SOME NEW AMi RABE DIATOMS. 



and the altering appearance of the radiant lines of cellules. The illustration gives an excellent 

 idea of the general appearance of this form. 



kulacodisciis iiiaiiiinotii*. Qrev., in Transactions Mie. Society, 1>»'>M. p 70, Plate 4. 

 We give a sketch of this unique species, in our Plate 2. Fig. 11. and herewith append 



Dr. Greville's notes thereon: 



•• Disc very prominently bullate beneath the processes, the bullations close to the margin and 

 forming elevated cones: processes long, cylindrical; furrows open, composed of two parallel i 

 of granules reaching the umbilical blank space. Diameter .0038 inch: elevation of bullation and 

 process above surface' of disc, 0012 inch." 



kulacodiscui decor u*. G 



14 Large, colored ; disc with numerous submarginal processes; furrows open, well defined by 



parallel lines of granules, terminating in very small blank spaces surrounding the | sses 



granules minute, irregularly disposed in the centre, soon passing into closely moniliform sleuder 

 lines with intermediate shorter ones." Plate 2. Fig. 1". Habitat. Barbadoes. Width of valve. 

 .0078 mch. 



Aiilitcii* caelatus, Bailey, var. gigas, E\\r. An enormous variety of the aboi 

 from Island of Iquique, South America; valve slightly oval : diameters .005 inch x .0057 inch. 

 Well shown in Plate 2. Fig. 12. 



lllliMll* stellatUS, X. Sp., H. L. .Smith. Valve small, rhomboid-oval: .<»<>22x 

 inch: umbilicus small, smooth, circular ; rays radiant from center in four directions, oculi la _ 

 compressed from centre; surface of valve studded with pearly granules. -Habitat, Island of 

 [quique, S. A. II. L. Smith. Plate 2, Fig. 4. 



These two species occur in the same gathering from [quique, (not Guano.) 



Synedra ulna, var. Chaseana, B. W. Thomas. Valve slender, .0214 to .0296 in 

 length : striae 17 in .001 inch, extending across the valve: no blank space in centre: extremities 

 constricted and rounded. Plate 2. Fig. 3. Habitat, Lake Michigan : Mi-. B. W. Thomas. 



This Svnedra is notable for it> very great length, some specimens in our posse>sion being one- 

 thirty-second of an inch long, and none less than one-fiftieth : the striae are 28 in .001 inch : a 

 good idea of its appearance is given in the figure. 



Synedra affini*. var. Baileyaua. 11. BL Chase. Valves small, from .001 14 to. 0034 inch 



in length; ,-triation that <<\' S. affinis, 33 in .001 inch: valve- variously bent and constricted. 

 Habitat, Brazilian Coast. Plate 2. Fig. 1. a — '/. 



•rv remarkable appearing species, quite common in a marine gathering from Maranheim. 

 South America: the normal form i> given in Fig. 1: a few of the many variations shown 

 in a 





