364 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



chambers on either side of the median line near the orifice, the mandibles 

 directed outward. Other subsidiary avicularia may be present. Frontal 

 wall usually with a central smooth imperforate area, often greatly 

 reduced, surrounded by concentric rows of irregular tube-like pores" 

 (Brown, 1949:517). Genotype Lepralia mucronelliformis Waters, 

 1899. 



The description of the genus, as originally drawn by Canu and 

 Bassler, is incorrect in a number of points and was evidently compiled 

 from a number of species, some of which must belong elsewhere. Brown 

 has carefully restudied type material of mucronelliformis and found the 

 ovicell, which was overlooked by Waters; it is merely recumbent and 

 not embedded, perforated and is definitely closed by the operculum, per- 

 fectly plain without the lunar crescents described by Canu and Bassler. 



Hippomenella flava new species 

 Plate 43, figs. 7-9 



Zoarium encrusting, small, yellowish. Zooecia rather regular in 

 arrangement, little inflated, separated by distinct grooves; moderate in 

 size, 0.55 (0.45 to 0.70) mm long by about 0.40 mm wide, but some- 

 times broader than long. The frontal is a smooth pleurocyst when young 

 and later bears low smooth ridges and bosses but there is no trace of an 

 umbo; a row of moderately large areolar pores (often with 2 rows or 

 even 3 toward the distal end) ; the inner pores carried upward on the 

 imperforate central area in advanced calcification. The aperture is longer 

 than wide (0.15 by 0.12 mm), rounded distally, nearly straight on the 

 sides, with strong cardelles proximal to which is a wide shallow poster; 

 the poster has a wide shallow sinus (?) of varying form, often wanting. 

 The operculum does not conform to the proximal "sinus" but is nearly 

 transverse on its proximal border; well chitinized, yellow, with a broad 

 sclerite well within from the border. The peristome is thin, smooth, 

 wanting on the proximal border, and bears about 6 slender spines. 

 The avicularia are long-pointed, located at one or both sides of the 

 proximal end of the aperture, or sometimes more proximally, directed 

 outward and backward ; the mandible very slender, varying in length 

 from 0.20 to 0.50 mm, with a complete pivot bar. 



The ovicell is globose, closed by the operculum, smooth and shining, 

 marginated around the base, perforated by numerous small pores ; 0.30 

 mm wide, and the first oral spine on each side is not covered by the 

 ovicell. 



