481 



Intestinal Canal. 

 (Magnified 30 diameters.) 



FIG I 



Ramdohr and Leydig are the only two naturalists, so far as I 

 know, who have published any original remarks on this subject. 



Ramdohr says, " Die Speiserohre kurz und enge. Der Magen 

 vorn ein wenig erweitert, lang und vollig durchsichtig, so dass man 



die dunkeln Contenta darin sieht Der Dunndarm ist leer, etwas 



weiter als der Magen, durchsichtig, bisweilen faltig. . . . Die Gallge- 

 f asse fehlen, wenigstens konnte ich nicht die geringste Spur davon 

 entdecken." This description, however, has reference to Chermes 

 Alni. 



According to Leydig (Zeitschr. f. Wiss. Zool. V. TAB. I. fig. 1), 

 the canal in Coccus hesperidum consists of a short oesophagus, a large 

 stomach, and a long intestine. Into this intestine open four glands. 

 Rather behind the middle of it are situated the two large, yellow 

 hepatic glands, and in front of these open, on one side, a free, slightly 

 curved caecum, and on the other, a shorter caecum coiled up and en- 

 closed in a pyriform sac, which is continued into a tube, whose end is 

 attached to the skin. This description is a singular mixture of truth 

 and error, and Professor Leydig is so careful an observer that it 



