486 THE AMERICAN NATURALIST.  [Vor. XXXV. 
fusiformis (Cucumaria) Desor = Thyone unisemita of the key 
fusus (Thyone) Verrill = Thyone scabra RT 
girardii (Synapta) Pourtales = Synapta inhaerens 6 4 € 
glabrum (Thyonidium) Ayres = Thyone briareus uen 
gracilis (Synapta) Selenka = Synapta inhaerens d xr 
grandis (Botryodactyla) Ayres = Cucumaria frondosa. “ “ “ 
granulatus (Psolus) Ayres = Psolus regalis A d 
sitchense (Liosoma) Brandt = Chiridota discolor Ww. 0 
sitchensis (Cuvieria) Brandt = Psolus fabricii E 0€ 
tenella (Thyone) Selenka = Thyone briareus E ae 
tenuis (Synapta) Ayres = Synapta inherens ww 
tigillum (Chiridota) Selenka = Chiridota levis w Ww 
turgidum (Molpadia) Verrill = Trochostoma boreale “« “ * 
typicum (Chiridota) Selenka = Chiridota levis eue ee 
viridis (Synapta) Pourtales = Synapta vivipara «c un 
The following species are so very poorly described and so 
little known it is impossible even to assign them as synonyms: 
Holothuria tentaculata Forster, Synapta bachei Ayres. 
The artificial key given on pp. 487, 488 is intended to include 
and make possible the identification of every known species of 
holothurian which occurs on the coasts of America, north of 
Mexico, in less than 100 fathoms of water. There are a few 
species which probably occur within these limits (as they have 
been taken just outside), but they are not included in this key. 
The holothurians of Florida and the Gulf coast and those of 
the Pacific coast are almost unknown, and the geographical 
range of even our most common species is very imperfectly 
known. It has therefore been thought best to give as exactly 
as possible the localities where the various species have been 
taken. There are five species included in the key which are 
new to science and the descriptions of which have not yet been 
published; but descriptions and figures are now in press of 
two of these forms, which were collected in Puget Sound in 
1896 and 1897 by the zoólogists of Columbia University. 
These are Psolus chitonoides Clark and Cucumaria lubrica 
Clark. The third species is Cucumaria curata Cowles, also 
from the Pacific coast. Mr. H. P. Cowles is now engaged in a 
study of the life history of this species, and in advance of his 
own publication he has very kindly given me the name he has 
