934 



PROFESSOR W. C. M'INTOSH AND MR E. E. PRINCE ON 



LIST OF REFERENCE LETTERS. 



a. 



anus. 



gc. 



germinal cavity. 



peh. 



pigmented layer of choroid. 



abd. 



abdomen. 



gi- 



glomerulus. 



pes. 



perichordal (mesoblastic) sheath. 



ab. 



air-bladder. 



ll. 



heart. 



par. 



parachordals. 



ac. 



anterior commissure. 



ha. 



haemal arch. 



pd. 



pericardial chamber. 



of. 



anal fin. 



hb. 



hind-brain. 



per. 



periblast. 



al. 



alar expansion of scutum (6s.). 



hg. 



hind-gut. 



Pf- 



pectoral fin ; also pale commissural 



ao. 



aorta. 



hm. 



hyomandibular arch. 





fibres. 



aob. 



aortic bulb. 



htnc 



, , cleft. 



pg- 



pectoral girdle. 



ar. 



artery. 



hr. 



rudiment of heart. 



pip. 



palpocils. 



au. 



otocyst (early condition). 



hyd 



hyoid element. 



pn. 



pineal gland. 



auc. 



auditory capsule. 



hyp. (or hy. ) hypoblast. 



po. 



primitive germinal cells. 



aur. 



auricle. 



i. 



iter a tertio ad quartum ventri- 



poa. 



, , opercular aperture. 



b. 



brain. 





culum. 



pq. 



or ptg. palato-quadrate cartilage. 



be. 



body-cavity. 



inf. 



infundibulum. 



pr. 



also my. ) protovertebrse. 



bd. 



blastodisk (before segmentation). 



inn. 



interneural (spinous) cartilages. 



pre. 



pronephric chamber. 



bdm 



, , (after segmentation). 



ir. 



iris. 



prs. 



primitive streak. 



bl. 



blastomeres. 



iv. 



subintestinal vein. 



pm. 



pronephros. 



ble. 



blood-corpuscles. 



k. 



kidney. 



pm' 



,, opening into pre. 



Mr. 



urinary bladder formed by union of 



Kv. 



Kupffer's vesicle. 



ps. 



peri vitelline space or " breathing 





segmental ducts. 



1. 



lens. 





chamber." 



bp. 



blastopore. 



Ir. 



liver. 



pt. 



pituitary body. 



br. 



blastodermic rim. 



11. 



lower layer (primary entoderm) 



ptg. 



pterygo-quadrate. 



bra. 



branchial arches. 





cells. 



pv. 



portal vein. 



brc. 



,, clefts. 



ly. 



lymphatic mass in front of kidney. 



pz. 



parietal zone of blastoderm (resem- 



bs. 



blastodermic shield. 



U. 



lobi inferiores. 





bling the Avian zona pellucida). 



car. 



carina, or ventral ridge of early 



m. 



mouth. 



quad, quadrate part of mandibular arch. 





embryo. 



ma. 



meridional areas of protoplasmic 



rb. 



rib. 



cart. 



cartilage. 





transference. 



sb. 



swim-bladder. 



can. 



canal (auditory, &c.) 



mb. 



mid-brain. 



sg. 



archinephric or segmental duct. 



caps. 



capsule. 



me. 



permanent medullary canal. 



sge. 



segmentation cavity. 



caud. caudal end of trunk. 



md. 



and mo. medulla oblongata. 



sd. 



segmental tubes. 



cb. 



cerebellum. 



me. 



mesenteron. 



S1I0. 



sensory organs. 



cdv. 



caudal vein. 



mel. 



membrana elastica externa. 



so. 



somatic mesoblast. 



ce. 



cerebrum, anterior fore-brain. 



mes. 



mesoblast. 



sp. 



splanchnic mesoblast. 



ceph. 



cephalic end of embryo. 



mg. 



mid-gut. 



sph. 



spherules. 



cf- 



caudal fin. 



mie. 



micropyle. 



spn. 



spinal nerve. 



ch. 



choroidal fissure. 



mn. 



mandible. 



ss. 



serous spaces around embryo. 



cl. 



clavicle. 



mro. 



musculus retractor oris. 



St. 



stomach. 



cp. 



cortical protoplasm. 



msn. 



mesentery. 



SV. 



sinus venosus. 



cs. 



cuticular (hypoblastic) notochordal 



mx. 



maxillary. 



th. 



thalamencephalon or posterior fore- 





sheath. 



my. 



myotomes, muscular somites, or 





brain. 



ct. 



cartilage, and connective tissue. 





myomeres. 



thl. 



lobes of roof of thalamencephalon. 



ctr. 



cornu trabecular. 



n. 



nucleus. 



thr. 



floor of thalamencephalic chamber. 



CO. 



cardinal vein. 



na. 



neural arch. 



Ir. 



trabecular. 



dc. 



ductus choledochus. 



nc. 



notochord. 



ts. 



tori semicirculares. 



df. 



dorsal fin. 



ncs. 



notochordal sheath. 



tl. 



,, longitudinales. 



drj. 



dorsal or medullary groove. 



ncu. 



nervous cushion (auditory). 



wo. 



urinary vesicle. 



due. 



ductus Cuvieri. 



ne. 



neurochord. 



V. 



vesicle. 



e. 



eye. 



nee. 



neurenteric canal. 



ven. 



ventricle (heart). 



ed. 



epidermis. 



nic. 



cellular ring of notochord. 



vf. 



ventral fins. 



ef- 



embryonic (marginal) fin. 



np. 



nuclei of the periblast. 



vn. 



vein. 



ep. 



epiblast. 



nv. 



nerve. 



vt 



ventricle (brain). 



ep. 2 



,, corneous. 



og. 



oleaginous sphere or globule. 



vth. 



vesicle of thalamencephalon. 



'/'■ 1 



neurodermal. 



ol. 



nasal pits. 



vs. 



blood-vessel. 



er. 



embryonic fin-rays. 



olf. 



olfactory lobes. 



X. 



variously used for special structures. 



fa. 



anterior transverse fibres. 



oln. 



,, nerves. 



y- 



yolk. 



/>>■ 



fore-brain. 



op. 



optic vesicle, also eye in later stages 



ys. 



yolk-sac or embryonic membrane. 



fbr. 



roof of fore-brain 





(oc. in some figures). 



zr. 



zona radiata. 



fg. 

 fa. 



branchial rudiments. 

 fornix of Gottsche. 



~„- 



/■vr^rnv-iiil ii tyi 







UpC vifvi\>uiunit 



opem. optic commissure. 



I. 



Olfactory nerve. 



9- 



gut. fg, fore -gut. 



opl. 



,, lobes. 



II. 



Optic nerve. 





my. mid-gut. 



oto. 



otoliths. 



III. 



Oculo-motor nerve. 





hg. hind-gut or rectum. 



ovf. 



valve-like flap of optic lobe 



VII. 



Facial and auditory nerves. 



b. 



gall-bladder. 



P- 



protoplasm. 



V. 



Trigeminal nerve. 



