OECELLA. 379 



ramify. The fibrous capsule also sends outwards to the medullary substance strong 

 fibrous bands, which unite with similar bands derived from the hilus. The cortical 

 substance is about a quarter of an inch in thickness, and is of looser texture around 

 its capsular than its medullary border which is fibrous in texture ; the fibrous bands 

 generally indicating the presence of arterial twigs proyided with enormously thick 

 coats. The gland is attached all along its under surface to either side of the 

 inferior division of the coronary artery and vein, whUe its base, directed upwards, 

 is attached along the superior branch of that artery which it invests. At the 

 beginning of the inferior division of the coronary artery two branches are given off 

 for the supply of the gland, one passing into the inferior fifth of the gland, as a 

 distinct branch, whilst the other, proceeding from the opposite side of the vessel, 

 runs right through the base of the gland, viz., parallel to the superior coronary 

 artery and in front of and above the superior coronary vein, and inosculating with 

 the superior coronary artery after it issues from the gland. These vessels, artery 

 and vein, are embraced in the fixm fibrous capsule, except below the vein where the 

 fibrous character is lost. 



As to the intimate structure of the above mentioned stomach gland, I have 

 given its naked-eye appearance when sliced through in fig. 7, PI. XXVII. 

 Beneath its strong fibroid capsule, is firmish gland-like substance (g.) pierced 

 here and there by thick-walled blood-vessels (a.) of an arterial character, and wide, 

 irregular, elliptical, or irregularly contoured venous channels (ti.).^ In one part of 

 it there is a much iirmer, tougher, almost tendinous-like mass {t.) and much less 

 porous than the neighbouring tissue. The glandular substance itself in all essen- 

 tials agrees with an ordinary lymphatic gland, with moreover a feature peculiarly 

 its own, viz., an enormous number of good-sized, even large, vascular channels, 

 besides a plentiful supply of tributary capillaries. See fig. 3, PI. XXXVII, and 

 also compare figs. 4 and 5 in same plate, being sections of a somewhat similar 

 gland in the lung of Flatanista and Orcella. Thin and partially transparent sec- 

 tions of these glands made in a variety of directions and examined under low 

 and high microscopic powers show everywhere a vast number of capacious blood- 

 channels. These are by no means regular in calibre or direction, but branch hither 

 and thither, and from them also proceed branches and branchlets of very irregular 

 character. Very fine twigs seem to pass direct to those of larger calibre, and 

 veins and arteries seem mingled promiscuously. This vascular plexus has not 

 then the character of what is understood by rete mirabile, where the vessels maintain 

 a nearly uniform calibre and run close together in parallel hues ; but, on the contrary, 

 it has a want of uniformity. Some of their walls are thin, as if alone bounded 

 by a cellular layer ; others are much thicker walled. Encompassing these vessels 

 in every direction, and indeed simply allowing them to permeate it, is a trabecular 

 frame-work of variable degrees of thickness and fineness and the meshes of which 

 are of all sizes and shapes, though, where the intermediate more pulpy substance 

 has been pressed out, the reticulation has a somewhat stellate configuration. This 

 last is due to more condensed enlarged portions of the membrane giving off radii 



