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New American Coralline Algae 
By M. FosLIE anp M. A. HowE 
The material on which the following descriptions are based has 
been secured by the junior author of the present paper on expedi- 
tions sent out by the New York Botanical Garden to Bermuda, 
Florida, the Bahama Islands, and Porto Rico. The coralline algae, 
especially the crustaceous kinds, have been, for more or less obvious 
reasons, largely neglected by collectors, and the species of the West 
Indian region in particular are still very imperfectly known. In- 
deed, it may be said that any attempt to arrange and classify the 
unarticulated corallines in general can be considered as only tenta- 
tive until the three forms of reproductive organs, which all species 
are supposed to possess, are known for each species. In some of 
the species and subspecies described below as new, the material is 
entirely sterile; in others, empty conceptacles alone have been 
found; yet the plants, as a rule, possess such well-marked distinc- 
tive characters in outward form or internal structure that we be- 
lieve our descriptions and photographs will prove sufficient for their 
or ae 
The gross specimens and microtome-sections from which the 
Sie photographs have been taken are deposited in the museum 
of the New York Botanical Garden, though carefully selected dupli- 
cates, both of the gross specimens and of the microscopic prepara- 
tions used, are in the possession of the senior author at Trondhjem ; 
in two cases (Lethophyllum bermudense and Lithothamnton frutic- 
ulosum aemulans), the single original specimen was broken into 
two nearly equal parts after photographing, and a half is in the 
possession of each of the authors. The photomicrographs were 
taken by Dr. Edward Leaming of the College of Physicians and 
Surgeons, New York. Following, are descriptions of the species 
and forms which we believe to be hitherto unrecognize 
Archaeolithothamnion dimotum sp. nov. 
Thallus forming crusts 0.5-1.0 mm. thick, closely adherent to the 
substratum, destitute of proper excrescences, thou ugh often rough 
cinta: and partly vertically elongated, attaining a length of 15 p, 
ow and then with longest diameter hancontal, minute intermediate 
