280 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.43. 



HIPPOTHOA HYALINA (Linnaeus). 



Cellepora hyalina Fabricius, 1780, p. 435. — Rink, 1877, p. 444 



Mollia hyalina Verrill and Smith, 1873, p. 713. 



Celleporella hyalina Bidenkap, 1905, p. 18. 



Schizoporella hyalina Whiteaves, 1901, p. 100. — Cornish, 1907, p. 77. 



Localities. — Fourteen miles south of Cape Sable, few; St. Pierre 

 Banks, Newfoundland, several small colonies on Pecten shell; near 

 Egg Harbor, Labrador, several small colonies on the back of Flustra 

 carbasea. 



This species has been much shifted about in various genera, espe- 

 cially in Celleporella, Schizoporella, and tlie above. Wliile the char- 

 acter of the orifice might place it in any of these genera, I am con- 

 vinced that its relations are particularly with Hippothoa with which 

 it agrees in the texture of»the ectocyst and in the dwarfed condition 

 of the fertile zocecia. The appearance of the colony is, to be sure, 

 quite different from that of the common Hippothoa divaricata Lamou- 

 roux, but in this respect Hippothoa expansa Dawson is interme- 

 diate. 



SCHIZOPORELLA AURICULATA (Hassalljf. 



Lepralia globi/era Packard, 1867, p. 408. 



Escharella auriculata Verrill, 1875a, p. 414. — Rink, 1877, p. 444. 

 Smittia globi/era Verrill, 18796, p. 30; 1880, p. 192.— Whiteaves, 1901, pp. 100 

 and 106, records the species under this name and also imder auriculata. 



Localities. — Fourteen miles south of Cape Sable, several colonies; 

 St. Pierre Bank, Newfoundland, one colony. 



SCmZOPORELLA PLANA (Dawson). 



Lepralia plana Dawson, 1859, p. 256. 



Myriozoum crustaceum Rink, 1877, p. 444. 



Leieschara plana Verrill, 18796, p. 30. 



Myriozoum planum Hincks, 1892, p. 157. — Whiteaves, 1901, p. 99. 



Schizoporella Crustacea Bidenkap, 1905, p. 17. 



Locality. — Shoal Tickle, Labrador, one colony encrusting stem of 

 Myriozoum coarctatum. 



After studying this species carefully mth ample material I can see 

 no valid reason for placing it in the genus Myriozoum as has been 

 done by nearly all writers. The form of the zocecial orifice, to be 

 sure, is similar to that of M. coarctatum, but this structure varies as 

 greatly in Myriozoum as it does in Schizoporella, and the zooecial 

 aperture in such species as S. cecelii and S. spongites has essentially 

 the same character as that of S. plana. The formation of the colony, 

 the character of the zooecial wall and of the ovicell all seem to relate 

 the species closely to Schizoporella. The species has generally been 

 known under the name of Myriozoum crustaceum Smitt and later 

 European authors have adhered to this is spite of the fact that 

 Hincks (1892, p. 157) has shown that Dawson was the first to describe 

 the species under the name Lepralia plana. 



