362 TRANSACTIONS LIVERPOOL 15IOL0GICAL SOCIETY. 



EXPLANATION OF PLATES 



Reference Letters 



A. 6»c.= Buccal artery. 



A. c. = Anterior aorta. 



A. ct<<.' = Cutaneous artery. 



A . col. = Columella artery. 



A. 5r. = Gastric artery. 



A. gro.= Gonad vessels. 



A. pffZ/. = Pallial artery. 



A. ped. = Pedal artery. 



A. pen. = Penis artery. 



A. vis. = Visceral artery. 



Af. c<. = Afferent branchial vesse 



^w. = Anus. 



Ao. = Aorta. 



Br. V. = Branchial vessels. 

 /;kcc. = Buccal ganglia. 

 c.= Cerebral ganglion. 

 C. c. = Occlusor muscle. 

 C. cat;. = Blood spaces in oeso- 

 phagus. 



C. p. =Cerebro pedal connective, 

 c. d. m. =Centro dorsal muscle. 

 c. r/r. = Granular cells of renal 



lamella. 

 Caec. = Oesophageal caecum. 

 cae. w. — Connective tissue of cacc. 



wall. 

 cart. = Cartilage. 



cer. com. = Cerebral commissure. 

 Col. wnw. = Columella inuscle. 

 Con. ^= Connect- tiss. gland of 



Leiblein. 

 Cow. =Connective tissue. 

 Cor. — Cornea. 

 C<. =Ctenidium. 

 ct. ax. =Ctenidial axis. 

 ct. COM. = Connective tissue of gill 



leaflet. 

 r.t. c.' = Epithelium of gill leaflet. 

 ct. fi/). =Ctenidial epithelium. 

 ct. f/i. = Connect, tissue of ctenidial 



axis. 

 ct. wM<.s. = Ctenidial muscles. 

 ct. w.= Ctenidial nerve. 



D. m. s. = Dorsal trans, muscle 

 sheet. 



D. pr. m. = Dor.sai protractor 



muscles. 

 Z)j/." = Lobe of stomach. 

 Dr/.c." /)(7.c.' = Cells of digestive 



gland. 



Z)(7. coj;. = Connective tissue of 



gland. 

 Dg.d. = Opening of post, digestive 



gland duct. 

 £>[/.£/.' = Opening of ant. dig. gland 



duct. 

 Dg. gl. = Digestive gland. 

 Dg. gr. = Granules of gland cells. 

 Dg. 7H(C. = Nucleus of gl. cell. 



I. Ef]. rt. = Efferent branchial vessel. 



Foot = Foot. 



Fall. ep. = Follicular epithelium. 



Ge. e/j. = Germinal epithelium. 

 Gl. c. = Gland cells. 

 Go. = Gonad. 



/.r./\ = Dorsal retractor muscles. 

 L.t.b. = Lateral odontophoral 



bands. 

 Lam. 25?'. = Lamellae of secondary 



system. 

 Lam. t;. = Vein of renal lamella. 

 Lens = Lens. 

 Ling. cow. = Connective tissue of 



odontophore. 

 Ln. (/.= Gland of Leiblein. 



M. = Mouth. 



ni,.v.r. = Median ventral muscles. 

 jnetn. = Membranous wall of larva. 

 Mu. gl. = Mucous gland. 

 Mus. ciVc. = Circular muscles. 

 Mus. coZ. = Transverse sections of 

 mus. fibres. 



A'. a.r.= Nerve of ctenidial axis. 

 n.ot. = Otocyst nerve. 

 neph. grL = Nephridial gland. 

 A'^-MC. = Nucleus. 



Nuc. Int. C. = Nuclei of instersti- 

 tial cells. 



O. cnv. = Lumen of oesophagus. 

 Of. con. = Connective tissue with 



longitud. muscles. 

 oe. cow. ' = Connective tissue. 

 OC.S-. = Oesophagus. 

 Op. = Operculum. 

 Op. ?i. = Optic nerve. 



