24 BULLETIN 16 5, UNITED STATES NATIONAL MUSEUM 



Genus ALLANTOPORA Lang, 1914 



ALLANTOPORA IRREGULARIS Gabb and Horn, 1860 



Plate 4, Figukb 6 



1860. Hippothoa irregularis Gabb and Horn, Proc. Acad. Nat. Sci. Philadel- 

 phia, vol. 12, p. 366. 



1907. Pyripora irregularis Ulbich and Bassler, in Weller, Geol. Surv. New 

 Jersey, Paleontology, vol. 4, p. 337, pi. 24, fig. 5 (bibliography). 



1914. Allantopora irregularis Lang, Geol. Mag., ser. 6, vol. 1, p. 437, pi. 34, fig. 1 

 (bibliography). 



Description. — The zoarium encrusts other Bryozoa (Coscinopleura, 

 Pliophloea, etc.) and is uniserial, ramified. The zooecia are robust 

 pyriform, large; the gymnocyst is strongly convex, smooth, very 

 narrow posteriorly; the termen is thick and bears minute granules 

 and four or five pairs of large hollow spines. The opesium is broad, 

 subelliptical in outline, situated anteriorly. The ovicell is hyper- 

 stomial, not closed by the operculum, globular, smooth. 



Measurements. — 



. 1X3 = 0.8-0.9 mm. ~ . 1^ = 0.4-0.45 mm. 

 Zooecia j fe =Q ^ mm Opesmmj^ =a2M>25 mm> 



Structure. — This pretty species was chosen by Lang in 1914 as the 

 type of his genus Allantopora. The description he gave is incom- 

 plete, for he did not describe the ovicell. It is hyperstomial; its 

 orifice cannot be closed by the opercular valve. 



Two recent species of this genus have been discovered in the 

 equatorial zone. One of these, Allantopora translucens Harmer, 

 1926, bears long articulated spines, so that we are correct in inter- 

 preting as hollow spines the minute cicatrices that occur on the 

 termen. Their presence is possibly not a generic character. Har- 

 mer's species, which is from Malaysia, was dredged between 75 and 

 94 meters. Allantopora curta Canu and Bassler, 1929, from the 

 Philippines occurred at two localities, at depths of 176 meters and 

 386 meters. The genus appears to be one of deep water. To judge 

 from these, the Vincentown marl fossils may then have been de- 

 posited at a depth of 90 meters at least, with a temperature perhaps 

 of about 20° C. We have observed regenerated zooecia. Besides 

 the above, other representatives of the genus are Allantopora sto- 

 matoporoides Lang, 1914 (Danian), A. senoniensis Voigt, 1930 

 (Senonian), and in addition some multiserial species. 



Occurrence. — Vincentown limesand: Timber Creek and Mullica 

 Hill, N.J. (Gabb and Horn) ; somewhat rare at Vincentown and 

 near Blackwoodstown, N.J. 



Plesiotypes.—U.S.'NM. Nos. 52615, 73860. 



