On a New Brachiate Asteroid Larva. 199 
DESCRIPTION OF PLATE. 
Fic. 1. View of Brachiolaria hibernica from left larval (future oral) aspect of disc portion 
of larva, into which the preoral lobe with sucker and brachia is being drawn. x 24, 
The arm rudiments are indicated by Roman numerals, and the ciliated processes, now 
retracted, by ordinary numerals. The hydroccele pouches are marked by crosses, 
pouch I being at this stage almost opposite arm rudiment II, and pouch V almost 
opposite interradius I1/V. The great width of the oral and aboral brachiolarian 
notches, v.c. the spaces between arm rudiments I and II and between hydrocele 
pouches I and V, will accordingly be noted. N is placed on a prominence of soft 
tissues in the aboral notch. M indicates the former position of the mouth opening. 
Fig. 2. View of same larva from right side but tilted over, showing the brachia 
in profile view. x 24. The remains of the larval ciliated processes are seen better 
than in Fig. 1, The post-oral process is the one most reduced. 
Lettering in Figs. 1 and 2. 
I, II, II, The aboral arm rudiments numbered according to scheme explained in 6, 
etc. p. 276. 
1, 2, 3, 4,6 The remains of the larval ciliated processes in the following sequence :—dorsal 
median, anterior dorsal, posterior dorsal, postero-lateral, and preoral. 
AED aE Position of the hydrocele pouches. 
Br.a., Br.l., Br.r. The anterior, left and right brachia respectively. 
M ° Remains of larval mouth. 
N Temporary prominence of soft tissues in the brachiolarian notch. 
Fie, 3. View of advanced larva of Lwidia ciliaris from ventral aspect. x 18. The 
broadening at the anterior end of the dorsal median lobe is in certain states of 
contraction relatively greater than here indicated. 
Lettering in Fig. 3. 
1, 2, 3, etc. The various larval ciliated appendages (see explanation in text). 
A Anus, j 
Gr. Groove between the preoral and post-oral ciliated bands. 
M. Mouth. 
Po. Bd, and Pr.Bd. The post-oral and preoral ciliated bands respectively. 
(Issued separately, 18th May 1915.) 
