BLOOD-VASCULAK SYSTEM, ETC., OF AMIURUS CATUS. 457 



PLATE VIII. 



Figs. 2, i, 5, 6, 9, 11, 12, Hartnack Ob. 8, Oc. 2, mm. luc. Figs. 4, S, 

 06. 4. Fig. 10, Ob. 2. 



Fig. 1. — I., II., III., IV., 1st, 2nd, 3rd and 4th branchial veins; c. ex., ex- 

 ternal carotid; c. in., internal carotid; ps., pseudobranchia ; n., 

 branch of internal carotid to the nasal cavity ; br. c, cut edge of 

 the floor of brain case removed to show {ant., med., post.) anterior, 

 median and posterior arteries to brain ; sc, artery to pharynx, 

 &c. ; ao. des., aorta descendens ; h. k., artery to head-kidney ; 

 c. m., coeliaco-mesenteric. 



FlG. 2. — Pseudobranchia — a., part of wall of internal carotid ; b., openings 

 into the surrounding tissue ; c, artery. 



Fig. 3. — From the same section — a., arteries ; b., spaces from which they 



arise ; c. , blood-cells in interfibrillar spaces. 

 Fig. 4. — From a section of spleen of young fish — c, capsule ; m. c, Malpi- 



ghian corpuscle, with m. a. its artery ; pg., pigment granules ; p., 



pulp. 

 Fig. 5. — Same as the last — a., artery ; x., spaces between artery and tissue 



of Malpighian corpuscle, m. ; p., pulp ; v. s., venous sinuses of 



pulp ; g., pigment granules. 

 Fig. 6. — Malp. corp. from spleen of old fish — a., arteries ; i., interconnec- 



tive tissue of M. corpuscles, with blood-cells in its interspaces. 

 Fig. 7. — Cells of spleen from Midler's fluid prep. — a., adenoid connective 



tive tissue cells ; b., pigment cells with granules ; c, blood-cells ; 



d., lymphoid cells of Malp. corpuscles. 

 Fig. S. — From section of thyroid gland — tr. is placed in lumen of truncus 



arteriosus, cut at the origin of the stem of the 3rd and 4th pairs 



of branchial arteries ; v., veins ; vc, vesicle with granular con- 



tents ; vc, vesicle filled with colloid matter ; p., pigment. 



Fig. 9. — From section' of head-kidney to show the pulp tissue and the 

 venous sinuses. 



Fig. 10. — Section of s.r., suprarenal body imbedded in the substance of the 

 kidney, k. 



Fig. 11. — Lobules of suprarenal body — A. to show the common form and 

 arrangement of the nucleated granular cells ; B. lobules with in- 

 distinct cellular outlines, but distinct nuclei, and deeply stained 

 structures (figured black) usually pointed triangular, supposed to 

 be ganglion cells. 



Fig. 12. — Cells of lobule, Midler's fluid prep. 



