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oc. di. Antero-inferior dilator muscle of the oesophagus. 



oe. as. Autero-superior dilator muscle of the oesophagus. 



oe. 1. Lateral dilator muscle of the oesophagus. 



o. e. m. Outer flexor muscle of the first maxilla. 



oe. p. Posterior dilator muscle of the oesophagus. 



o. a: Outer flexor muscle of the scaphog lathite (o.ex.s., Fig^. 27, 31). 



o. f. Outer extensor muscle of the scaphognathite. 



o. f. m. Outer extensor muscle of the first maxilla. 



o. g. Optic ganglion. 



o. 1. s. Outer lamellar sinus. 



o. m. c. -Ophthalmic muscle chamber. 



o. m. ex. Outer median flexor muscle of the soaphog :athite. 



o. m. f. Outer median extensor muscle of the scaphognathite. 



om. n. Oculo-motor nerve. 



o. 11. Optic nerve. 



o. n. fib. Optic nerve fibres. 



op. Operculum of excretory opening. 



op 1 . Inner side of operculum. 



op. b. s. Ophthalmic blood sinus. 



o. ped. Optic peduncle. 



o. py. Pyloric ossicle. 



orb. Orbit. 



ov. Ovary. 



ov. art. Ovarian artery. 



ovd. Oviduct. 



P. Propodite. 



P. 14. Walking legs 1 to 4. 



p. 1 2. 1st and 2nd abdominal appendages of male. 



p. ace. Posterior accessory muscle of the scaphognathite. 



p. c. p. Pro-cephalic processes. 



ipec. Pectineal ossicle. 



ped. Eye peduncle. 



Per. Pericardium. 



per. gl. " Pericardia! pouch." 



p. ex. B. Tendon of the posterior extensor nuiscie of the basi-ischium. 



p. f. B. Tendon of the posterior flexor muscle of the basi-i-chium. 



p. g. Parorsophageal ganglion. 



pg. c: Pigment cell. 



pg. i. Inner pigmented layer of the eye. 



p. g. n. Posterior gastric nerve. 



pg. o. Outer pigmented layer of the eye. 



pig. 1. Pigment layer. 



pi. art. Postero-lateral artery. 



p. U). Progastric lobe of the bladder. 



p. mes. Posterior mesopyloric ossicle. 



p. n. Postero-lateral nerve. 



pod. br. Podobranch. 



p. o. Ib. Post-oesophageal lobe of the bladder. 



p. ost. Posterior ostia of the heart. 



pp. Pleuropyloric wall. 



p. pec. Prepectineal ossicle. 



prot. Protopodite. 



pr. p. Propyloric ossicle. 



p. s. a. Posterior supra-ampullary ossicle. 



pt. c. Pterocardiac ossicle. 



pt. pec. Post pectineal ossicle. 



pyl. Pyloric region of the fore-gut. 



py. lat. Lateral pyloric muscles. 



