Two New Trcinatodes of the Family Gyroclactylicla?. 3 



that of the connective 23,«, that of the marginal hooks 42-72/4, 

 irrespective of the size difference of the individual worms. 

 Wegener's ventral unpaired piece is absent in this species. The 

 normal position of the central hooks appears to be such that their 

 sharp points are directed dorsally, as is stated also to be the case 

 in the species studied by Wegener [p. 221]. 



Of the dermal glands, two pairs open at the front end of the 

 body and two on the caudal disk. Of the two pairs of the anterior 

 or cephalic glands, the inner consist each of two or more very large 

 cells near the median line of the body, more on the dorsal side; 

 the comparatively long ducts open at the top of the inner pair of 

 the papilliform processes already mentioned, close to the median 

 line and on the ventral side. The ducts of these unicellular 

 glands are sometimes empty, but at other times they contain a 

 finely granular secretion similar to but usually less well stained 

 than that of the outer glands to be directly described. These 

 inner pair of glands lie as a whole in front of the pharynx, and the 

 cells lie so close together in the median line of the body that the 

 ducts alone are separated to form a pair (fig. 1). The cells of the 

 outer cephalic glands are situated in two groups on the ventral side, 

 embeded in the parenchyma close to the dermal muscular system 

 on either side of the posterior part of the pharynx, wedged in 

 between the front end of the vitellarium and the pharynx and 

 salivary glands. The cells are naturally of various sizes according 

 to the stages of their secretory activity, but they are very large, 

 measuring in cross sections of the body 10« or more in diameter 

 when the cytoplasm is completely filled with a finely granular 

 secretion, and they are then more or less pyriform; but the 

 smaller cells are more or less polygonal owing to mutual pressure. 

 In double staining with haematoxylin and orange, the secretion 

 takes up only the latter, and therefore the larger cells are all 

 stained yellow, while the smaller ones are more or less blue 

 stained according to the stage of their secretory activity. The 

 number of the gland cells in each group is about one dozen. 

 Their nuclei are vesicular and have but little affinity for haema- 

 .toxylin; sometimes the chromatin forms a single conspicuous 



