THE ECHINODERMS OF CEYLON. 85 
5. Heterometra reynaudu (J. Miller).—Fifty-five specimens, 
three of which are noticeably larger and with longer 
arms than the rest. 
6. Dichrometra protecta (Litk.).—Two specimens. 
7. Dichrometra tenera (Hartl.).—One fine specimen with 
40 arms and the cirri XL., 22-25. 
8. Cenometra herdmani, A. H. C.—A calyx with the cirri 
and 2 arm-bases attached. In A. H. Clark’s 
‘*Crinoids of the Indian Ocean,” on p. 154, are given 
figures of a cirrus of this species, labelled ‘‘ Ceno- 
metra insueta,’ while on p. 156 similar figures of 
a cirrus of that species are labelled ‘‘ Cenometra 
herdmani.”’ Mr. Clark’s description of the difference 
between the two species is correct ; he tells me that 
the labels on these figures have been unfortunately 
interchanged. 
9. Tropiometra encrinus, A. H. C.—Two characteristic 
specimens. 
10. Tropiometra indica, A. H. C. 
Cirri XXV., 22, 23, about 20 mm. long ; middle and distal 
joints 1 mm. long, 1 mm. wide, and 1°5-1:75 mm. thick. 
Centrodorsal 7-8 mm. across, thick and discoidal, with cirri in 
one, and a partial second, row. Brachials very low, less than a 
millimeter thick (longitudinally), even when the distal margin 
measures 4°5 mm.; near base of arm there are 14 brachials 
(including two syzygial joints) in a centimeter ; beyond middle 
there are 18 or 19 brachials (including two syzygial joints) to a 
centimeter. Distal margin of basal brachials very uneven 
and irregular, slightly flaring, not at all serrate or spiny ; there 
are at least three evident projections, the largest near the base 
of the pinnule, but separated from it by a re-entrant curve, the 
smallest on the other side of the brachial and the third median 
in position. This third projection becomes increasingly 
conspicuous on each succeeding brachial, until at the middle 
of the arm it is a rough projecting knot or rounded tooth. 
Distally it gradually decreasesin size and disappears. Pinnules 
