NO. 2 OSBURN : EASTERN PACIFIC BRYOZOA — CHEILOSTOMATA 467 



This is the first record of the genus from the Eastern Pacific and 

 the first account of the mode of attachment. 



Type, AHF no. 100. 



Type locality, Station 450, 0°55'00"S, 90°30'00''W, Galapagos 

 Islands, 60 fms. Also at Stations 432 and 461, Tagus Cove, Albemarle 

 Island, Galapagos, 80 to 100 fms. 



Genus HIPPOPODINELLA Barroso, 1924 



Ovicell endozooecial. Operculum much contracted on the sides; 

 aperture elongate, the anter much larger than the poster which is short 

 and wide; the cardelles strong. The frontal is a tremocyst. Dietellae 

 are present. No avicularia. Genotype, Lepralia adpressa Busk, 1854. 



Hippopodinella adpressa (Busk), 1854 

 Plate 57, fig. 6 



Lepralia adpressa^nsk, 1854:82; 1856:178. 

 Hippopodinella adpressa, Barroso, 1924:6. 

 Hippopodinella adpressOj Hastings, 1930:729. 



Zoarium encrusting, sometimes multilaminar. Zooecia moderate in 

 size, averaging about 0.55 mm long by 0.40 mm wide; distinct but the 

 grooves not deep ; slightly inflated. The frontal is a tremocyst, the pores 

 similar to the areolar pores, slightly roughened or with radiating ribs. 

 The aperture is elongate, about 0.14 mm long by 0.10 mm wide; the 

 cardelles project strongly and the proximal part of the aperture is wider 

 than the distal part, transverse, with a slightly arcuate proximal border. 

 A very slightly raised peristome surrounds the whole aperture. Rarely 

 a minute avicularium is present near the aperture. No spines. The 

 general appearance is that of a very small Cryptosula pallasiana. 



Described by Busk from Chiloe, Chile, and later recorded by him 

 from Mazatlan, Mexico. Hastings lists it from the Galapagos Islands 

 and Coiba, Panama. 



Hancock Stations: Noted at 29 stations from Angel de la Guardia 

 Island in the Gulf of California, W. Mexico, Costa Rica, Panama, 

 Ecuador, and south to the Galapagos where it is a common species. 



