60 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxia. 



Size in mUiimeters. — Introvert extended, length; specimen </, 50; 

 greatest diameter, 25; introvert retracted, length, specimen ?>, 90; 

 greatest diameter, 70. 



SpiSiles of hody wall. — Irregular perforated plates as described 

 and figured hj Clark, 1904. 



Calcareous ring. — Well developed when compared with japonica. 



Polian Vesicle. — In J, one, rather long. In a., three; one in the 

 right ventral interradius, one in the left ventral interradius, and one 

 in the left ventral radius. 



Stone canal. — One, short, in dorsal mesentery, with a single head of 

 ver}'^ closely crowded madreporites projecting from the dorsal mesen- 

 tery toward the oral ring. 



Ludwig, 1900, and Clark, 1901«, 1904, question the occurrence of 

 this species on the Pacific coast of North America, but these two 

 specimens, with the chief characters as briefly related above, are, 

 beyond question, of the type frondosa as described, for instance, by 

 Clark, 1904, page 566. 



Ilahitat. — (?) Florida Reef (Pourtales, 1S69). Massachusetts to Lab- 

 rador (Gould, 1841, Aj^ers, 1851, Stimpson, 1853, Verrill, 1866, Packard, 

 1867, Ludwig, 1882, Ganong, 1884, 1888, Lampert, 1885, Ludwig, 

 1900, Kingsley, 1901, Whiteaves, 1901, Clark, 1904). Baffins Bay 

 (Duncan and Sladen, 1877, 1881). Assistance Bay, Barrow Strait, lat. 

 75^" N. (Forbes, 1852). West coast of Greenland to lat. 69° N. (Fabri- 

 cius, 1780, O. F. Midler, 1788, Liitken, 1857, Stimpson, 1863, Norman, 

 1876, Ludwig, 1882, 1883). Iceland (O. F. Midler, 1788, Liitken, 1857, 

 Ludwig, 1883). Jan Mayen (Fischer, 1886). Faroe Islands (Liitken, 

 1857, Bell, 1892, Sluiter, 1895, Horring, 1902, Schmidt, 1904). South 

 from Scandinavia to Kattegat (Diiben and Koren, 1846). Coast of 

 Norway, south to Hardanger fjord, lat. 59'^ N. North to North Cape 

 and Finmark (Gunnerus, 1770, O. F. Miiller, 1806, Diiben and Koren, 

 1846, M. Sars, 1850, 1861, Liitken, 1857, M' Andrew and Barrett, 

 1857, Lampert, 1885, Kiikenthal and Weissenborn, 1886, Grieg, 1889, 

 and 1896, Nordgaard, 1893, Sluiter, 1895, Ostergren, 1902). Baren 

 Island (Danielssen and Koren, 1882). Shetland Islands (Forbes, 1841, 

 Dalyell, 1851, Ludwig, 1882). Orkney Islands (Bell, 1892). Coast'of 

 Scotland (Forbes, 1841, Dalyell, 1851, M'Intosh, 1875, Bell, 1892). 

 Ireland (Thompson, 1840, 18*44, Theel, 1886. Southwest England to 

 lat. 50° N. (Bell, 1892). Spitzbergen, to lat. 80° N. (v. Heuglin, 1874, 

 Ljungman, 1879, Ludwig, 1900). Barent's Sea (Sluiter, 1895). Mur- 

 man coast (Jarzynsky, 1885, Pfeffer, 1890). Kara Sea (Levinsen, 1886). 

 Point Franklin, Alaska (Murdoch, 1885). San Francisco (A3^ers, 1855). 

 Admiralty Inlet, Port Townsend, Washington, Afognak Island, 

 Kadiak Island {Albatross., Alaska Salmon Investigations, 1903). 

 Ludwig, 1900 (p. 143), gives this species as two-thirds circurapolar. 



Depth to 218 fathoms; usually lives in from 2 to 30 fathoms. 



