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TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



EXPLANATION OF PLATES. 



Reference Letters. 



a. c. ep. = Ant. oil. epaulette. 



ad. = Adambulacral plate. 



ad. m.= Adult mouth. 



a. 1. a. = Antero-lateral arm. 



an. = Anus. 



a. p.= Apical plate. 



arc. — Archenteron. 



hi. = Blastopore. 



6. t. = Buccal tentacles. 



e.h.— Ciliated band. 



c.c = Ciliated cells. 



cl. c. r. = Circum-oesoph. calcar. ring. 



cl. w. = Calcareous wheels. 



en. = Central plate. 



dc. = Disc of adult. 



d. f. = Disc for fixation. 



ech. = Echinus rudiment. 

 ep. = Epaulettes. 



gr. p. = Green pigment. 



hd. g. = Hind gut. 

 hy. = Hydrocoel. 



int. = Intestine. 



I. a. c. = Left anter. coelom. 

 I. c. =Left coelom. 

 I. I. a. = Left larval arm. 

 l.p.c. =Left poster, coelom. 



m. = Mouth. 

 md. g. = Mid-gut. 

 mes. = Mesenchyme. 

 m.f. = Muscular fibres, 

 m. p. = Madreporic pore. 

 m. pi, — Madreporic plate. 



p. a. = Papillae for temp, fixation. 



p. c. = Pore canal. 



p. c. ep. = Poster, ciliated epaulette. 



pd. = Pedicellaria. 



pi. v. = Polian vesicle. 



pr. o. a. =Pre-oral arm. 



pr. o. I. = Pre-oral lobe. 



pto. d. a. = Postero-dorsal arm. 



pt. o. a. = Post-oral arm. 



pto. I. a. = Postero-lateral arm. 



r. a. c. = Right anter. coelom. 



r. c. = Right coelom. 



rl.— Radial plate. 



r. I. a. = Right larval arm. 



r. p. c. = Right poster, coelom. 



r. w. v. = Radial water vessel. 



sJc. p. — Skeletal plates. 



sk. r. = Skeletal rods. 



sk. rs. = Skeletal rosette. 



sp. = Spine. 



sph. — Sphaeridium. 



st. = Stomach. 



std. = Stomodoeal invagination 



ten. = Tentacles. 

 t. /.= Tube-feet. 

 tl. = Terminal plate. 



u. ah. p. = Unpaired aboral process. 

 u. t. = Unpaired tube-foot or tentacle. 



yl. p. = Yellow pigment. 



