OEGANISMS IN ACADIA. 14S 



the sides projecting iioints which appear to mark the points of attachment of similar 

 enlargements of the frond. The stichida has transverse rows of dark spots, some of 

 which grow out into projecting sporangia, ovoid, and pointed at the upper end. There 

 are about a dozen of these spots in each row on the stichida. 



Size. — Width of branches (or frond), 1| to 2 mm. ; length, 40 mm. or more. Length 

 of stichida about 12 mm. 



Horizon and Loculily — In the green and purple shales of Div. 1 6 in the Basal series at 

 Hanford Brook. Also in olive grey bands in the red sandy shales of Div. 2, in the same 

 series at Caton's Island. 



This plant may be related to Fucoides circinnatus, Brongu., (PI. V, fig. 4) which he 

 characterized as follows : — 



" F. fronde ramosa, subpedali, ramulis elongatis, subsimplicibus, cylindricis, arcuatis 

 et eodem latere subcircinnatim deflexis." 



Seaweed having a branched, somewhat stalked frond ; branches elongated, rather 

 simple, cylindrical, arched, and bent to one side in a subcircinate manner. 



Torrell's note of the locality is " Afvenledes funnen i Vestergothlands fucoid- 

 sandsten." 



If it were not that Bronguiart says that the branches of this plant are round, I should 

 be disposed to think it of the same genus as the species above described, as it is always 

 found bent to one side ; and occurring in such a way in the shale as to give the 

 impression that it formed a compound frond, such as that figured by Brongniart. But our 

 plant is always flat and does not seem to have received this form by pressure in the shale. 

 I therefore feel it necessary to provide for this species a separate name, more especially as 

 the fruitage appears to be peculiar. 



PAL^OCHOEDA, McCoy, 1849. 

 Pal^ochorda setacea, u. sp. (PL VI, figs. 1 a-g.) 



To this genus of McCoy is referred a marine plant from the lowest sandstone beds 

 (16) of the Basal series. 



The stem or frond is long, cylindrical, flexuous, and was composed of open cellular 

 tissue, more closely compacted at the walls of the stem, where there are elongated cells, 

 closely set. The stem has a rough cuticle, marked by faint, transverse, closely set grooves 

 (about 2 or 3 mm. apart, or in some If mm. apart.) Attached at the nodes formed by 

 these furrows are long jointed setœ, 2 cm. or more in length, about J mm. in diameter, 

 and having diaphagms aboi\t 1 mm. apart. 



Size. — Length, unknown ; thickness, from *7 to 10 mm. 



Horizon and Locality. — In greyish layers among the purplish sandstones of Div. 1, 

 Baud b, in the Basal series at Hanford Brook, St. Martin's. Occurring in tangled masses 

 spread over the surface of the beds. 



This plant has the general aspect of a Palseochorda. The large setaB are perhaps 

 antheridea. It evidently was a marine plant, for the purple sandstones in which it is 

 found abound in the debris of sponges. The best examples are found in clayey layers 

 where some of the stems have been flattened and others preserve their oval form having 



Sec. IV, 1889. 19. 



