175 
The return to San Juan was made overland by stage and rail 
by way of Mayagiiez, Aguadillaand Camuy. A stop of two days 
was made at Mayagiiez and the Agricultural Experiment Station 
now located there was visited. The shores about Mayagiiez are 
almost wholly of sand and offer very little in the line of algae. 
The visit to the island resulted in the collection of about 900 
numbers of marine algae, many of which are represented by a 
good series of duplicates. Half of the numbers are represented 
both by dried specimens and ‘by material preserved in fluids. 
Many of the specimens will make valuable additions to the ex- 
Fic. 21. Fruit of the sea-grape (Coccolobis Cvifera), San Juan. 
hibit in the public museum. The collection is of special interest 
from the systematic and geographical standpoint, as the marine 
" flora of Porto Rico is quite imperfectly known. The only paper 
that has ever been published treating exclusively of the marine 
algae of Porto Rico is, I believe, one by Dr. F. Hauck. This 
was printed in 1888 and enumerates 92 species collected by Paul 
Sintenis, the well-known German botanical traveler, who was in 
Porto Rico from September, 1884, to June, 1887. Botanists who 
had visited Porto Rico previously seem to have given almost no 
