786 MISS HELEN PIXELL ON 



The third point of difterence given by Bush is that S'. Colum- 

 biana has moie numei'ous branchiae — 54 in each lobe as given 

 by Johnson — than her aS'. splendens, for which she records 45 to 

 50 pairs. 



In the specimen of the former species counted by Moore (19) 

 there were only 38. One small specimen of mine had only 18, 

 but the general number was from 30 to 50 on each side, one or 

 two large specimens having as many as 54 — the number given 

 by Johnson. These facts show cleaiiy I think that S. splendens 

 is a quite unnecessary species and can be included in S. columhiana,. 

 which in turn, as pointed out by Johnson (9. p. 433), may be 

 identical with S.jukesii Baird, for which however no satisfactory 

 description was given. 



Numerous large free Selenidia in the trophozoite stage wei'e 

 found in the alimentary canal of nearly every specimen of 

 S. Columbiana examined. 



Genus Crucigera Benedict (1), 1886. 



Generic characteristics : — 



1 . Collar setae and uncini similar to those of Serjnda. 



2, Operculum with comparatively few i-adii forming a scalloped 



margin to the funnel and with conspicuous basal pro- 

 cesses. 



2. Crucigera zygophora Johnson. (PI. LXXXVII. fig. 2.) 



Serpida zygophora Johnson (9), 1901. 

 Crucigera zygop)hora Bush (3), 1905. 



Specific characteristics : — 



1. Branchise about 30 pairs with long filamentous ends to 



rachises. 



2. Opercu.lum thick, shallow, with about 30 radii and 3 rounded 



processes at its base ; attached by a long pedicle. 



One specimen from Puget Sound was 45 mm. long. A smaller 

 incomplete specimen came from Victoria (fig. 2). Another 

 specimen was only 7 mm. long and had a much thinner operculum ^ 

 but seemed otherwise similar. 



3. Crucigera irregularis Bush (3), 1905. (PI. LXXXVII. 



fig. 3.) 

 Specific characteristics : — 



1. Branchiae much coiled and with comparatively short fila- 



mentous ends to rachises. 



2. Operculum irregular, apex of funnel displaced ventrally and 



the posterior and latei"al walls deeper and rolled over to 

 some extent. Not more than two basal processes which 

 may, however, be bi-lobed and attached by long stout 

 pedicle (fig. 3). 

 About 1 2 specimens from the Channel outside Departure Bay 



