NO. 2 OSBURN: eastern pacific BRYOZOA — CHEILOSTOMATA 489 



Lagenipora hippocrepis (Busk), 1856 

 Plate 60, figs. 5-6 



Lepralia hippocrepis Busk, 1856:177. 

 Costazia hippocrepis, Hastings, 1930:731. 



Zoarium encrusting on shells and stems. The zooecia are moderate 

 in size, 0.55 to 0.65 mm long by 0.30 to 0.40 mm wide, slightly inflated 

 (Busk says "Cells immersed," but the separating grooves are always 

 quite distinct), with large tremopores. The primary aperture is ovoid 

 and slightly sinuate on the proximal border, 0.14 mm long by 0.12 mm 

 wide. The peristome is inclined forward, less erect than most other 

 species of the genus, low to moderately high on the proximal border, 

 lower distal to the avicularia, smooth or with slight striation, the rim 

 smooth without any evidence of spines or other processes. The avicularia 

 are at the level of the peristomial rim or they may be considerably ele- 

 vated above it, their short-triangular mandibles directed laterally. 



The ovicells are situated at the base of the peristomes, but they open 

 into the peristome well above the primary aperture- hemispherical in 

 form; "A thin unpunctured hood invests the anterior part, and there 

 is sometimes a semicircular plain area above the lip, outlined with a 

 ridge" (Hastings). The perforated area is similar to that of other species 

 of the genus. 



Busk described the species from Mazatlan, Mexico. Dr. Hastings 

 recovered it again from the Galapagos after more than 70 years and 

 compared her specimens with Busk's type. In my opinion the species does 

 not belong in the genus Costazia and the tremocystal frontal with 

 numerous evenly distributed pores, the lack of special areolar pores, and 

 the nature of the ovicell which opens into the peristome well above the 

 primary aperture are all characters of Lagenipora. 



Hancock Stations: 430, Wenman Island, Galapagos, 150 fms; 1050, 

 San Miguel Island, southern California, 34 fms; a specimen from the 

 Gulf of Panama (Bradley coll.), and another from Redondo Beach, 

 California, along shore. 



Lagenipora marginata Canu and Bassler, 1930 

 Plate 59, fig. 9 



Lagenipora marginata Canu and Bassler, 1930:36. 



Zoarium encrusting shells, coralline and dead Discoporella umbellata, 

 with narrow linear branches of one to three series of zooecia. The zooecia 

 are lageniform, about 0.60 mm long by 0.35 mm wide, inflated, with 

 numerous small tremopores. The peristome is moderately high, occa- 



