66 STURGES. [VOL. I. 



break up finally just within the dermal musculature into 

 branches composed of delicate anastomosing fibrils ; these 

 branches do not disintegrate into separate fibrils whose endings 

 can be traced, but spread out, forming very delicate plexuses. 

 The ventral nerves were traced farthest, but all the others pass 

 finally to the body wall, and probably end in the same way. 

 The sensory papillae (Fig. 2) resemble those described by 



Blochmann and Bettendorff 17 as exist- 

 ing over the body and in the suckers 

 of Trematode cercaria. Each granular 



S C 



nervous bulb has, in the body papillae, 

 om a dense fibrillar core which terminates 

 m at the end of a small prominence at the 



FIG. 2. -Sensory papilla from the x Q f the papilla. The TCSt of the 



body, c , cuticle ; sc, sub-cutic- 



uia; cm, circular muscle ; /, bulb has often a fibrillar appearance, 



the granules being arranged in longi- 



tudinal rows, but in a few cases the fine granules are replaced 

 by a few large, deeply staining ones. From the inner end 

 of the bulb a fiber which looks like a continuation of the 

 fibrillar core passes down into the intermuscular reticulum, 

 and this fiber may, by careful focussing upon tangential sec- 

 tions of the body wall, be followed until, just outside of the 

 dermal muscles, it breaks up into delicate anastomosing fibrils 

 which resemble those into which the ventral nerves disinte- 

 grate. No cells, except in a few cases the giant-cells, were 

 found connected with the sensory papillae ; no sense-cells 

 like those figured by Blochmann and Bettendorff were 

 found. 



Small groups of large, deeply staining granules, like those 

 described in some of the sensory papillae, are scattered irregu- 

 larly in the subcuticula. The granules are solid-looking, and 

 those of a group usually lie close together in a straight line. 

 As they were first seen lying parallel to muscles, close to them, 

 and sometimes between the muscle fibrils, I thought for a time 

 that they might be traces of muscle nuclei, but I afterwards 

 found that they lie beneath the muscles and independent of 

 them. They may be a form of nerve-ending simpler than the 

 sensory papilla. 



