274 MYRIOZOIDJE. 



Not unfrequently the interstitial spaces between the 

 lines of cells are punctured, the perforations being narrow 

 and elongate. Small tubules are also sometimes present 

 in the same situation, which I believe to be the rudi- 

 mentary stage of the dwarf cells that bear the ooecia, and 

 of the other secondary cells associated with them. 



In a variety from Santa Cruz the cells are much pro- 

 duced and attenuated below, with massive transverse 

 ridges, one of which projects immediately beneath the 

 mouth ; the interstices are strongly punctured. (Plate 

 XLV. fig. 3.) 



HABITAT. On shells, stones, Laminaria saccharina and 

 other Algae, stems of Sertulariidse, &c., from between 

 tide-marks to deep water (between 62 and 72 fathoms, 

 coast of Antrim ; 100 fathoms, Greenland) . 



LOCALITIES. Universally distributed on the coasts of 

 Great Britain and Ireland. 



GEOGRAPHICAL DISTRIBUTION. Cosmopolitan. Australia 

 (vars. cornuta and tuberculata] ; New Zealand (T. H.) : 

 East Falkland Islands, 4-10 fathoms (Darwin) : Cape of 

 Good Hope (Harvey) : Kerguelen's Island, three vars. 

 (Busk) : Natal, var. cornuta (W. Gates) : California, 

 normal and var. cornuta (Dr. Sinclair) : Anticosti and 

 Mingan Islands (Packard) : Bahusia to Spitzbergen and 

 Greenland, 3-30 fathoms (Smitt) : Davis Strait, off Fre- 

 derickshaab, 100 fathoms (Wallich) : Nova Zembla, 2-20 

 fathoms (Stuxberg and Theel) : off Bear Island (Dutch 

 Arctic Exped.) : Roscoff, on red Algae and Chondrus 

 (Joliet) : France, S.W. (Fischer) : Santa Cruz, var. (Miss 

 Jelly). 



RANGE IN TIME. Cor. Crag, Sutton, on shell (S. W.) : 

 Red Crag (A. Bell) : Scotch Glacial deposits (Geikie) : 

 Postpliocene deposits, Canada (Dawson). 



