. Bulletin of the Department of Agriculture. Agriculture. NOSEMA-DISEASE. a slender tube traversing the entire thorax. In the anterior part of the abdomen the oesophagus expands into a large thin-walled sac which is known as the honey stomach (HS); next is the short neck- like portion, the proventriculus (Pvent); then comes the large U - shaped portion, the stomach or ventriculus (Vent), an organ with thick walls and many annular constrictions. Following the stomach is the short, narrow and coiled, small in- testine (SInt) having a circle of about one hundred long, greatly coiled, blind,
. Bulletin of the Department of Agriculture. Agriculture. NOSEMA-DISEASE. a slender tube traversing the entire thorax. In the anterior part of the abdomen the oesophagus expands into a large thin-walled sac which is known as the honey stomach (HS); next is the short neck- like portion, the proventriculus (Pvent); then comes the large U - shaped portion, the stomach or ventriculus (Vent), an organ with thick walls and many annular constrictions. Following the stomach is the short, narrow and coiled, small in- testine (SInt) having a circle of about one hundred long, greatly coiled, blind, thread- like tubes opening into its anterior end. These tubes are the Malpighian tubules (Mai). Following the small intestine is the large intestine or rec- tum (Red). When bees have been con- fined for some time this latter portion of the canal is found dis- tended' with material to be voided. Since the stomach is always invaded by the parasite in Nosema- disease, and the Mal- pighian tubules occa- sionally are, a further description of the structure of these or- gans seems warranted. The stomach (fig. 1, Vent) is a relatively thick-walled organ lying U-shaped within the abdomen. When removed and straight- ened it is seen to be in general cylindrical but somewhat spindle-shaped in form. (PL I.) Circular constrictions present give to it a segmented appearance. The number and distinctness of these transverse mark- ings vary somewhat. The size of the organ and its color vary also. The color varies within wide limits, being usually some shade of SInr \entj. Fig. 1.—Alimentary canal of worker bee: Pharynx (Phy), (Esophagus (.(E), honey stomach (HS), proventriculus (Pvent), stomach or ventriculus (Vent), small intestine (SInt), and large intestine or rectum (Red), rectal glands (RGl), Malpighian tubules (J/ai). Salivary glands of head (2GI) and thorax (SGI), and pharyngeal glands (1GI) are also shown. (Snodgrass.). Please note that these images are extracted from scanned page imag
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagriculture, bookyear
