NO. 1 OSBURN: eastern pacific BRYOZOA CHEILOSTOMATA 143 



cate that the frontal avicularia are differently distributed; there are no 

 vibracula, but occasional radicle chambers occur in the usual position, 

 and joints are usually absent. In profundis the joints are normally de- 

 veloped, the dorsal vibracula regularly present and the axial ones twined. 



Type, AHF no. 36. 



Type locality. Albatross Expedition to Lower California, 1911, Sta- 

 tion 5682, off San Lucas Bay, Lower California, 22°48'20"N, 109°52' 

 40"W,491fms. 



Scrupocellaria pugnax new species 

 Plates 17, fig. 4, and 21, fig. 5 



Zoarium erect with slender branches, the joint involving the proximal 

 border of the opesia of the outer zooecium, internodes with 4 to 7 zooecia 

 in a series. 



The zooecia are slender, about 0.50 mm long by 0.14 mm wide and 

 narrowed to about 0.08 mm at the base, the outer border nearly straight. 

 The opesia is regularly elliptical, 0.18 mm long by 0.10 mm wide, the 

 cryptocyst finely granulated. The spines are well developed, 2 or 3 outer 

 and 1 or 2 inner. Lateral avicularia appear to be entirely wanting. On 

 every zooecium, immediately proximal to the opesia, is a large salient 

 avicularium, the chamber somewhat bulbous, the rostrum elongated and 

 directed forward and outward over the base of the opesia, both rostrum 

 and mandible hooked. The avicularium resembles that of S. ferox Busk, 

 but is smaller and less elevated. The vibracular chamber is large and 

 prominent, visible for half of its length from the frontal aspect, its groove 

 longitudinal ; the seta strong and about twice the zooecial length. The 

 radicle chamber is at the proximal-lateral side and included in the out- 

 line of the avicularian chamber; the radicles numerous, without serra- 

 tions, about 0.04 mm in diameter. The axial vibraculum is similar in 

 size and form to the lateral ones. There is no evidence of a scutum. 



While the large, transverse avicularia of S. pugnax suggest S. ferox 

 Busk, the latter species has only vestigial spines, the opesia is pointed oval 

 in form, the radicles are serrated and the zooecia are shorter and wider. 



Type, AHF no. 37. 



Type locality, Hancock Station 451, Post Office Bay, Charles Island, 

 Galapagos, at 60 fms, one colony without ovicells. 



