336 
Holmes. — New Marine Algae. 
I op sis. We are now able to confirm this opinion, having 
examined the cystocarps. It may now therefore be described 
as follows. 
CORALLOPSIS ACULEATA, nobis. 
Syn. Gelidium aculeatum , in Ann. and Mag. Nat. Hist. (1842), 
no. 91 ; Krauss, Regensburg Flora (1846), p. 210 ; J. Ag., Sp. 
Alg. p. 629. 
Sphaerococcus Heringii , Kiitz., Sp. Alg., p. 775. 
Gigartina aculeata , Kiitz., Tab. Phyc. vol. xvii. tab. vi. 
Descr. : — Fronde usque pedali, cartilagineo-cornea , 1-2 lin. 
crass a, inf erne c aide sc ente teretiuscula, mox dichotomo-corymbosa , 
ramis basi eximie constrictis , 4-5 angularibus , acideatis , aculeis 
oppositis , -zW ternatim , quaternatim verticillatis , lineam longis 
basi dilatatis , horizontalibus , interstitiis verticillorum bilinea- 
ribus ; colore coccineo-purpureo ; coccidiis ad ramos superior es 
numerosis ; sphaerosporis cruciatim divisis in ramis ultimis 
crassiusculis immersis. 
The singular resemblance that this plant bears to Eucheuma 
spinosum apparently led Kiitzing to refer it to the genus 
Gigartina , under which A. spinosum had up to that time been 
placed. Agardh also, whilst provisionally retaining Hering’s 
original name of Gelidium aculeatum, placed it (in 1852), as an 
undetermined plant, under the genus Eucheuma , remarking, 
however, that although the habit was that of Eucheuma , the 
structure was quite different and resembled that of Gracilaria , 
except in the cells of the cortical stratum forming very short 
filaments, a point in which the more recent genus Corallopsis 
differs from Gracilaria. The other prominent feature in which 
Corallopsis differs from this genus is in the more or less 
subarticulate appearance of the fronds, which is not well 
brought out in Ktitzing’s illustration of Gigartina aculeata . 
In this species it is chiefly confined to the base of the branches, 
which are much narrowed, particularly in the tetraspore- 
bearing plant. It is more nearly allied to Corallopsis Urvillei , 
J. Ag. than to the other species of the genus, from which it 
differs in the verticillate spines and less branched frond. 
