NO. 3 OSBURN: EASTERN PACIFIC BRYOZOA CYCLOSTOMATA 715 



short uniserial connate rays, the size and form of the zooecial apertures, 

 and the size, form and nature of the closure of the cancelli. It is very 

 different from any other Eastern Pacific species, but it may represent 

 some of the too numerous lichenoporid species that have been inade- 

 quately described from all around the world. 



Type, AHF no. 126. 



Type locality, Hancock Station 432, Tagus Cove, Albemarle Island, 



Galapagos, 80 to 100 fms, two colonies, with ovicells. Also 1662-48, 



Santa Cruz Island, 33°55'45'''N, 119°32'30''W, southern California, 



23 fms ; and one colony from Colombia without further data. 



Disporella alaskensis new species 



Plate 75, figs. 7 and 8 



The zoarium is round, 3 mm in diameter, high at the central area, 

 the broad cancellated thin border turned up all around, shaped like a 

 miniature Mexican straw hat; attached over most of the dorsal surface. 

 The radii are multiserial (2 to 4), consisting of elevated ovoid clumps 

 which are regularly arranged about the central area. The outer ends 

 of the radii descend sharply to the thin bordering lamella. In our two 

 specimens, the smaller has 4 radii with 2 developing between these at 

 the edges, the larger has 8 rays with several smaller incomplete ones. 

 The tubules are completely connate to their tips, which are not extended 

 into points, the apertures rounded or slightly hexagonal and about 0.10 

 mm in diameter. 



The central area is moderate in size, short-ovate in form, with large 

 rounded cancelli (0.13 mm) and the cancelli of the bordering area are 

 of the same size and form (occasional smaller ones are present on the 

 central area and between the radii) ; there are 2 to 4 rows of cancelli 

 between the radii. Small pinhead spicules are present. There is very 

 little closure of the cancelli of the central area, just enough to suggest 

 an "iris-like" diaphragm, and the bordering cancelli are wide open. 



A small sub-colony is present on the front, situated at the outer end 

 of one of the rays and well within from the border; this has the same 

 form, with edge strongly turned up and the tubules and cancelli similar 

 to those of the primary colony. 



The ovicell is interradial, extending somewhat into the central area 

 and covered by a thin membrane with minute pores. Unfortunately the 

 ooeciostome is broken away. 



Type, U. S. Nat. Mus. no. 11052. 



