ART. 14 FOSSIL AND RECENT BRYOZOA CANU AND BASSLER 109 



Hippomenella abundant in the American Eocene. It is, unfortunately, 

 very rare. 



Biology. — Our specimen was dredged living and was in reproduc- 

 tion and fixation March 15, 1885. 



Occurrence. — Albatross Station D. 2405, Gulf of Mexico; 28° 45' 

 00" N.; 85° 02' 00'' W.; 30 fms.; gray sand, broken coral. 



Eolotype.— Cat. No. 7516, U.S.N.M. 



Genus LEPRALIA Johnston, 1847 



LEPRALIA PALLIOLATA, new species 



Plate 12, Figure 11; text Figure 20d 



Description. — The zoarium encrusts fragments of shells; the zo- 

 oecia are distinct, separated by a deep furrow, elongated, elliptical; 

 the frontal is quite convex, smooth, formed of two superposed cal- 

 careous lamellae. The aperture is small and formed of a large semi- 

 circular anter separated by two cardelles from a wider poster with 

 concave proximal border. The ovicell is hyperstomial, never closed 

 by the operculum, globular, smooth; it is formed by two calcareous 

 lamellae of which the superior one is incomplete and limits a small 

 frontal cicatrix. The ancestrula is very small. There is a small 

 avicularium in front of the aperture. 



Ttr J A ^ fAa = 0.09 mm. 



Measurements. — Aperturei, 



^ l?a = 0.08 mm. 



fi2: = 0.50 mm. 



Zooecial, ^ _„ 



lfe = 0.30 mm. 



Structure. — The structure of this charming specimen is unusual. 

 The aperture as well as the small avicularia perforates the interior 

 lamella of the frontal. 

 The exterior lamella 

 almost entirely covers the 

 frontal without burying 

 the avicularmm, bears ^j^ 2o.-opeecula of miceoporella. a. miceopokella 



spines, and forms on the ciliata Linnaeus, 1758. B, C. Miceoporella ampla, 



adult ZOOecia a kind of ""cZJ^f^T^ S^ ^^^^^"'"^ palliolata, new species. 



Opeeculxjm, X 85 



false peristome at the bot- 

 tom of which the aperture and the avicularium are placed. The 

 zooecium appears thus to be covered with a kind of small mantle. 

 The structure of the ovicell is identical; the exterior lamella is in- 

 complete and forms a small linear frontal cicatrix. 



It is very difficult to classify this species. The presence of the 

 oral avicularium and the vanna larger than the porta are characters 

 nonexistent in Hippoporina. Moreover, we are ignorant of the struc- 

 ture of the interior lamella. We have found only three specimens of 

 this species, one of which has served in the preparation of the opercu- 

 lum; we are not able then to continue the study. The operculum is 

 divided into two parts and bears no muscular attachments. 



