THE MARINE ALG.E OF NEW ENGLAND. 153 



destitute of a midrib and with a ciliated margin. It bears a close resemblance to Cal- 

 liblepharis ciliata, Kiitz., which is a common European species, and it was introduced 

 under that name in the Nereis, in which work EhodopTiyllis vcprccula was cited on the 

 authority of Agardh. But subsequent observation and examination of the cystocarpic 

 fruit has shown that the ft ciliata of the Nereis is the same as Bhodophyllis veprecula, 

 Ag. Gobi states that B. veprecula of Agardh is the Facus dichotomus of Lepechin, and 

 he considers that ft ciliata, Kiitz., should also be included with it under the name of 

 Bhodophyllis dichotoma (Lepechin). We have retained the name of Agardh because we 

 only wish to assert that our plant is a Bhodophyllis already described by Agardh, but 

 do not wish to go so far as to express an opinion with regard to the identity of the 

 two European plants, since we have never been able to examine the fruit of ft 

 ciliata in good condition. Our form, as found on the Massachusetts coast, is well de- 

 veloped and agrees perfectly with specimens collected by Dr. Kjellmau in Greenland. 

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

 specimen from Labrador, marked Calliblcpharis jubata, apparently in Lenormand's 

 handwriting. 



EUTHOBA, Ag. 



(Derivation uncertain.) 

 Fronds membranaceous, subdichotoinously pinnate, formed internally 

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

 filaments with a cortical layer of small cells ; tetraspores cruciate, im- 

 mersed 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 filaments 

 around an ill-defined cellular placenta. 



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

 the other in the North Pacific. The structure of the frond in our species is peculiar 

 aud is the same as that of the genus Callophyllis. Between the rather large cells of 

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

 genus is separated from Bhodymenia, in which it was formerly included, in consequence 

 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 an 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 filaments, radiating from a com- 

 mon point, and the different tufts, which are very numerous, apparently surround a 

 central cellular placenta, not at all sharply denned. At any rate, there is no large 

 carpogenic cell, either at the center, as in Bhodophyllis, or at the base, as in Bhodymenia, 

 and it is by no means certain that the genus should be placed in the present suborder. 



E. cristata, J. Ag. {Sphccrococcus cristatus, C. Ag. — Bhodymenia 

 cristata, Grev. ; Phyc. Brit., PI. 307. — Callophyllis cristata, Kiitz.) 



Fronds rosy-red, one to five inches high, membranaceous, flabellately 

 expanded, main divisions widely spreading, alternate, repeatedly sub- 

 divided, upper divisions alternate, linear, laciniate at the tips, with a 

 fimbriated margin; tetraspores cruciate, in the thickened tips of the 

 frond ; cystocarps small, marginal, nearly spherical. 



On algre, especially on Laminarke, in deep water. 



