2 Records of the Indian Museum. [VoL. XT, 
Carter, Thoosa, Hancock, Dotona, Carter and Cliothosa, Topsent ; 
but the last seems to me of doubtful validity. 
Of these six genera all but Clionopsis are known to occur in 
Oriental waters. Clionopsis! is at present recorded only from the 
Pacific Coast of S. America and from an unknown locality prob- 
ably in the Tropics. Alectona*® and Dotona® both occur in the Gulf 
of Manaar, although I have not been so fortunate as to find 
examples of either. Cliona and Thoosa are well represented in the 
Indian marine fauna, while a specimen that would be assigned by 
Topsent to his genus Cliothosa has been found in a shell from the 
Andamans. I am not satisfied that this last ‘“‘ genus” represents 
more than a phase of certain species of Thoosa (see p. 22, postea). 
KEY TO THE GENERA OF CLIONIDAE. 
1. Microscleres essentially spirasters. 
A. Macroscleres both amphioxi and styli (usu- 
ally tylostyli), or either alone; if both 
present the amphioxi never the larger. 
Microscleres often variable and sometimes 
divisible into two groups but never of two 
quite distinct kinds is : 
B. Macroscleres amphioxi and tylostyli, of 
which the former are the larget. Micros- 
cleres slender, elongate, zig-zag spirasters 
and short, stout, irregularly contorted 
oiesy .:: a oe .. Clionopsis. 
C. Macroscleres reduced to minute simple styli 
or amphioxi and confined to the external 
papillae. Microscleres relatively large 
spiral spirasters and minute straight ones 
of amphiaster-like form = .. Dotona. 
11. Microscleres essentially amphiasters. 
A. Macroscleres, if present straight or regu- 
larly curved amphioxi or tylostyli, 
occurring in the internal galleries. Typi- 
cal amphiasters consisting of a cylindri- 
cal stem bearing at or near both ends a 
ring of relatively large bosses and termi- 
nating in similar bosses.* Other forms 
Cliona. 
1 Thiele, Zool. Fahrh., suppl. VI, Vol. III, p. 412 (1905): Topsent, Bull, 
Mus. Oc€anog. Monaco, No. 120 (1908). : 
2 The fullest description, illustrated by numerous figures, is that given by 
Topsent in his ‘‘ Etude monographique des Spongiaires de France '’ (Arch. Zool. 
expérim. VIII, p. 24: 1900). The original description, by Carter, is in Fowrn. 
Roy, Micro. Soc. II, p. 493 (1879). Pi 
8 Carter, Ann. Mag. Nat. Hist. (5) V1, p. 57 (1880): Topsent, ‘‘ Spongiaires 
des Agores,’’ Res. Camp. Sci. Monaco, XXV, p. 108 (1904). ; 
4 In Thoosa laeviaster, described on p. 22, both lateral and terminal bosses 
are reduced to smooth conical projections. 
