1901.] 



NATURAL SCIENCES OF PHILADELPHIA. 



735 



D.m.cr., dorsal muscular cross. 



Dl. V-, dorso-lateral blood vessel. 



(It., duct. 



E.I., end intestine. 



Ep., epithelium. 



Ep.3I., epithelial muscle. 



Bp.p.s., epithelium of proboscis 



sheatb. 

 Ep.m.f., epithelial muscle fibrils. 

 End.., endothelium. 

 Exc.d., excretory duct. 

 G. C, ganglion cell. 

 O.C.i, ganglion cell I. 

 G. Cii, ganglion cell II. 

 G. Cm, gang ion cell III. 

 Gl-i, red staining gland cell. 

 01.2, blue-staining gland cell. 

 Gl.R., glandular ridge. 

 Gon., gonad. 

 Gon.W., gonad wall. 

 H.M., horizontal muscle. 

 H. v., head blood vessel. 

 i. CM., inner circular muscle. 

 i.L.M., inner longitudinal muscle. 

 i.B.L., inner basement layer. 

 i.Ep., inner epithelium. 

 i. O.mb., inner egg membrane. 

 f. Cce., intestinal caecum. 

 L.O., lateral groove. 

 L.M., longitudinal muscle. 

 L.M.f., longitudinal muscle fibre. 

 L.M.p.s., longitudinal mu.?cle of 



proboscis sheath. 

 L.N., lateral nerve. 

 L. F., lateral blood vessel. 

 I.D.N. , lower dorsal nerve. 

 mes., mesenchym. 

 M., mouth. 

 m.b., middle piece. 

 M. v., median blood vessel. 

 M.I., middle intestine. 

 M.S., muscle strand. 

 N.J nucleus. 

 N.^, nucleus that has divided ami- 



totically. 

 N.Par., nucleus of parasite. 

 n., nucleolus. 

 n.tiac., nucleolar vacuole. 

 n.p., nerve plexus. 

 Nph., nephridia. 

 Nph.D., nephridial main duct. 

 NpJi.d., nephridial ductule. 

 Oes., oesophagus. 

 Oe.N., oesophageal nerve. 



Oe.NComm., oesophageal nerve 

 commissure. 



Oe.Ep., cesophageal epithelium. 



Oo., ovary. 



0., ovarian egg. 



<7 ,, youngest ovarian egg figured. 



0.2, slightly older than 0,. 



0.3. slightly older than O^. 



0. O.mb. , outer egg membrane. 



o.Ep., outer epithelium. 



0. CM., outer circular muscle. 



O.B.L., outer basement layer. 



P., proboscis. 



P.N., proboscis nerve. 



P.S., proboscis sheath. 



P.p., proboscis pore. 



Par., parasite. 



Pc, rhynchoccel. 



Rd., rhyncbodajum. 



Rd.m., rhynchodseum muscle. 



Rc.Ep., rhynchocoel epithelium. 



Rhb., rhabdites. 



r.m.f., radial muscle fibres. 



8., stomach. 



S.Ep., stomach epithelium. 



S. C, supporting cell. 



Sec, secretion. 



St., stalk. 



Spff., spermatogonia. 



Spz., spermatozoa. 



1\, testis. 



T.d., testis duct. 



Th., secretions (?) of proboscis epi- 

 thelial cells. 



T.B., terminal bulb. 



U.D.N., upper dorsal nerve. 



it.k., upper knob. 



V. Comm., ventral commissure. 



V.L., ventral lobe. 



V.bl.con., ventral blood connective. 



V.m.cr., ventral muscular cross. 



w., subepithelial cesophageal gland 

 cells. 



.v., intracellular ciliary prolongations. 



A'(/., dorsal muscular cross of probos- 

 cis. 



Xv., ventral muscular cross of pro- 

 boscis. 



y., attachment of proboscis to body 

 wall. 



yk., yolk. 



s., bending out of fibres from inner 

 part of proboscis sheath. 



Plate XL, Fig. 1. — Diagrammatic horizontal optical section of the 

 anterior part of the body. 



Fig. 2. — Combined drawing of parts of a cross section of the body epi- 



