450 JOURNAL OF THE WASHINGTON ACADEMY OF SCIENCES VOL. 22, NO. 12 



The three caudal glands, 15, 38, and their three ducts, as at 40, are shown 

 more clearly when stained, as in the male specimen figured. 



Habitat: Stagnant marine mud, below low tide, often where there is a slight 

 overgrowth of eelgrass; harbor at Woods Hole, Massachusetts, U. S. A. at 

 all seasons. It also occurs in the Mediterranean Sea, near Naples, Italy. 

 This species is subject to autumnal (?) attacks of fungi and bacteria. The 

 resulting diseases are of a very interesting character, and sometimes give rise 

 to necrosis of the posterior part of the body. One of the common assailant 

 cyanophytes(?) gives rise to an extensive aigrette-like appearance. 



Examination of the living specimens may very profitably be supplemented 

 by examination of temporary mounts in lactophenol, 5 per cent solution of 

 potassium hydrate, and (broken open) in acetic acid-methylene green, as well 

 as "intra-vitam" in seawater-methyl blue. 



