152 CERAMIACEAE 
originating as an introrse latero-terminal outgrowth from the 
basal (less often the second) cell of a 2-5-celled pinnule, the distal 
sterile cells at length deciduous. {PLATE 30, FIGURES 8-17.) 
Dredged “іп 214 fathoms,” Island of San Lorenzo, region of 
Callao, in company with Chaetomorpha, Cladophora, etc., and more 
or less overgrowing them, Coker 50 p.p., Feb. 5, 1907. 
The original specimen of Callithamnion densum Suhr, which 
was attributed to Peru, we have been unable to locate and ex- 
amine. Kützing included the species in his “Species Algarum " 
(650. 1849), but had notseenit. J. Agardh (Sp. Alg. 2:66. 1851). 
mentioned it under “Species inquirendae." De-Toni apparently | 
does not allude to it in his “Sylloge Algarum.” | 
The plants from Callao that were referred to Callithamnion 
Лоссозит by Montagne we have seen and consider them identical 
with Coker’s somewhat smaller specimens from the same locality- 
We regard them as distinct from Antithamnion floccosum and 
Suhr’s description fits them so well that we feel little hesitation in 
adopting his specific name for them. It may be remarked, how- | 
ever, that, in Suhr's sentence, “Die aus jedem Absatz hervor- 
kommenden, opposite stehenden Seitenzweige sind mit einseitigen 
Nebenzweigen besetzt, welche aber an den Endspitzen sich se. 
nahe kommen, dass sie fast nicht mehr von einander zu unter- 
