petalotricha Kent there 

 have come to our attention two figures assigned among others by Entz, 

 Jr. (1905, p. 131. figs. 30-32) to Petalotricha ampulla (Pol) Daday. 

 These figures differ so strikingly from the others of this species repro- 

 duced in Entz's paper and from material in our hands of this and 

 all known species of the genus that their separate characterization as 

 a distinct species seems desirable. These figures also differ from all 

 published accounts and figures of species of Petalotricha or related 

 Tintiunoina. 



Entz's figures of this form here described as new and of Petalo- 

 tricha ampulla ampulla (Pol) Kent from the Adriatic at Quarnero 

 are here reproduced for comparison. 



Petalotricha entzi sp. nov. 

 Figures 4-6 



Diagnosis. — Lorica cup-shaped, its length equaling diameter to edge 

 of oral shelf, wall of nuchal region greatly thickened, aboral end hemi- 

 spherical, oral rim, edge of oral shelf and nuchal ledge serrate, lower 

 bowl with longitudinal .striae. Length, about lOO/n. Adriatic. 



Description. — Lorica flaring cup-shaped, rotund aborally, its length 

 1.28 oral diameters, equaling that of the oral shelf. Bowl, collar, and 

 oral shelf hidden externally by the thickening of the wall so that the 

 nuchal con.striction visible externally in all other species is here com- 

 pletely lest except for a slight nuchal concavity. The oral shelf thus 

 exposes only an upper surface which slopes downward towards the 

 lumen about 25° for about 0.11 oral diameter, where it meets the low 

 oral rim. Its upper surface is somewhat concave and fluted, each 

 ridge corresponding to a marginal serration on the edge of the oral 

 shelf and an inner but smaller one in the oral rim (fig. 6). There 

 are about 55 serrations in the circumference. Although the nuchal 

 constriction is masked externally, it has a well-defined internal ledge 

 which constricts the lumen to 0.8 the oral diameter and forms a shallow 



