3C' 



Charles GELDERD 



In our type they consist of ten tubes, or a pair of five tubes which 

 unité to form a common canal which opens at each side of tlie ventral 

 posterior surface of the pyloric chamber, fig. 14, 19, gl. 



Their mass occupies a great part of the thorax of the animal. 



The tubes run above and below the intestine in parallel Unes, fig. l. 



Three of the tubes run in pairs above the intestine; one pair runs at 

 the side and another ventrally below the intestine. 



The upper tubes ascend vertically from the common canal; passing in 

 a slightly oblique direction above the sexual glands at each side of the 

 dorsal vessel, they terminate at the beginning of the pericardium. 



The second pair rise also a short distance vertically, then run oblique- 

 ly on a level with the sexual glands, fig. i, il, 12. 



The third pair are situated just above the intestine, beneath the sexual 

 glands, the two tubes lying side by side. 



The third pair of dorsal tubes are very much longer than the other 

 dorsal tubes, running almost as far as the borders of the carapace. 



The fourth pair run at each side of the intestine but are shorter than 

 the third pair. 



The fifth or ventral pair descend from the common canal and place 

 themselves side by side below the intestine; they almost touch the nerve 

 cord on their ventral surface. 



The ventral pair are the longest, and terminate at the seventh 

 pereiopoda. 



The sécrétion from the digestive glands, arriving at the pyloric chamber 

 of the stomach by their common ducts can enter the intestine by ascending 

 behind the posterior surface of the médian pièce 53, or they can accumulate, 

 doubtless, in the inferior latéral pockcts. 



Thèse pockets are short paired coeca, extending a short distance be- 

 neath and at each side of the pyloric chamber, fig. 14, 17, p. l. i. 



Their opening lies quite close to the entrance of the digestive glands. 



Our préparations, however, prove that the sécrétions from the digest- 

 ive glands run especially in the grooves that are found on the latéral faces 

 of the médian pièce 5,, gr. 



Frey had only seen eight tubes in the digestive gland. 



The tubes are encircled with very fine striated muscular bands, sepa- 

 rated by short distances from one another. 



They are somewhat difficult to find; they hâve, however, been seen by 

 Frey and arc mentioned in Bronn's Klassen. 



