474 EXPLANATION OF THE LETTERING. 







b.pl Basilar plate. 



br Brain; brain chamber; procephalic lobes. 



bran. . Branchia;. 



br.c . . Branchiocephalon. 



br.ct. . .Branchial cartilage. 



b.t. ... ... .Branchial temperature organs. 



b.t.hm or b.t.m . Branchio thoracic or hypobranchial muscle. 



b.th.n .Branchio thoracic nerve. 



b.v. . . Blood-vessel. 



c 1 " 3 . . Lines of canal organs. 



c Cancellae; corneal membrane; ccelom. 



c.ap ... Cephalic appendages. 



cap.b Capsuligenous bar of the endocranium; chilarial bar 



card. g. or cd.g. ... .Cardiac ganglion. 



card.m. . . Cardiomeres. 



card.s . . Cardinal sinus. 



c.c Canalis centralis; colar coelom. 



c.ca . Conical pulp cavities. 



c.d. . Cephalic disc. Cephalic duct. 



c.cl. Procephalic coelom. 



c.cn. Collar nerve. 



c.co. . .Cephalic caecum. 



cer. . . . .Cerebrum. 



cerbl Cerebellum. 



cer.p Cerebral peduncles 



c.f . . Cranial floor. 



c.g Corneagen layer; cephalic ganglia; caudal neuromeres. 



chila Chilaria. 



ch.g Cheliceral ganglion. 



ch.H.c Chelicero-hemisphere cells. 



ch.H.tr. Chelicero-hemisphere tracts. 



ch.l . .Cheliceral lobe. 



chl.b. .Chilarial cartilage bar of endocranium. 



chlic. .... ... Chelicerae. 



ch.pl Chilarial pleurite. 



ch.t .Chitenous tubule. 



cl Cloaca. 



c.l Cancellous layer. 



c.ms . Cephalic mesoderm. 



c.n .Procephalic neuromeres; cancella?. 



c.nar or c.nv Cephalic navel; dorsal organ; hsemostoma. 



cn.c Neural canal; neuroccele. 



cnl. . . . . Canaliculi. 



co Commissure. 



co.c Cerebral commissure cells; corona ciliata. 



co.f Cerebral commissural fibers. 



co.n Nerve to corona ciliata. 



cort Cerebral cortex. 



cox Coxal spurs. 



c.p Collar pore. 



cr Branchial cartilage of embryo 



