SEA-FISHERILS 
LABORATORY. 955 
EXPLANATION OF PLATES. 
Reference Letters. 
Al.c.1. cesophagus. 
Al.c.2. stomach. 
Al.c.3. straight division of the 
intestine. 
Al.c.3'. sac of crystalline style. 
Al.c.3". digestive division of the 
| straight intestine. 
Al.c.4. spiral division of the 
intestine. 
Al.c.5. coiled division of the in- 
testine. 
Al.c.6. rectum. 
An. anus. 
Add.a. ant. adductor muscle. 
Add.a'. ant. adductor impres- 
sion, 
Add.p. post. adductor muscle. 
Add.p', post. adductor impres- 
sion. 
Art.pa. anterior pallial artery. 
Art.pp. right posterior pallial 
artery. 7 
Art.pp'. left post. pallial artery. 
Art.vp. viscero-pedal artery. 
Art.v. visceral artery. 
Art.p. pedal artery. 
A.lab. right and left labial 
arteries. 
Ao. aorta. 
Aur, auricle. 
Ba. bulbus arteriosus. 
Br'. base of right ctenidium. 
Br. H. external branchia, 
Br-I, internal branchia. 
Br.H.1. inner lamella, external 
branchia. 
Bites (UIE © a. 5: » 
53g A ome 
pile? iaiieie maar i #3 
silos f 3 a 
membranous portion. 
» internal ,, 
Br.aff. com. afferent branchial 
vessel. 
Br.eff. com. efferent branchial 
vessel. 
Br.eff'. efferent branch. vessel. 
Br.aff'. afferent branch. vessel. 
Brj.1. inter-filamentar junct. 
Bry.2. inter-lamellar junction. 
By.g. byssus gland. 
By’. pedal groove. 
By. byssus thread. 
Com. cerebral commissure. 
Con.cv. cerebro -visceral con- 
nective. 
Con.cp. cerebro-pedal connec- 
tive. 
Dg. digestive gland. 
Hp.JI.1. epithelium of wall of 
crystalline style sac. 
Ep.I.2. elongated cells in wall 
of crystalline style sac. 
EpI.3. epithelium of intestinal 
div. of straight intest. 
Ep.op. pigment cells of an eye. 
Ep.p. epidermis of the foot, 
