Tin: MAKIXi: ALCLE OF NKW KXflLAND. 153 



ilestitutoofa iiiidrilt ami with a ciliatotl mar«j:iu. It l)«>ars a close rosomUlanco to Ctil- 

 liblepharh ciliata, Kiitz., which is a comniou Kuropoaii species, aud it was introduced 

 under that name in the Nereis, in which work lihodophyUis vcprcvula was cited on the 

 authority of Aj^ardh. But snhse<inent observation and examination of the cystocarjiic 

 fruit has shown that the (\ viliata of the Nereis is the same as IlhixIophiflliM vtprccula, 

 Ai;. (Johi states that /»'. irptrvula of A«;ardh is the Fucus dichotomua of Lepcchin, auil 

 he considers that C cUlatu, Kiitz., should also be included witli it under the name of 

 JUiodophifllix ilirhotoma (Lepechin). We have retained the nameof A^ardh b«'cause we 

 on\y wish to assert that <Mir j)lant is a lkln)dophi/lHM alrea<ly describe*! by A<;ar<lh, but 

 do not wish to <;o so far as to express an opinion with re;;ard to the identity of the 

 two European plants, siuce we have never been able to examine the fruit of ('. 

 viliata iu "jood condition. Our form, as found on the Massachusetts eoast, is well de- 

 veloped and aj::ree8 perfectly with specimens collected by Dr. Kjellman in Greenland, 

 The narrow variety was found by Harvey at Halifax. In Herb. Gray is a narrow 

 specimen from Labrador, marked CaUihhphavis Jubata, apparently in Louormaud's 

 handwriting;. 



EUTUOllA, Ag. 



(Derivation uncertain. ) 



Fronds meiubrauaceous, subdicliotoinously piimate, formed iutLTiially 

 of large obloug cells, between which is a network of slender branching 

 lilaments with a cortical layer of small cells ; tetraspores cruciate, ini- 

 mer.sed in the cortex of the thickened apices ; cystocarps external, sub- 

 spherical, marginal, containing a central nucleus attached to the walls 

 of the conceptacle composed of tufts of radiating sporiferous lilaments 

 I round an ill-detined cellular placenta. 



A small <;enus of only two species, one of which is found in the North Atlantic and 

 the other in the North Pacilic. The structure of the fron<l in our species is peculiar 

 and is the same as that of the genus Callojfhifllis. Between the rather large cells of 

 the interior run small branching filaments, best seen in longitudinal sections. The 

 -enus is separated from Jihodi/menia^ in which it was formerly included, iu cousequence 

 of the peculiar frond and cystocarp. The structure of the latter is not at all well 

 known and should be studied on our coast, where there is au abundance of material. 

 The conceptacles are small and are borne on the margin of the frond, and the carpos- 

 tome is not at all prominent. The arrangement of the spores is complicated and not 

 easily described. They are arranged in tufts of short lilaments, radiating from a com- 

 mon point, and the ditlereut tufts, which are very inimerous, apparently surround a 

 central cellular placenta, not at all sharply delincd. At any rate, there is nn large 

 caqwigenic cell, either at the center, as in UhodnphijUis, or at the bivse, a« in Ithodymcnia, 

 and it is by no means certain that the genus should be i>laced iu the present suborder. 



E. citiSTATA, J. Ag. (Spliccrococcuft cristatus, C. Ag. — Ixhodymcnia 

 crintata, Grev. ; Phyc. Brit., PI. .307. — ('aUophijUls crisfafa^ Kiitz.) 



Fronds ro.sy-red, one to live inches high, membranaceous, tlabellately 

 expanded, main <livisions wi<lely spreading, alternate, repeatedly sub- 

 divided, ui)per divisions alternate, linear, laciniate at the tips, with a 

 fimbriated margin: tetras])ores cruciate, in the thickened tips of the 

 fmnd ; cystocaips small, marginal, nearly spherical. 



On algaj, especially on Laminarin', in deejj water. 



