326 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



is always broader than the anter. This latter species now very well 

 known from the work of Calvet, 1900, becomes the type of our new 

 genus Cryptosula. We class it in the Escharellidae because of the 

 nature of its larva. 



There is no necessity for change in the genus Hippodiplosia. Its 

 genotype Lepralia pallasiana Hincks, 1880, is very rare and it is 

 unfortunate that a more common species was not chosen. The error 

 of synonymy made by Hincks, 1880, and by Jelly, 1889, is the cause 

 of the initial confusion which caused us to write Pallas, 1803, instead 

 of Hincks, 1880. 



Genus HIPPOPLEURIFERA Canu and Bassler, 1927 



The ovicell is hyperstomial and is not closed by the operculum. 

 The frontal bears at least a double row of areolar pores separated by 

 radial costules. The cardelles are small. There are spines on the 

 peristome and zooecial avicularia in which the beak is always oriented 

 toward the top of the zooecia. 



Genotype. — Hippopleurifera (Eschara) sedgwicki Milne-Edwards, 

 1838. 



Range. — Miocene (Helvetian) — Recent. 



This genus differs from Eippomenella Canu and Bassler, 1917, in 

 the inverse orientation of the avicularia and in the absence of areas 

 on the ovicell. It differs from Umbonula Hincks, 1880, in the pres- 

 ence of two cardelles, in a strongly chitinized operculum, in the 

 presence of lateral avicularia and of rows of interareolar costules. 



The greater part of the time an oral mucro is much developed. It 

 has for its fimction the protection of the entrance of the compen- 

 satrix which is very large. When it does not exist, it is replaced by 

 a small avicularium in which the movements of the mandible have 

 the same function. 



The genus is well represented in the Helvetian and the Tortonian 

 of Europe. The genotype is from the English Pliocene but it is 

 more variable than the other species. 



HIPPOPLEURIFERA(?) PHILIPPINENSIS, new species 



Plate 38, fig. 5 



Description. — The zoarium encrusts bryozoa. The zooecia are 

 distinct, separated by a deep furrow, large, elongated, elliptical. 

 The frontal is very convex and is a smooth pleurocyst surrounded 

 by a double row of small areolar pores separated by short costules. 

 The aperture is suborbicular; the peristome is thin, salient, garnished 

 with 6 large distal spines. The zooecial avicularia are large, elon- 

 gated, the beak at the top, with two denticles for pivot. 



Affinities. — The figured specimen only, consisting of six zooecia, 

 has been found. The aperture and the dimensions are quite variable; 



