14 
E. eg aa Ralfs. 
Hab.: Waters of the Gulf country, Dr. Thos, L. Bancroft. 
E. asperum, raged (n. spe ec.). A large Euastrum; median notch 
pes and widened ; semi-cells three- lobed, ~eurnished at the base with 
5 stout spines and in oe middle with 2 pits ; polar lobe scarcely dilated, 
deeply notched at the apex, furnished with « sharp tooth on each side ; 
lateral lobes with 2 lobules, lobules bidentate ; lateral appearance 
wedge-shaped—not seen from the vertex. Length of cell, 8243 
breadth, 45-46 »; breadth of isthmus, 10-11 p. (Plate XII.) 
Hab. : Rockingham end J. Dallachy. 
This species is clear] sely allied to E. rostratum, b bap veges Nordst., wit ; : 
which it ns peels in oenerahd appearan ce when viewed from the front; on acc a 
its peculiar armament and a ng aspect T have thought that I should classify 
it as a separate parle. — Bor: 
E. ansatum is . piscrobiculata, W. Schmidle, The 
following is Professor Schmidle’s description of this nee form * 
“Dimensions, 94: 44 ». Above the constriction @ re to be ound 
upon the semi-cell as many as three protuberances placed eae 
Above these there is a broader middle protuberance, which is fla 
to et and left by a scrobicula— Schmidle. (Plate II.) 
: Herston road, W. J. Byram. 
E. ansatum, var. attenuatum, M7. Schmidie. This 80 ne 
variety, of which Professor Schmidle gives the following descriptie 
The ve . clearly larger than in the typical form ; dime -col 
120: e under corncrs somewhat more rounded. The sem! 
much more considerably towards the narrow, truncated shader t 
all forms of the species known to me. Generally above the 18 
is to be found a middle protuberance, which is surroun ed fa IL) 
papille, to the left, one to the right, and onea above. ec ; 
Both si occur mixed in the material from here moog = wmediat? 
b.: 
aa by Mr. W. J. Byram, without it being possible to detec 
Length of cell, 58°5 yx; breadth, 3 
Length of semi-cell 27 »; breadth, 32:5 nai 8 . breadth of ehindl 65 pe 
Borge. (Plate 
Hab. : errant Bay, J. Dallachy. 
Form: oe i furnished pio pant on the bast sg 
no teeth observed ; seen from the bas cells furoith 63 Fi 
side with a large auoraiad inflation. “Tength of opis er) 
breadth, 36-38 »; breadth of — 6°5-8'°5 p.— Borge. 
Hiab, : Waten ft. Comper? 
5 Es phat aes aca eS ea A ara 5 Sa ca ea ee ee ee 
