114 



Explanation of Plate X. 



Fig. I. — Sapphirina Edwardsii, Haeckel, viewed from the ventral 

 surface, and showing the course of the alimentary canal, the dis- 

 position of the dermal glands, fat spheres, eyes, and ramifications 

 of the nervous system. (Note : The muscles, genital organs and 

 swimming feet, etc., are omitted.) 



Fig. II. — Anterior portion of cephalic region of same species, showing 

 in greater detail the arrangement of the eyes, fat-body, dermal 

 glands and nerve connections. 



Fig. III. —Posterior "maxilliped" (really a branch of the second 

 maxilla) ; same species. 



Fig. IV. — Caudal plate ; same species. 



Fig. V. — Combination of a single-celled dermal gland and a terminal 

 ganglion cell with its sensory bristle ; same species. 



Fig. VI. — Sapphirina Gegenbauri, Haeckel, ventral view to show bhe 

 eyes, alimentary canal, liver lobes and reproductive system. 

 (Nerves, muscles and most appendages are omitted.) 



Fig. VII. — Posterior "maxilliped" (branch of the second maxilla); 

 same species. 



Fig. VIII. — Caudal plate ; same species. 



Fig. IX. — Caudal plate of S. Glansi, Haeckel. 



Fig. X. — -A swimming foot of S. Glausi from the fourth segment, 

 showing the two nearly equal branches. 



Fig. XL — A similar foot from S. Darwinii, Haeckel, showing how the 

 inner branch is here almost suppressed. 



Fig. XII. — The medium eye-spot in S. Darioinii, greatly magnified. 



Letteeing. — a. anterior antenna; c. corneal lens; d. chitinous cuticle; 

 /. fat sphere, secreted by the " Fat-body " ; g. central ganglionic 

 mass penetrated by the oesophagus (ce) ; h. branch of that peculiar 

 form of connective tissue know as the " Fat-body " ; i. intestine ; 

 k. stellate branches of the "Fat-body"; I. liver lobes lying 

 around the stomach; Is. crystalline cone ; m. muscles; me. median 

 unpaired eye; n. nerve; o. anus; ce. oesophagus ; p. pigment body 

 of the paired eyes; pa. posterior antenna; pcj. peripheral ganglion 

 cell with its sensory bristle ; r. spermatophore pouch ; s. vas 

 deferens ; st. stomach ; t. testis ; y. dermal gland ; yg. double-cell 

 consisting of a dermal gland and a ganglion cell ; x. problematical 

 organ (sensory?). 



(All figures after Haeckel.) 



