NO. 2 OSBURN : EASTERN PACIFIC BRYOZOA — CHEILOSTOMATA 473 



The numerous variations have been discussed by Waters (1909:151), 

 Hastings (1930:730) and Marcus (1937:119) but without the separa- 

 tion of any distinct species. The type (Hastings, pi. 15, fig. 98) has a 

 comparatively narrow^, rounded poster, and eastern and v^^estern Atlantic 

 specimens agree on this point ; some colonies from Colombia, Galapagos 

 and the Gulf of California have a rounded poster, v^^hile in others it is 

 shallow and nearly as wide as the anter. Two rather distinct varieties 

 are based on the nature of the aperture and the peristome. 



Variety labiosa (Lepralia atrofusca var. labiosa Hincks, 1886:269), 

 from the Arabian Sea, occurs also in the Caribbean Sea and at Santos 

 Bay, Brazil. The zooecia are somewhat smaller. The proximal border 

 of the peristome rises into erect and contorted lappets. 



Variety nigra (Pachycleithonia nigra Canu and Bassler, 1930:25), 

 from the Galapagos Islands, and later recovered by the Hancock Expedi- 

 tions at a number of localities as far north as in the Gulf of California, 

 is characterized by the broad shallow poster and the forward projection 

 of the frontal nearly to the condyles. But for the variation in the breadth 

 and form of the poster this might well be considered a distinct species. 

 All of the other characters, however, agree with the typical form. 



The species, in its various forms, has been reported from the Mediter- 

 ranean Sea, Red Sea, Arabian Sea, Indian Ocean, China Sea, Gulf of 

 Mexico, Caribbean Sea, South Africa, Brazil, and in the Eastern Pacific 

 from Mexico, Colombia and the Galapagos Islands. 



Hancock Stations: at 36 stations from the Galapagos Islands and 

 Colombia on the south to Angel de la Guardia Island in the Gulf of 

 Mexico. The variety nigra occurred at numerous stations about the Gala- 

 pagos Islands and north to Mazatlan, Mexico, along with the more 

 typical variety. 



Genus VELEROA new genus 



No ooecia; no avicularia; aperture rounded with a large rounded 

 sinus; operculum thick, without sclerites and with muscle attachments 

 remote from the border; frontal a tremocyst with numerous pores; the 

 zooecial cavity very deep ; lateral and distal walls with very numerous 

 uniporous septulae which are evenly scattered over the whole surface. 

 Genotype, Veleroa veleronis Osburn, new species. 



The aperture and the frontal surface are much like JVatersipora, 

 but the operculum lacks entirely the broad bordering sclerite and other 

 characters of that genus, and the muscle attachments are far removed 

 from the margin on a slightly more chitinized area. The great depth 



