PLATE XXXII. 



Fig. 48. Ventral view of Peridinium rectum, sp. nov. X 500. 



Fig. 49. Dorsal view of another individual of the same. X 500. 



Fig. 50. Ventral view of Amphidoma biconica, sp. nov. X 750. 



Fig. 51. Cell contents of same. X 750. 



Fig. 52. Skeletal inclusions of same. X 1650. 



Fig. 53. A^iew of right side of AmpMsolenia spinulosa, sp. nov. X 168. 



Fig. 54. Same, view of anterior end. X 1095. 



Fig. 55. Optical section of antapical region of same. X 1095. 



ABBBEVIATIONS. 



clir. — chromatophores. 

 p.p. — flagellar pore. 

 lid. — head. 

 n. — nucleus. 



nk. — neck. 

 pi. — plasma. 

 .s.sp. — suture spine. 

 IOC. — vacuole. 



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