CAMPYDORA 307 



XIII. Order Anaxonchia 



.6 12.2 33. "56 85. 



88. Campydora demonstrans 

 Eight longitudinal striations exist throughout the length of the body. In cer- 

 tain parts, especially along the neck, the longitudinal striae are more marked 

 than elsewhere, attaining almost the magnitude of wings. There appear to be 

 four such "wings," but an exact count has not yet been made. Neck conoid. 

 There are six rounded, somewhat flat, partly confluent lips, bearing two circlets 

 of labial papillae, as shown in the illustration. These are plainly innervated, 

 and are of the sort commonly seen in Dorylaimus. The inner circlet has six 

 members; the outer circlet twelve, i.e., six pairs. The six slender structures 

 extending forward around the mouth, the inner circlet, may also end in organs 

 having the nature of papillae, but if so, they are of a different character 

 from the outer papillae. Base of the solid onchium axial, m 

 or nearly so, the apex however, bent considerably to the dorsal 

 side. The onchium may be protruded by means of longitudi- 

 nal muscles composing the pharyngeal bulb. Lining of the 

 posterior portion of the pharynx considerably less refractive. 

 The oesophagus has about the same relative diameter until it 

 finally expands suddenly to form the somewhat elongated, msc 

 cylindroid cardiac bulb, which is fully five-sixths as wide as 

 the corresponding portion of the neck, and contains a rather 

 faint, elongated, three-parted valve occupying about half XTSO 

 the optical longitudinal section. This cardiac bulb has a peculiar formation in 

 that the valve extends very nearly from end to end of the bulb and is manifestly 

 triquetrous, so that by the contraction of the radial muscles, the bulb can be 

 thrown into the form of a chamber. Lining of the oesophagus unusually distinct. 

 The central oesophageal tube, when seen in optical section presents each of its 

 walls with a double contour, and the lumen has about the same width as the 

 thickness of the walls. The entire width of this tube is considerably greater 

 than the thickness of the cuticle, and is about equal to 'one- twelfth the diam- 

 eter of the middle of the neck. The intestine becomes at once about five-sixths 

 as wide as the body. There is a comparatively distinct, broad, low cardia. 

 The walls of the intestine are comparatively thick. Its cross-section would 

 probably present two to four cells. These cells contain doubly-refractive, 

 spherical, scattered granules of variable size, the largest of which have a diam- 

 eter one-tenth as great as that of the body, the smallest being very much smaller. 

 When seen with crossed Nicols, these granules show a prominent St. Andrew's 

 cross. All the granules appear to be of the same character; their walls, seen in 

 optical section, present a double contour. Behind the base of the neck for 

 a distance about equal to one body-diameter, the granules are few in number 

 and small in size. Elsewhere, they are about equally distributed, or perhaps a 

 little less abundant toward the posterior end. The tail is conoid from near 

 the anus, and the cuticle becomes thicker on the posterior extremity and more 

 strongly striated. In young specimens it expands laterally to form wings, 

 which appear quite distinctly striated when viewed dorso-ventrally. From 

 the conspicuous, depressed anus, the strongly refractive, cutinized rectum 

 is considerably longer than the anal body-diameter. Excretory pore depressed 

 and rather conspicuous. From it, the cutinized duct can be distinctly seen 

 leading inward. From the depressed somewhat circular vulva, the cutinized 



