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oe. at. — An tero -inferior dilator muscle of the oesophagus. 

 oe. as. — AnteroT-superior dilator muscle of the oesophagus. 



oe. I. — Lateral dilator muscle of the oesophagus. 



o. c. in. — Outer flexor muscle of the first maxilla. 



or. p. — Posterior dilator muscle of the oesophagus. 



o. er. — Outer flexor muscle of the scaphog lathite (o.ex.s., Fig<. 27, 31). 



o. f. — Outer extensor muscle of the scaphognathite. 



o. /. m. — Outer extensor muscle of the first maxilla. 



o. g. — Optic ganglion. 



o. I. s. — Outer lamellar sinus. 



o. m. c. — Ophthalmic muscle chamber. 



o. in. ex. — Outer median flexor muscle of the scaphog -athite. 



o. in. /. — Outer median extensor muscle of the scaphognathite. 



oin. ii, — Oculo-motor nerve. 



o. ii. — Optic nerve. 



o. /*. fib. — Optic nerve tibres. 



op. — Operculum of excretory opening. 



op\ — Inner side of operculum. 



up. Ii. ■<■■. — Ophthalmic blood sinus. 



o. ped. — Optic peduncle. 



o. py. — Pyloric ossicle. 



orb. — Orbit. 



ov. — Ovary. 



"/•. art. — < Ovarian artery. 



ovd. — Oviduct. 



P. — Propodite. 



P. 1—4.— 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. 



pec. — Pectineal ossirlc. 



ped. — Eye peduncle. 



Per. — Pericardium. 



per. gl. — " Pericardial pouch." 



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



p. j. B. — Tendon of the posterior flexor muscle of the basi-ischium. 



p. (j. — Paro; sophageal 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. I. — Pigment layer. 



pi. art. — Postero-lateral artery. 



p. lb. — Progastric lobe of the bladder. 



p. mes. — Posterior mesopyloric ossicle. 



p. n. — Postero-lateral nerve. 



pod. br. — Podobranch. 



p. o. lb. — Post-oesophageal lobe of the bladder. 



p. ost, — Posterior ostia of the heart. 



pp. — Pleuropyloric wall. 



p. pec. — Prepectineal ossicle. 



prot. — Protopodite. 



pr. p. — Pro pyloric 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. 



