. Annali del Museo civico di storia naturale Giacomo Doria. Natural history. GADUSIA CHAPRA 11 importance. Thus no explanation can be given regarding the significance of caeca in the various groups of fishes. They seem to be merely auxiliary intestinal appendages that increase the general intestinal surface. In Gadusia chapra the lining of the buccal cavity and of the pharynx has delicate folds. The folds in the oesophagus are in the'form of longi-. an. Gadusia chapra (Ham.). J Fig, 2. Alimentary tract with uncoiled intestine. tudinally arranged rows of papillae. Gerhardt (1914) repo
. Annali del Museo civico di storia naturale Giacomo Doria. Natural history. GADUSIA CHAPRA 11 importance. Thus no explanation can be given regarding the significance of caeca in the various groups of fishes. They seem to be merely auxiliary intestinal appendages that increase the general intestinal surface. In Gadusia chapra the lining of the buccal cavity and of the pharynx has delicate folds. The folds in the oesophagus are in the'form of longi-. an. Gadusia chapra (Ham.). J Fig, 2. Alimentary tract with uncoiled intestine. tudinally arranged rows of papillae. Gerhardt (1914) reports on the oeso- phageal papillae of Ichthyococcus ovatus. The folds in the main portion of the stomach are very thick, few and are arranged length-wise, and in the pyloric portion a thick cuticle is present. The intestinal folds are transversely arranged and are ring-like and they continue into the py- loric caeca. The folds at the anal region are longitudinal and are of a zig-zag fashion (Fig. 3, a-f). The relative length of the gut is approxi- mately thelium; cut., cuticle; , floor of the buccal cavity; f. ph., floor of the pharynx; g.^ gill filaments; g. a., gill arch.; g. b., gall bladder; , gastric glands; , gastric gland cell; , gill raker; i., intestine; I., liver; I. j., lower jaw; , longitudinal layer of muscles; m., mucosa; , mucous cell; , mucosa of the pneumatic duct; mus.^ muscularis; n., nucleus; o., oesophagus; ph., pharj'nx; ph. p., pharyngeal pocket; , pneumatic duct; py-c.^ pyloric caeca; o., pyloric caeca orifice; r. bu. ca., roof of the buccal cavity; r. ph.^ roof of the pharynx; s. c. t., subserous connective tissue; , striated muscle fibres; ser., serosa; sm.^ submucosa; st. c, cardiac portion of stomach; st. ep., stratified epithelium; , pyloric portion of stomach; t., tongue; , taste bud; t. p., top-plate; t. pr,, tunica propria; u. j., upper jaw; ^ visceral cavitv ; ve. m., velar m
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