LOPHOMENIA SPIRALIS. 129 



resented (Plate 6, fig. 5). The hypodermal cells bounding the cavity are higher 

 and more slender than the usual type and are richly ciliated. All contain spindle- 

 shaped nuclei and lightly staining cytoplasm. Immediately behind the outlet 

 of the anterior pedal gland the foot arises and extends to the opening of the 

 cloaca. At the outset it is well developed but gradually decreases in size posteri- 

 orly until near the cloaca when it enlarges to twice its average size. A short 

 distance behind its front end the hypodermal cells lateral to the base cease to 

 develop spines and assume the form of a ridge (Plate 19, fig. 3) that increasing 

 slightly in size continues to the cloaca where each like the foot enlarges somewhat 

 before disappearing. At all points the cavity of the foot is very small, never 

 spacious enough to permit the entrance of blood corpuscles. 



The relations of the anterior section of the digestive tract are shown (Plate 

 6, fig. 5). Here the pharynx is somewhat protruded, but it is evident that the 

 structures borne on the buccal wall are not unlike those of the other Neomeniina 

 hitherto described. Immediately within the lips the usual ciliated atrial ridge 

 is present. However it is relatively short, its contained blood sinuses small 

 and the component cells low and very slightly pigmented. This is also true 

 of the inner elevation with the exception that in both specimens it is of somewhat 

 greater height. The cirri of the included area are relatively slender and are 

 usually attached separately to the buccal wall. Their cavities are of extremely 

 small calibre and it is only in exceptional cases that the contained nerve fibre 

 may be determined. Also their cell boundaries are indistinct, but otherwise 

 these organs are not unlike those in Proneomenia hawaiiensis. 



The pharynx consists of two distinct portions, the first a relatively slender 

 tube leading from the mouth into the second enlarged section that opens in 

 turn into the stomach-intestine. Throughout the epithelial Uning consists 

 of columnar cells, forming at first low longitudinal ridges that gradually increase 

 in height attaining their maximum size at the opening into the stomach. 



At the junction of the first and second sections the pharynx is produced 

 into a much folded diverticulum that affords an outlet for the dorsal salivary 

 gland (Plate 6, fig. 5). This last named organ is relatively very voluminous, 

 larger in fact than in most species of Solenogastres hitherto described. With 

 the exception of two narrow lateral areas held by the anterior pedal gland it 

 occupies the dorsal surface of the digestive tract, and to a much less extent, the 

 lateral borders between the brain and stomach-intestine. In the most favorable 

 sections the component cells are clearly pyriform and are connected by a narrow 

 duct filled with granules that leads to the pharynx. Some of the smaller cells 



