620 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



The zoarium is adnate, uniserial except around the ovicell which has 

 a series of tubules on each side of it, branching more or less at right 

 angles. The branches are straight or curved, anastomosing when they 

 come into contact. The peristomes curve up from the adnate tubules, 

 becoming more or less erect, the diameter at the tip 0.15 to 0.18 mm, 

 that of the aperture 0.12 to 0.14 mm; the base of the peristome some- 

 what broader according to the amount of calcification. The distance 

 from one peristome to the next varies greatly, usually 0.40 to 0.50 mm, 

 but may be as much as 1.0 mm. The tips of younger peristomes are finely 

 reticulate; in older parts the peristomes and adnate tubules are irreg- 

 ularly roughened. 



The ovicell, first described and figured by Borg (1926:359), is simple, 

 the proximal end narrow, irregularly pyriform with small lobes extend- 

 ing between the peristomes at the sides. The ooeciostome is an erected 

 tube, shorter than a peristome, its tip free and the aperture circular. In 

 young ovicells the pore is a semicircular slit at the base of the peristome. 



It appears to be a widely distributed species in the northern hemi- 

 sphere, reported from the coasts of Europe from Norway to the 

 Mediterranean Sea; Cape Verde Islands (Norman) ; British Columbia 

 (O'Donoghue) ; Japan (Sakakura) ; and Waters listed it as a fossil 

 from New Zealand. 



Hancock Station 1316-41, off Santa Catalina Island, 45 fms; and off 

 San Pedro, southern California, on shells. 



Genus PROBOSGINA Audouin, 1826 



Peristomoecia Canu and Bassler, 1920:692. 



"The zoarium consists of multiserial elongate bands, which are simple 

 or branched, and are always flat and adnate. The zooecia are cylindrical 

 and narrow. The peristomes are flush with the surface of the zoarium, 

 or slightly raised ; and they are usually distributed irregularly, but are 

 occasionally quincuncial or in transverse linear series." (Canu and 

 Bassler, 1920:658.) Genotype, Proboscina Boryi Audouin, 1826:236. 



This genus differs but little from Stomatopora except in biserial-multi- 

 serial disposition of the zooecial tubules. It is true that the zoarium 

 begins with a single series of tubules, but this soon becomes expanded 

 into two or more series, while in Stomatopora the expansion is limited 

 to the area immediately around the ovicell. The mode of branching is 

 much the same except that in Proboscina the origin of the branch is 

 usually at least biserial while in Stomatopora only a single tubule is 

 involved. 



