H. B. Kiek. — Ou the Anatomy of Sepioteuthis bilineata. 159 



Plate III. — continued, 

 m, prostate gland. 

 n, vesicula seminalis. 

 o, receptacle of spermatophores. 

 p, testis. 

 q, stomach. 

 r, pyloric coecum. 

 s, end of the gladius, exposed by tearing the membranous covering. 



Plate V. — Circulatory and Respiratory Organs. 

 Fig. 1. a, suspensory membrane of branchia. 



b, vena cava. 



c, descending aorta. 



d, intestine, cut and turned aside to show branching of vena cava. 

 e,e', left and right branches of vena cava, covered by renal organs. 



/, branchial heart. 

 /', appendage of branchial heart. 

 g, left lobe of renal organ. The opening is below ; the tip of the blow-tube is 



inserted in the opening of the right lobe. 

 h, ascending aorta, with arterial branches. 

 k, cut edge of membrane encasing branchial heart. 

 Fig. 2. Portion of a single branchial lamella, drawn with the camera lucida from the 



1 in. objective. 

 Fig. 3. Portion of the last, drawn with the camera lucida from the J in. objective, and 



showing the way in which the transverse capillary membranes of the lamellaa 



are folded. 



Plate VI. — Male Organs. 

 Fig. 1. Sketch of the male organs after the membranes holding the vesicula seminalis, 

 duct of the prostate, and whorls of the prostate, have been severed. 



a, penis. 



b, receptacle of spermatophores. 



c, duet of the prostate. 



d, prostate gland. 



e, vesicula seminalis. 

 /, vas deferens. 



g, testis. 

 Fig. 2. The prostate gland as in situ. The small figures, 1, 2, 3, 4, show the parts so 



numbered in fig. 1. 

 Fig. 3. A spermatophore, natural size. 

 Fig. 4. The same enlarged. 



Fig. 5. A portion of the same, drawn with the camera lucida from the 1 in. objective. 

 Fig. 6. Another portion. 

 Fig. 7. A close portion of a spiral coil from near the thin end of a spermatophore, 



showing a solid appearance. From the £ in. objective with the camera 



lucida. 



