1907.] NATURAL SCIENCES OF PHILADELPHIA. 99 



are scattered rather irregularly over its dorsal and lateral surfaces. 

 On the trunk these glands accompany those of the preceding type, 

 and are confined principally to the areas occupied by the latter. Thus 

 on each trunk .segment, with the e.xception of the sixth, they also 

 occupy a narrow area just anterior to each ciliated l^and. Each of the 

 trunk segments, from the second to the fifth, inclusive, thus possesses a 

 glandular area which encircles it like a girdle, interrupted, however, 

 by the ventral strij) of cilia. In these areas the glands of the third 

 t}'pe are, together with those of the second, crowded so closeh^ that 

 sections through these regions appear as though honeycombed with 

 glands. In the areas of the sixth segment, previously described as 

 occupied by glands of the second type, those of the last type are also 

 present in such numbers that the hypodermis of these areas is filled 

 with closely crowded glands, as may be seen in fig. IS. At the lateral 

 margins of the ventral ciliated area, on each side, there is also an 

 irregular row of these glands, extending the length of the trunk. 



The form of the glands of this type is that of a short tube, consider- 

 al)ly bent or contorted, rounded at the base and tapering toward the 

 mouth. The contained secretion is granular, often exhibiting a re- 

 ticular structure, staining dark gray with iron-hsematoxylin, and un- 

 aff"ected b}' mucicarmine. A nucleus (71.) with a large plasmasome is 

 usually to be seen near the fundus; the protoplasm surrounding it, 

 however, is not clearly distinguishable from the secretion. These 

 glands are met with in various stages of activity, some of which are 

 illustrated in fig. 18. In contrast to those of the preceding type, 

 discharging glands are frequently met with, as may be seen in the figure 

 just mentioned. Those whose contents have been expelled, as in the 

 example represented in fig. 17, exhibit in the portion devoid of secretion 

 a black-staining residue which lines the walls and extends across from 

 side to side as a coarse network. 



Schmidt (1848) and Hallez (1879) describe rodlike bodies (battonets) 

 as occurring in the cytoplasm of Dinophilus. Nothing corresponding 

 to them exists in D. conklini unless it be the large mucous glands of the 

 second type, which are somewhat rodlike in form. Korschelt (1882) 

 found in D. apatris large glands on the ventral side and also on the 

 dorsum of the last segment; to these he ascribed the function of secret- 

 ing an adhesive fluid, and applied the name " Klcbsdriisen. " A group 

 of pyroform glands similar in function, but of greater length, were also 

 found by him on the caudal appendage; to these he gave the name 

 ' ' Spinndriisen, ' ' in allusion to the long threads of a mucus-like sub- 

 stance thrown out by them. Repiachoff (1886) studied the hypoder- 



