. Transactions and proceedings of the New Zealand Institute . nly not A. eruca ; and as A. mirahilis is figured with f bends,while my species varies from ^ to f, I assume it to be a new maskellii, sp. nov. Frustule : front view rectangular; length about four times the breadth,straight, forming a lengthened tenacious filament, showing lines of dots atthe points of sutme corresponding to the striae on the side view. Valve :elongated, shghtly arcuated, and attenuated towards the extremities, whichare boldly rounded ; both edges are sinuated; length about seven timesthe breadth
. Transactions and proceedings of the New Zealand Institute . nly not A. eruca ; and as A. mirahilis is figured with f bends,while my species varies from ^ to f, I assume it to be a new maskellii, sp. nov. Frustule : front view rectangular; length about four times the breadth,straight, forming a lengthened tenacious filament, showing lines of dots atthe points of sutme corresponding to the striae on the side view. Valve :elongated, shghtly arcuated, and attenuated towards the extremities, whichare boldly rounded ; both edges are sinuated; length about seven timesthe breadth. The convex edge has invariably one more bend than the con-cave. The valves vary in the number of the bends from f to f. Stri«:parallel and transverse, and there are 23 to 27 to the -001 of an inch. Hab.—Ngapari, Fernside, and Eiver Avon, North Canterbury ; Wai-kato and Cabbage Tree Swamp, Auckland (fossil)—Hutton; Cust ValleySwamp, North Canterbury (fossil). Plate XXII., fig. 2 : a, front view filamentous; c, side view. TRANS. , SZcUl. NEW IE/1 UNO DMTOMACE£. Armsteong.—Description of new Plants. 369 On a new Species of Pleurosigma. [Read before the Philosophical Institute of Canterbury, 13th October, 1881.] Pleurosigma crookii, sp. nov. Frustule: front view linear, narrowing towards the truncated extremi-ties ; length about eight times its breadth. Valve : side view, linear for thegreater part of its length and slightly sigmoidal towards the rounded ex-tremities, making the flexum only terminal; length, 0025 to 0040 light brown. Striae obscure. Median line central, approachingconcave side near extremity. Hah.—Fresh-water, New Brighton. The genus Pleurosigma has not been found hitherto in New Zealand. Ibelieve 1 saw it a few months ago in a very small gathering which I obtainedfrom Ngapari, Fernside, but as the frustules were so few in number Icould not examine them satisfactorily. The present species occurs in con-siderable number
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