PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 445 



Most of the leaflets are simple, uot lobate, oblong or ovate lanceolate, 

 entire or merely crenulate on the borders by the impressions of the 

 veins. These leaflets are rarely preserved entire ; the borders are often 

 lacerated ; they vary from 3J to G«'" long and 1 to 2^'='" broad. They 

 e\idently represent leaflets of an Osmiinda. 

 Hah. — Coal Harbor, Unga Island. 



COXIFERiE. 



Thuites {Ghamcecyparis) Alaslcensis, sp. nov. 



Branchlets alternate, flattened, oblique ; leaves imbricate on four 

 ranks, the facial squamiform compressed, broadly rhomboidal quadrate, 

 slightly narrowed to the base, inflated on the borders and in the middle 

 toward the apex ; the lateral flattened by compression, exposing half 

 their face, and thus triangular, exactly filling the space between the 

 base and the top of the facial leaves, all thick. 



I find no distinct relation for this plant except with Thuites Meriani 

 Heer. Fl. Arct., Ill, p. 73, pi, XVI, figs. 17, 18, a cretaceous species dif- 

 fering by the facial leaves ovate, narrower towards the apex. 



Hah. — Same as the preceding. 



3IYRIGACEJE. 



Comptonia cuspidata, sp. nov. 



Leaves long, linear or very gradually tapering upwards to a terminal 

 narrowly elliptical lobe, pointed or apiculate by the excurrent medial 

 nerve, pinnately lobed; lobes coriaceous, convex, subalternate, free at 

 base, irregularly trapezoidal or obliquely oblong, inclined upwards and 

 sharply acute or cuspidate f primary nerves two, or three in the largest 

 lobes, oblique, the upper curving in ascending to the acumen and branch- 

 ing outside, the lower parallel and curving along the borders, anasto- 

 mosing with branches of the superior ones, generally separated by simi^le 

 secondary short nerves. 



Comparable to Comptonia acutiloha Brgt. and other European Tertiary 

 species of this group, but distinct from all by the large cuspidate lobes 

 turned upwards, &c. 



Hal). — Same as the preceding. 



Comptonia prcemissa, sp. nov. 



Leaves long, linear in their whole length, 5 to lO'^"^ long, 12 to ]5™"i 

 broad; deeply equally pinnate-lobate; lobes very obtuse or half round 

 cut to the middle and slightly decurring in their point of connection, the 

 terminal very obtuse; nervation obsolete, substance somewhat thick but 

 not coriaceous. 



The species has its greatest afiQnity to the living Comptonia aspleni- 

 folia Ait. It also appears related to C. rotundata Wat., as described by 

 Schimper, Pal. veget., II, p. 555, a species known to me only by its 

 description. 



Hal). — Chignik Bay, Aliaska. 



