Turner, Ncrvoiis System of Cypris. 43 



EXPLANATION OF PLATES. 



Excepting where otherwise stated, the plates were all made from camera 

 drawings made by the writer. 



PLATE IIL 



Fig. I. Cypris herrickiTwrntr, transverse section of body in the region 

 of the posterior portion of the mid-gut. A, endoskeleton ; n, nerve chain. 



■Fig, 2. Do., do., transverse section of median eye. 



Fig. J. Z)i7., a'(3., longitudinal section of circum-oesophageal commissure, 

 a^, antennary nerve; md, mandibular nerve. 



Fig. 4. Do., do., transverse section of the sense organ of lower lip. 



Fig. J. Transverse section of the endoskeleton. 



Fig. 6. Do., do., transverse section of the body in the region of the lat- 

 eral diverticles of the mid-gut. 



PLATE IV. 



Fig. 7. Cypris hcrricki Turner, longitudinal section through the sub- 

 oesophageal ganglion. Mx', mandibular nerve ; mx", 1st maxillary nerve. 



Fig. 8. Do., do., longitudinal section through the brain at the level of the 

 origin of the circum-oesophageal commissures. A^, antennary nerve. 



Fig. 9. Do., do., median longitudinal section of the entire body. S.g., 

 brain; A, harp-shaped sense organ of the lower lip; B, ventral nerve chain; 

 C, cells in wall of oesophagus. 



Fig. 10. Do., do., transverse section through the brain, in the region of 

 the optic and antennulary nerves. 



Fig. II. Do., do., longitudinal section of a portion of the ventral chain. 



PLATE V. 



Fig. 12. Candona delawarensis Turner, olfactory seta from the third joint 

 of the antenna. 



Fig, ij. Candona faicb/onnis (Fischer), do., do. 



Fig. 14. Cypridopsis vidua (O. F. Miiller), do., do. 



Fig. IJ. Cypris herricki. Turner, do., do. 



Fig. 16. Cypris herricki Turner, longitudinal section through the body. 

 A.N., antennulary nerve; B, harp-shaped sense organ of the upper lip ; C, harp- 

 shaped sense organ at the base of the mandibular teeth ; D, harp-shaped sense 

 organ in the lower lip; E, auditory organ; L.N., labial nerve; P, pear-shaped 

 sense organ of the upper lip ; S.G., supra-oesophageal ganglion. 



Fig. ly. Cypris fuscata Jurine, olfactory seta from the third joint of the 

 antenna. 



Fig. 18. Cyclocypris laevis (O. F. Miiller), do. 



Fig. ig. Cypria exculpta (Fischer), do. 



Fig. 20. Candona fabaformis (Fischer), sensory seta from tip of Hrst 

 antenna. 



Fig. 21. Cypria ophthalmica (Jurine), sensory seta from third joint of 

 antenna. 



Fig. 22. Cyclocypris laevis (O. F. Miiller), do., do. 



