408 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



Genus SMITTOIDEA new genus 



The frontal is a granular pleurocyst, surrounded by a row of con- 

 spicuous areolar pores which are separated by short costal ridges. There 

 is a median suboral avicularium, enclosed within the peristomial sinus 

 fold or proximal to it. Lyrula and cardelles well developed. The ovicell 

 is hyperstomial and perforated by numerous, evenly distributed pores. 

 Genotype, Smittoidea prolifica Osburn, new species. 



Key to Species of Smittoidea 



1. Avicularium with a long-pointed mandible which is directed back- 



ward and located proximal to the peristome .... reticulata 

 Avicularium enclosed by the sinus fold of the peristome ... 2 



2. Avicularium with a semicircular mandible directed more or less 



vertically prolifica 



Avicularium with a pointed mandible which is directed laterally, 

 more or less enclosed by the sinus fold of the peristome transversa 



Smittoidea prolifica new species 

 Plate 48, figs. 7-8 



Smittia reticulata, Robertson, 1908 :306. 



Zoarium small, white, encrusting on stones, shells and stems. The 

 zooecia are of moderate size, 0.40 to 0.50 mm long by 0.25 to 0.30 mm 

 wide, ovate or irregularly hexagonal, somewhat swollen and very distinct. 

 The frontal is a pleurocyst, smooth when young but becoming granular 

 with age; a single row of rather large areolar pores and between these 

 are distinct short ribs which run part of the way toward the center. The 

 primary aperture is nearly circular, rounded distally and on the sides 

 and straighter on the proximal border, about 0.13 mm wide by 0.12 mm 

 long; the lyrula large, its tip transverse and the angles usually extended 

 laterally; the cardelles strong, pointed. The peristome rises sharply on 

 the sides, descending to the distal border where there are 2 to 4 evanescent 

 spines ; proximally the peristome forms a somewhat quadrate sinus which 

 encloses the suboral avicularium. The avicularian chamber is low and 

 small and connected on each side with an areolar pore by a narrow 

 tubule, the rostrum is somewhat elevated and bears a small rounded 

 avicularium and often partially obscures the lyrula. Frontal avicularia 

 are wanting. 



