204 



W. HAROLD LEIGH-SHARPE 



any siphon I have as yet investigated; 4) it appears to have a 

 homologue in Callorhynchus which is merely a folded portion of 

 the clasper-tube. 



Lying within this cavity is an elongated longitudinal body 

 which is neither solid nor tubular, but rolled upon itself in a 

 scroll-like manner (fig. 4, L. B.). A microscopic examination 

 of this body in transverse section reveals (fig. 5) that it is com- 



Gr. n 



Fig. 4 Chimaera monstrosa. Gr., grappler, the pouch having been dissected 

 away; M., muscle; Cav., cavity; L. B., longitudinal body; Ex. R. and Int. R., the 

 external and internal radii of the posterior clasper. 



posed of compact bands of striped muscle, some spongj^ tissue, a 

 supporting base of cartilage, and covered by a most curious 

 epithelium. This epithelium consists of a single layer of ex- 

 tremely long, narrow, rod-hke cells, with a nucleus in the centre 

 where there is a sUght dilatation to receive it. Such cells are 

 always associated with a sensorj'- epithelium, (e.g., olfactory) in 

 higher types, and are probably not glandular. 



