484 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



Genus LAGENIPORA Hincks, 1877 



Hincks' description is meager and inadequate: "Colonies consisting 

 of a number of cells immersed in a common calcareous crust. Zooecia 

 decumbent, contiguous, lageniform ; oral extremity free, tubular, with 

 a terminal orbicular orifice." Genotype, Lagenipora socialis Hincks, 

 1877:214. 



There has been much misunderstanding in regard to this genus, 

 possibly from the failure to consider the nature of the various characters 

 which difiFerentiate it from Costazia, with which it has been most fre- 

 quently confused. The writer has had the privilege of studying seven 

 species which present the same general characters: L. socialis Hincks 

 (the genotype), L. spinulosa Hincks, L. punctulata (Gabb and Horn 

 = L. erecta O'Donoghue), L. marginata Canu and Bassler, L. lacunosa 

 Bassler, L. verrucosa Canu and Bassler, and L. hippocrepis (Busk). In 

 all of these the following assemblage of characters is presented : zooecia 

 lageniform (flask-shaped), the zooecial body entirely decumbent; a 

 tubular peristome of variable height erect or semierect ; the frontal a 

 tremocyst with numerous conspicuous pores evenly distributed over the 

 surface ; a pair of small lateral-oval avicularia at the rim of the peristome 

 or extending above it ; absence of frontal avicularia ; a hemispherical 

 ooecium on the distal side of the peristome, high above the base or lower 

 down but always opening into the peristome well above the primary 

 aperture, its upper surface with a finely perforated area. 



In Lekythopora MacGillivray, which has somewhat the same manner 

 of growth, the ovicell is borne upon the proximal side of the peristome 

 and the frontal pores are few. In Costazia Neviani (Siniopelta Levinsen) 

 the zooecia are erected, the frontal provided with enlarged areolar pores 

 and the aperture is more or less sinuate, also frontal avicularia (sometimes 

 interzooecial) are present and the perforated area of the ovicell presents 

 a diliferent picture. 



Key TO Species of Lagenipora 



1. Zoarium erect and branching from an encrusting base .... 2 

 Zoarium encrusting at all stages 3 



2. Zoarium rough, zooecia large (av. 0.70 mm long), coarsely 



punctate, peristome high and costate punctulata 



Zoarium smoother, zooecia smaller (av. 0.55 mm long), pores 

 smaller, peristome lower and smooth mexicana 



