Bryozoa 11d 



Porella acutirostris Smitt 



King George sound, Hudson strait, Ungava, Diana Expedition, Sept. 9, 

 1897, 40 fathoms, one colony with ovicells, on a dead shell. 



Porella cotnpressa Sowerby 



King George sound, Hudson strait, Ungava, Diana Expedition, Sept. 9) 

 1897, 40 fathoms. Two small colonies, one erect to a height of 5 mm., on a 

 barnacle. 



Porella patula (M. Sars) 



Off Cockburn point. Dolphin and Union strait, C.A.E. Station 43a, 100 

 meters, Sept. 13, 191.5. One minute, but heavily calcified colony on a shell. 



Cysticella saccata (Busk) 



Lat. 70° 24' N., long., 161° 25' W., C.A.E. Station 23, 9 to 10 fathoms, 

 Aug. 19, 1913, several young, unbranched colonies, about 5 to 8 mm. high, 

 attached to a complex hydroid. Off Cockburn point, Dolphin and Union 

 strait, C.A.E. Station 43a, 100 meters, Sept. 13, 1915, several fragments. 



King George Sound, Hudson strait, Ungava, Diana Expedition, Sept. 9, 

 1897, 40 fathoms. One colony on a barnacle. 



Cylindroporella tubulosa (Norman) 



Off Cockburn point, Dolphin and Union strait, C.A.E. Station 43a, Sept, 13 

 1915, 50 fathoms. One young colony on a shell. 



Lepraliella contigua (Smitt) 



King George sound, Hudson strait, Ungava, Diana Expedition, Sept. 9, 

 1897, 40 fathoms. One colony on a barnacle. 



Cheilopora sincera (Smitt) 



Off Cockburn point. Dolphin and Union strait, C.A.E. Station 43a, 100 

 meters. Three small colonies without ooecia. 



Cheilopora praelucida (Hincks) 



Off Cockburn point, Dolphin and Union strait. Station 43a, 100 meters, 

 Sept. 13, 1915. One colony on a shell, very young, without ooecia. 



King George sound, Hudson strait, Ungava, Diana Expedition, Sept. 9, 

 1897, 40 fathoms. One colony without ooecia. 



The writer is of the opinion that praelucida will prove to be not more than 

 a variety of C. sincera. There seems to be much variability in the length and 

 breadth of the mucro. Hincks (1884, p, 27) states in his original description 

 that praelucida has no avicularia, and again (1888, p, 225) that the processes 

 at each side of the peristome are not really avicularia. Osburn (1912, p. 283) 

 has shown that some of these processes may bear avicularia, while in others 

 the avicularia are suppressed. The facts are these: some individuals and 

 some entire colonies are devoid of avicularia, others have degenerate aviculara 

 and still others fully developed avicularia similar to those of sincera. The 

 peristome rises higher and the mucro is larger in typical praelucida, but these 

 characters show considerable variation and apparently intergrade. Other 

 zooecial characters seem to agree. As all my specimens from the present col- 

 lection are young, I hesitate to positively merge the species. 



