^HT. 14 FOSSIL AND EECBNT BEYOZOA CANU AND BASSLEB 137 



these are always placed symmetrically below the aperture. The fig- 

 ures of Savigny and Norman agree perfectly in showing this essential 

 character. On our fossil specimens from Panama the vibracula are 

 rarely placed at the same height. Almost always there is one more 

 removed from the aperture, but both are always below the aperture 

 as in the type. 



In the two other species from the Gulf of Mexico, G. setigera Smitt, 

 1873, and G. longiseta, new species, the vibracula are placed on each 

 side of the aperture. 



Occurrence. — Madeira, Hawaiian Islands, etc. (type form). 



Pliocene ; Minnitimmi Creek, Bocas Island, Almirante 

 Bay, northwest Panama. 



Holotype—Csit. No. 70835, U.S.N.M. 



Family PHYLACTELLIDAE Canu and Bassler, 1917 



Genus LAGENIPORA Hincks, 1877 



LAGENIPORA VERRUCOSA, new species 



Plate 21, Figures 5-8 



Description. — The zoarium encrusts shells, nuilipores, corals, and 

 hydroids; the zooecia are arranged in uniserial lines more or less 

 ramified. The zooecia are long, lageniform; the frontal is convex, 

 verrucose, and terminated by a long cylindrical smooth peristome. 

 The aperture is orbicular and buried at the bottom of the peristome; 

 the peristome is thin, entire, or notched. The ovicell is small, glob- 

 ular, opening into the peristome above the operculum. 



Measurements. — Diameter of peristome = 0.20 mm. 



\Lz = 0.55 mm. 



Zooeciau „ ^„ „ „^ 



Us = 0.30-0.35 mm. 



Structure. — This curious species is rather variable. There are some 

 very verrucose zooecia and others which are almost smooth. The 

 length of the peristome depends upon its position on its substratum. 

 The branches are irregular in their divergence ; they have a tendency 

 to approach each other and the cells group themselves sometimes in 

 the manner of cellepores, but without ever surmounting each other. 



Aijinities. — Lagenipora edwardsi Jullien, 1882, is also uniserial, but 

 our species differs in its smaller zooecia and its long peristomes. 



Biology. — This is a species of the coral bottoms and of submarine 

 currents; it descends to rather great depths. It is fond of small 

 round bodies for a substratum and it twists about them in all direc- 

 tions. The choice made by the larva is a beautiful manifestation of 

 their instinct. The photography of the colonies thus fixed is very 

 difficult. 



