402 HAROLD HEATH, 



latter structures have been supposed by some authors to possess in 

 addition to a sensory function an adhesive character and are perhaps 

 instrumental in grasping food. In this species there are evidences of 

 a secretion surrounding each cirrus and of a nature not duplicated 

 elsewhere within the digestive tract but that it is adhesive in character 

 is not assured. On the other hand I have in my possession a species 

 of Neomenia from the Sandwich Islands that was preserved attached 

 to a polyp of EpizoanfJius or some nearly related genus. Its pro- 

 boscis was protruded through the body wall of the coelenterate and 

 the cirri were on the outside. If the cirri are instrumental in col- 

 lecting food it must be in connection with Diatoms, Foramiuifera or 

 organic debris upon which the Solenogastres feed at times. As the 

 matter stands there is no evidence whatever that the cirri are food 

 collectors. The fact that these filaments are protruded from the 

 mouth (at least in preserved specimens) and are composed of sensory 

 cells with a well developed nerve supply suggests that they may be 

 organs to determine the nature of the animal's food or the character 

 of its surroundings. 



Attention has been called to a low sensory ridge situated a short 

 distance within the mouth opening and external to the outer of the 

 large sensory ridges which it equals in length. It is chiefly composed 

 of slender colunmar cells slightly pigmented and nearly twice as high 

 as any of the neighboring epithelial cells. Throughout its entire ex- 

 tent it is underlaid by a rod-like mass of ganglion cells from which 

 numerous fibres are given otf to the sensory cells above it. On the 

 other hand other nerves pass ott' to the ganglionic network surrounding 

 the buccal mass. 



From the postero-lateral borders of the brain three nerves arise 

 on each side, the pedal, palliai and buccal connectives. For some 

 distance these course along close together within the visceral cavity. 

 More posteriorly each pcidal nerve gradually passes downward and 

 traversing the anterior pedal gland unites with the ventrally situated 

 elongated pedal ganglion. About the level of the hinder end of the 

 radula the first pedal commissure is situated. In calibre it is slightly 

 larger than the succeeding commissures yet all may be traced in 

 sections and dissections. In a very few cases a nerve has been traced 

 from the middle section of some of the pedal commissures into the 

 tissue of the foot. In the majority of cases this region is innervated 

 by nerves given otf on the inner side of the pedal cords. On the 

 outer side nerves arise that innervate the body musculature and 



