NO. 1 OSBURN : EASTERN PACIFIC BRYOZOA CHEILOSTOMATA 37 



In most of Its characters it resembles E. angulata Levinsen (1909: 

 149) from Siam, but that species has an evident cryptocyst, shorter, 

 simple spines, and lacks the extraordinary opercular decoration of an- 

 omala. 



Type, AH F no. 12. 



Type locality, Balboa, Canal Zone 8 colonies encrusting wood, the 

 largest 20 mm in diameter. The specimens were received from the W. F. 

 Clapp Biological Laboratories. 



Electra biscuta new species 

 Plate 3, figs. 7 and 8 



Zoarium thin, encrusting shells, the colonies small. 



Zooecia small (length 0.26 to 0.30 mm, width 0.18 to 0.22 mm), 

 distinct with well-marked grooves. The gymnocyst is usually very limited, 

 but may occupy one-fourth or more of the zooecial length; cryptocyst 

 narrow, not expanded, smooth or finely granulated; the mural rim low, 

 thin and slightly granulated. The distal wall is strongly arched forward 

 on the dorsal side. 7 he opesia is irregularly ovate, straighter on the 

 proximal border and conspicuously narrowed in the region of the opercul- 

 um ; occasionally more elliptical. 



The spines are heavy, broad at the base and without joints and are 

 of three kinds: (1) a broad spine, often cervicorn with three points, 

 sometimes only bifid or again simply broadened ; these are situated one 

 on each side of the operculum and when fully developed bend across the 

 opesia like a pair of scuta; (2) just distal to these on each side is a short, 

 stout, conical, erect spine opposite the distal end of the operculum; (3) 

 on the g>'mnocyst immediately proximal to the opesia is a transverse 

 series of short, stout conical spines which project forward in a row at a 

 slight angle above the opesia, these usually number 3 or 4 but vary from 

 1 to 5 ; often their bases are more or less fused, and their tips often briefly 

 bifurcate. 



The generic relationship of this species is somewhat in doubt. No 

 ooecia have been observed and there are no avicularia. The communica- 

 tion pores are in the form of round multiporous rosette plates. The 

 absence of ooecia and avicularia and the presence of a gymnocyst, mural 

 spines and thin lateral and dorsal walls, without dietellae, suggest the 

 genus Electra, though there is little resemblance in appearance to any 

 others of that genus. 



Type, AHFno. 13. 



