6 Records of the Indian Museum. 
B. All the macroscleres tylostyles. 
1. Shaft of macroscleres bearing a 
single convex ring a short dis- 
tance below the head : 
2. Shaft of tylostyles normally 
smooth. 
a. Tylostyles definitely of two 
sorts; one sort normal, the 
other very short and bearing a | 
sharp subsidiary spine at its 
point .. ‘e ; 
b. No‘‘ mucronate” spicules of 
this type. 
i. Spines on all the microscle- 
res very small and set close 
together; two groups of 
zigzag microscleres, one very 
slender 
ii. Spines on microscleres stout, 
very irregular, often blunt 
but never widely separated ; 
microscleres not divisible 
into two groups 
iii. Spines of microscleres rela- 
tively long, sharply pointed, 
normally arranged in a spi- 
ral band winding round the 
spicule. 
a, Some of the macroscleres 
conspicuously but gradu- 
ally expanded before nar- 
rowing to the point; hair- 
like tylostyles not present. 
B. None of the macroscleres of 
expanded form ; hair-like 
tylostyles, sometimes with 
. spiny heads, often present. 
iv. Spines of microscleres as in 
ili, but arranged in asinuous 
band outlining one side of 
the spicule 
C. All the macroscleres amphioxt. 
(Microscleres short, straight, ap- 
peoaching the amphiaster type in 
different degrees) ibs 
II. Species without microscleres. 
Macroscleres both diactinial and tylostyle. 
1. Diactinial spicules hair-like, fasci- 
C. 
C. 
[ Von. Soe; 
. C. annulifera.* 
. C. mucronata.* 
. C. indica. 
. C. michelin. 
enstfera.* 
viridis. * 
*, ortentalis.* 
C. acustella.* 
culated .. ns > G, Colaba. AB).™ 
