394 



PROCEEDINGS OF THE ACADEMY OF 



[May, 



Con.V., contractile vacuole. 



C.T., compressor trunci. 



Cut., cuticula. 



D.A., dorsal coronal arm or lobe. 



d.c, deflexor coronte. 



D.GL, dorsal gland. 



Dia., diaphragm. 



D.M., dorsal longitudinal visceral mus- 

 cle. 



D.Sens.O., dorsal sense organ. 



d.tr. I-IV, depressor trunci primus- 

 quartus. 



E., eye. 



F., foot. 



F.Gl., foot gland. 



Fl.C, nephridial flame cell. 



Ful., fulcrum inci. 



Hyp., hypodermis. 



Inf., infundibulum (coronal cup). 



L.A., lateral coronal arm or lobe. 



I.e., levator corona;. 



L.-C.M., longitudino-circular muscle. 



L.M., lateral visceral longitudinal mus- 

 cle. 



L.Sens.O., lateral sense organ. 



M., mouth aperture. 



Man., manubrium mallei. 



Mast., mastax. 



Muse, muscles. 



Musc.C, muscle cell body. 



N., nucleus. 



N.c, nerve cell. 



N.com., nerve fiber commissure. 



Neph., nephridial canal. 



Neph.C, nephridial cell. 



Neph.com., nephridial commissure. 



N.f., nerve fiber. 



O., Ovum. 



Oes., oesophagus 



Oes.T., oesophageal tube. 



Ov., germarium. 



Ovd., oviduct. 



Ovg., ovogonium. 



Ped., peduncle of foot. 



P. Int., posterior intestine. 



Prov., proventriculus. 



R.c. I-VI, retractor coronse primus- 



sextus. 

 Ram., ramus inci. 

 Rec, rectum. 

 R.M., retractor mastacis. 

 Sph.An., sphincter ani. 

 Sph.C. I-VIII, sphincter coronas prim- 



us-octaviis. 

 Sph.tr. I-VI, sphincter trunci primus- 

 sextus. 



Sp.S., sperm sac. 

 Stoni., stomach. 

 Stom.Gl., stomach gland. 

 Test., testis. 

 Tub., gelatinous tube. 

 Un., uncus mallei. 

 V.A., ventral coronal arm or lobe. 

 Vac, vacuole. 

 V.D., vas deferens. 

 Vest., vestibulum. 

 V.M., ventral visceral longitudinal 



muscle. 

 X., cuticular ridge. 

 Yk.N., necleus of yolk cell. 



Plate XVIII. — All the figures refer to Apsihis vorax. 



Fig. 1. — Dorsal view; this and figs. 2-4 represent fully expanded individuals. 

 Figs. 2, 3. — Lateral (from the right side) and ventral views respectively, 



the details of the alimentary tract not slio^Ti. 

 Fig. 4. — Newly hatched immature individual, about one-third the size of the 



adult, the musculature and cuticula not shown. 

 Fig. 5. — Left half of the mastax viewed from above. 

 Fig. 6. — Cerebral ganglion and its nerves, sense-organs, anterior portion of 



the nephridia, and contiguous muscles. 

 Figs. 7, 8. — Two consecutive transverse sections of a cerebral ganglion, 



camera drawing. 



Plate XIX, Figs. 9-18. — Stephanoceros fimbriahis. 



Fig. 9. — Trunk seen from the left side, only the proximal portions of the coro- 

 nal arms and the foot shown, details of the mastax not drawn. In 

 this as in figs. 10 and 11 only the larger muscles are delineated, and 

 those only in part. 



Fig. 10. — Dorsal view of trunk. 



Fig. 11. — Oblique ventral view of anterior trunk region with a portion of the 

 coronal lobes. 



Figs. 12, 13. — The distal ends of two coronal arms, the first on dorsal and the 

 second on lateral view. 



Fig. 14. — Distal end of foot with its peduncle. 



Fig. 1.5. — A nephridial flame cell. 



