INTRODUCTION. 
Echin. 3 
B. 
Geological : — 
i General ..... 
Page 
42 
ii Cainozoic : — 
a. General .... 
42 
b. Pleistocene .... 
42 
c. Pleiocene . . . 
42 
d. Meiocene .... 
42 
e. Oligocene .... 
(Vacant) 
f. Eocene .... 
43 
iii Mesozoic : — 
a. General .... 
(Vacant) 
b. Cretaceous (1. Upper. 2. Lower) 
43 
c. Jurassic ( 1 . Upper. 2. Middle. 
3. Lower) 45 
d. Lias (including Rhaetic) . 
45 
e. Trias 
. 
46 
iv Palaeozoic 
a. General .... 
46 
b. Permian .... 
46 
c. Permo-Carboniferous . 
46 
d. Upper Carboniferous . 
46 
o. Lower Carboniferous . 
46 
f. Devonian .... 
46 
g. Silurian .... 
46 
h. Ordovician . 
47 
k. Cambrian . 
(Vacant) 
1. Pre-Cambrian 
(Vacant) 
-Systematic. 
a. Echinoderma, general .... 
47 
B. 
Holothurioidea ..... 
47 
c. 
Echinoidea 
50 
D. 
Asteroidea 
74 
E. 
Ophiuroidea 
80 
F. 
Crinoidea 
87 
G. 
Cystidea and Edrioasteroidea 
93 
H. 
Blastoidea 
95 
K. 
Incertae Sedis 
96 
INTRODUCTION. 
I. Titles. The total 303 is thus made up : 1891, 1 ; 1892, 3 ; 1896, 2 ; 
1898, 2; 1899, 2; 1900, 3; 1901,10; 1902, 12; 1903, 27; 1904, 239; 
1905, 2. The sudden decline in both the total and the number for the 
year is partly due to a change in the method of obtaining the titles, 
partly to the fact that longer working hours at the British Museum (Nat. 
Hist.) render it more difficult for members of the staff to utilize the library 
of that establishment. In these circumstances the task of copying titles, 
indexing names, and sorting slips has been mainly performed by Miss 
Grant, to whose intelligent care I am deeply indebted. Making further 
allowance for the usual deficiency, the following numbers of writings 
dealing with Echinoderms in the years 1891-1904 inclusive, prove a genuine 
increase in the annual output : 189, 171, 166, 155, 172, 219, 198, 230, 264, 
318, 314, 289, 317, 240. That this has not been accompanied by increase 
in the length of the Record is clear from comparison of my predecessor’s 
