TIIK MAKIXi: ALG.E ul NLW KNc.LA.M). 59 



.35-00""", sporitVroiis mass .Ol-S""" bioad l»y .l(>-ir»""" lun«i-. Spores 

 .015""" by OJO""". 



On wharves and rock.s between tide marks, mixed with CaI<>(Jiri,v sco^)- 

 ulonim and riothriw. 



l^astport, Me.: (Uoncester, ^lass. ; Knrope. 



I'lolmltly ioimnon in th«' aunuim aloii^ our northern coast, ami at t>nce recognized 

 l»y the loui; icnninal stalk, whicli appears to hv an appendaijje of the cell-wall. Tho 

 size is so variable that no accurat«' nieasurenunts as to length can be givm. Those 

 above statetl represent the si/e ot iully-grown sp«>ritVrons individuals. 



Suborder 13RY0PSIDILE. 



Fronds <;rei'n. nnieelhir, lilamcntons, branching ; rcpnxbietion by 



zoospores, with two eiha, formed in the oeehided brauehes. 



A small suborder, including with us a single species of Uri/opsia and a single species 

 of Thrhisiu, a genus whose position is uncertain and which may jirove to be more 

 nearly related to raitchtria x\\i\n to liri^opsix, although in the present article wc have 

 placed it with the latter. 



BRYOPSIS, Lam. 



(From Jpvov, a moss, and oi-t-, an appearance.) 



Fronds bri«;ht-green, nnieelhdar, branching, nsnally pinuately di- 

 vided ; rejirodnction by spores formed in oeehided portions of tho 

 branches: si)ores of two (?) kinds — either green zoosi)()res, l^nrnislied 

 with two apieal eiha, or orauge-eolored. 



rhe genus Bryopsis includes perhaps not far from twenty sp<'cies, which are charac- 

 terized by the mode of branching. Most of them are pinnately compound, and tho 

 different forms pass so gradually into one another that the species cannot be said to 

 be well marked. The fron<ls are unicellular except at the period of reproduction, 

 when some of the smaller luanches are separated by i)artitious from the rest of the 

 frond. The position of the genus is still doubtful, as the development is not known. 

 The reproductive bodies generally found are green zoosjiores wliich have two temil- 

 ual cilia. Whether they conjugate or not is not known, although as Thuret reports 

 the occurrence of zoospores with four cilia, such is probably the case. A second form 

 of reproiluctive bodies was found by Pringsheim in linjopHis, orange-colored motile bod- 

 ies furnished with two terminal cilia. 'J he development of these ])odies has not been 

 observed. Janczewski ami Hostatinski have ex|>resscd the opinion that they may bo 

 parasites, but C'ornu contirms the statement <»f rringsheim that they are really organs 

 of the Bri/opnis. 



B. PLUMOSA, (Hiuls.) Ag., Phyc. P.rit., PI. :\. PI. IV, Fig. 1. 



Fronds 2-(; inches long, often gregarions, i*-l times pinnate, piiinides 

 pyramidal in ontline, naked at the base, in the njtper jiart elotlird with 

 short junnnhe, which are constricted at base. 



On mnddy wharves and stones at low-water mark. 



A beautiful «peeies, not uncommon along our whole eastern coast, and also frequently 



