MECHANISM OF SUCTION IN SCHIZONEUKA LANIGERA. 



329 



• EXPLANATION OF THE PLATES. 



Reference lettering. 



a.d. 



a.f. 



ant. 



h.c. 



h,l 

 c.ep. 



c.s.d. 

 cl. 



cl.f. 



cl.l. 

 cl.sc. 

 conn. 



d.tn. 

 e.c. 



epc, 



ep. 

 ep.gr. 



f.h. 

 f.h. 



(J.O. 



hs. 



hyp. 



hyp.l. 



Ihr. 



Ibm. 



Ibr.g. 



Ipr.g. 



md. 



md.l. 



md.pr. 



md.re. 



Antero-dorsal arms of the ten- 

 torium. 

 Antero-veutral arms of the ten- 



toi'ium. 

 Thin chitinous fold joining fore- 

 head to epicranium. 

 Antenna. 



Buccal cavity. 



Buccal fold. 



Stout chitinous mass formed at 

 the beginning of the pharynx 

 by junction of clypeal folds 

 and internal walls of hypo- 

 pharynx. 



Common median salivary duct. 



Clypeus. 



Clypeal fold. 



Clypeo-labrum. 



Clypeal sclerite. 



(Esophageal connective joining 

 supra- and sub-cesophageal 

 ganglia. 



Bivaricator muscles of pharynx. 



Ejector canal (salivary) formed by 

 meeting of maxillary stylets. 



Proximal part of head (epi- 

 cranium). 



Epipharynx. 



Longitudinal groove on epipha- 

 rynx. 



Ventral wall or floor of fore-head. 



Fat-body cells. 



Gustatory organ. 



Hypodermis. 



Hypopharynx. 



Hypopharyux lip. 



Labrum. 



Labium. 



Longitudinal groove on labrum. 



Longitudinal groove on proboscis. 



Thin post-lateral walls of head. 



Mandibles. 



Mandibular lever. 



Protractor muscles of mandibles. 



Retractor muscles of mandibles, 

 attached to antero-dorsal arms. 



md'.re. Retractor muscles of mandibles 

 attached to transverse plate. 

 m.d.f. Depressor muscles of fore-head. 

 m.d.p. Elevator muscles of fore-head. 

 md.o. Retort-shaped organs of man- 

 dibles. 

 mx.s. Maxillary stylets. 

 mx.re. Retractor muscles of maxillary 

 stylets, attached to transverse 

 plate. 

 mx'.re. Retractor muscles of maxillary 

 stylets, attached to antero-ven- 

 tral arms. 

 mx.p. Maxillary processes. 

 mx.sc. Maxillary sclerite. 

 mx.l. Maxillary lever. 

 7nx.f. Maxillary folds. 

 mx.sh. Integument of buccal cavity form- 

 ing a sheath round stylets. 

 mx.o. Retort-shaped organs of maxillary 

 stylets. 

 mx.pr. Protractor muscles of maxillary 

 stylets. 

 m.t. Median vertical tendon to which 

 the divaricator pharyngeal mus- 

 cles are attached. 

 m.e.p. Elevator muscles of transverse 

 plate. 

 CBS. CEsophagua. 



p.c. Pump-cylinder enclosing pump- 

 chamber. 

 p.ch. Pump-chamber. 

 p.m. Pump-muscle. 

 p.w. Post-dorsal wall of clypeus (fore- 

 head). 

 pp. Pharynx prottiberances. 

 p.v.iv. Post-ventral border of fore-head. 

 ph. Pharynx. 

 IJh.d. Pharyngeal duct leading from 

 the suction-canal into pharynx 

 proper. 

 ph.o. End of pharynx and beginning of 



oesophagus. 

 2)r.iv. Flexible proximal wall of labium. 

 pr. Labium (proboscis). 

 p>.s. Pump-stem. 



