EARLY TERTIARY CHEILOSTOME BRYOZOA. 67 



In 1900 Waters ^ discovered the larva of Phylactella. It is quite 

 distinct from all others in its form and its large dimensions, evidently 

 characterizing a special family. 



The special ovicell which Waters called recumbent is placed on the 

 distal part of the zooecium itself, between the apertura and the distal 

 zocecium. Viewed laterally it appears attached like a sack on the 

 back of a porter. Evidently it is also more or less supported on the 

 distal zocecium, but frequenty it is completely separated from it. 

 In its form, position, and large opening it is eminently adapted to 

 the size of the larvae. 



Genus PHYLACTELLA Hincks, 1880. 



1880. Phylactella Hincks, British Marine Polyzoa, p. 356. 



The apertura is more or less circular; it bears either a lyrule or 

 some cardelles. The thick band of the operculum is at a small dis- 

 tance from the edge. The apertura is surrounded by a peristomie 

 more or less funnel shaped. The peristome is interrupted distally and 

 replaced by a small tongue. The frontal is a tremocyst with very 

 fine pores. No spines. 



Genotype. — Phylactella lalrosa Busk, 1852. 



Range. — Jacksonian-Recent. 



In addition to the one here described three new species have been 

 determined in the Early Tertiary rocks of the Carolinas and Ala- 

 bama. 



PHYLACTELLA INFUNDIBULUM, new species. 

 Plate 6, fig. 2. 



Description. — The zoarium incrusts other bryozoa. The zooecia 

 are large, distinct, elongated, oval ; the frontal is quite convex ; it is 

 formed of a tremocyst with very small pores separated from each 

 other by fine granules. The apertura is formed of a large semicir- 

 cular anter, separated by two small cardelles from a very concave pos- 

 ter ; the peristome is long, tubular, depressed in front, and interrupted 

 behind by a wide distal tongue ; the peristomie forms a sort of funnel 

 around the apertura.. The ovicell is large, salient, globular, finely 

 porous and granular; it is hyperstomial, recumbent, and opens into 

 the peristomie. 



. k 1. \ A«=0.16 mm. 

 MeasureTnents. — Apertura , r> i r> a i t 



^ [ Za=0.16-0.17 mm. 



Z2=1.25 mm. 



Zoceciai , „ „„ 



^^=0. <2 mm. 



This superb species is, unfortunately, quite rare. 



' 1900. Waters, Bryozoa from Franz Josef Land. Journal Linnean Society Zoology, 

 London, vol. 28, p. 90, pi. 12 figs. 8, 4. 



