302 
IOWA ACADEMY OP SCIENCE Vol. XXIV, 1917 
residents at the Laboratory renders the amount constantly more 
varied. Running water, together with collecting apparatus and 
a fair complement of laboratory equipment are other advantages 
which the laboratory offers. The attending people have free use 
of the aquarium located on Agar’s Island. 
A private laboratory, if desired, may be erected and main- 
tained at little expense, which permits more freedom for the col- 
lector. Save the slight amount of literature and the running 
water such a laboratory presents as many advantages to two or 
three men as does the Laboratory on Agar’s Island. Three men 
from Grinnell maintained such a laboratory, and the expenses 
for the stay there were less than for the same time spent at 
the Harvard Station, while the individual freedom was consid- 
erably greater. 
During a term of more or less superficial collecting, on account 
of a limited knowledge of invertebrate forms, the following types 
were secured : 
Porifera 
Calcarea 
Non-Calcarea 
Myxospongiae 
Silicispongiae 
Hexactinellida 
Desmospongiae 
Coelenterata 
Hydrozoa 
Leptolinae 
Anthomedusa 
Leptomedusa 
Hydrocorallina 
Scyphozoa. 
Discomedusae 
Semostomae 
Actinozoa 
Zoantharia 
Actiniaria 
Madreporaria 
Alcyonaria 
Gorgonacea 
Platylielmintlies 
Turbellaria 
Polycladida 
Molluscoida 
Echinodermata 
Asteroidea 
Cryptozonia 
Orpliiuroidea 
Ophiurida 
Echinoidea 
Regularla 
Clypeastridea 
Holothuriodea 
Pedata 
Apoda 
Annulata 
Chaetopoda 
Polychaeta 
Errantia 
Sedentaria 
Cephyrea 
Inermia 
Arthropoda 
Crustacea 
Entomostraca 
Malacostraca 
Decapoda 
Macrura 
Brachyura 
