196 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 30 Sbr. 



one as in that species. This difference in size would, how- 

 ever, be of less importance were it not coupled with a 

 change in the form of the diverticle. Ude describes and 

 figures the diverticle of D. singularis as being transversely 

 oval with a short shaft. In the subspecies caroliniana the 

 diverticle is longitudinally oblong and the apex knob-like. 

 This was found to be constant in the three specimens 

 opened. 



Septal and Pharyngeal Glands. — The pharyngeal glands 

 are also developed ventrally, though they are here much 

 smaller than on the dorsal side. Dorsally they are long 

 and in cross-sections present a row of about seven glandular 

 masses attached to as many muscular strands. On the under 

 side of the pharynx, just above the ventral nerve-cord, 

 there is a row of narrow and short glands, also attached to 

 muscular strands, one following the other, just as on the 

 dorsal side. These ventral glands open into the ventral 

 part of the pharynx near its posterior margin. There are 

 also small septal glands close to the oesophagus in somites 

 VII and VIII. 



Prostates. — (fig. 142). The prostates are much larger 

 and of different form from those of D. singularis. Ude's 

 figure does not show the muscular duct, and his description 

 does not mention its relative size to the glandular part; but 

 the glandular part which he figures is certainly very much 

 narrower in proportion to its length than what we find in 

 the subspecies. In the former the glandular part is five or 

 six times the width of the duct. This glandular part was 

 the same shape and size in the three specimens examined 

 by me. In width it equals about one-third or more of the 

 body-cavity of the worm; it is scarcely folded, slightly 

 irregular and nipped, and extends through three or four 

 somites. The posterior prostates appear to be a trifle more 

 folded and extend backwards. Thus the prostates opening 

 in XVIII occupy XVI, XVII, XVIII and XIX, while those 

 opening in XX occupy XX and XXI and sometimes part of 

 XIX. Two figures are given of two prostates on one side 

 in the same specimen. 



