258 MY1UOZOID.E. 



in one case the rounded and the spatulate, in the other 

 the rounded and the pointed forms, are associated. 



The Lepralla plana, Dawson, from the Gulf of St. 

 Lawrence and the Canadian Postpliocene deposits, is an 

 allied but distinct species. 



HABITAT. On stones and shells, from shallow to deep 

 water. 



LOCALITIES. Var. divergens: Guernsey (A. M. N.) : 

 Hastings, on scallop-shells (Miss Jelly) . 



GEOGRAPHICAL DISTRIBUTION. Var. divergens : off the 

 coast of Florida, 135 fathoms (Pourtales) : Algiers 

 (J. Y. J.). Var. biaperta : Spitzbergen and Greenland, 

 not frequent (Smitt) : Kara Sea (Stuxberg and Theel) : 

 Floridan Sea, very common (Pourtales). 



RANGE IN TIME. English Crag (Busk) : Older Pliocene, 

 Castrocaro (Manzoni) : Miocene, Doue, France (fide 

 Waters). Forma eschariformis, Sicilian Pliocene, Bruc- 

 coli (A. W. Waters). 



SCHIZOPORELLA ARMATA, Hincks. 

 Plate XLI. figs. 7, 8. 



LEPRALIA ARMATA, Hincks, Devon and Cornw. Cat., Ann. N. H. eer. 3, ix. 

 207 (47 sep.), pi. xii. fig. 5. 



Zocecia rather broad, ovate, distinct, quincuncial ; surface 

 granular, sometimes punctured round the margin; 

 orifice orbicular, with a deep, loop-like sinus below; 

 peristome raised and thickened in front and at the 

 sides; oral spines four or five, very tall and stout, two 

 or three placed on the upper margin, and two lateral, 

 the latter projecting in front of the ovicell; on each 

 side of the orifice, near the top, a raised process bear- 

 ing a small avicvlarium, with a semicircular mandible 



