Nos. IAND2.] COTYLASPIS INSIGNIS. 15 



toward the surface where it penetrates the cuticle to open to the 

 outside, as in Fig. 13. The exact relation of the outer end 

 of the cell and the cuticle I have not yet made out. The cell con- 

 tains a finely granular material with no affinity for the haematoxylin 

 stains, but tinging faintly with orange G. Each cell has a distinct 

 nucleus, which is located on the margin of the cell in the deeper 

 portion (Fig. 14). It is not compressed there as in many gland 

 cells. In some instances fibers of the parenchyma muscles are in 

 such relation with these cells as to suggest that the}' may, by con- 

 traction, discharge those cells. 



h. The Alimentary System. 



This is shown in Figs. 3-8, 15, 16, 17 and 18. It is not essen- 

 tially different from that of the rest of the members of the family. 

 The mouth, only slightly in front of the pharynx, projects into the 

 mouth-funnel at its base. It is very distensible and is controlled 

 by circular and dilator fibers (Fig. 15). There is a slight indi- 

 cation of a pre-pharynx. The pharynx has a flattened egg 

 shape, its vertical diameter slightly exceeding the transverse. 

 It is lined with a continuation of the outer cuticle, and com- 

 posed of muscular fibers bound into a mass like that of the 

 ventral sucker, and marked ofit' from the parench}-ma by a limit- 

 ing membrane. It is crossed by branched muscle fibers, and on its 

 surface are fibers running lengthwise and crosswise. It contains 

 cells which resemble the parenchyma gland cells in appearance. 

 There are long protractor fibers attached to its hinder end, which 

 run forward through the parenchyma and are attached to the 

 body-wall. Distinct retractor fibers were not seen, but indications 

 of them are present. 



The oesophagus is short and broad. Its wall consists of mus- 

 cular fibers, and lying directly on these a layer of cuticle 

 directly continuous with that of the pharynx. Internally this 

 layer abuts directly against the epithelium of the intestine (Figs. 

 3, 6, 16). In view of the observations of Pratt '98 upon the 

 cuticle of the appendix of Apoblciiia, where this layer passes under- 

 neath the epithelium, I have made a careful study of my sections 

 at this point to determine if a similar relation exists here, but none 

 of mv sections will bear such an interpretation. I have also 



