150 MAKYET.S OF POND-T,TFE. 



in his "Evenings with the Microscope," appro^^iniates 

 to a figure of 8, from the constriction of the midrlle, 

 and other drawings have the same appearance. 



In Pritchard's book the canse of this discrepancy 

 is exphiined, and we are told tliat "the rotary 

 org;in is two-lobed when fully grown, being then 

 constricted in the middle," and that in a yonng 

 specimen the rotary organ is nearly circular. The 

 Limnias tube was opaque, from the adhesion of 

 foreign matter, and presented an untidy appearance, 

 strangely contrasting with the clear, neat bottles 

 of the Floscules. The length of the Limnias varies, 

 accordinof to Pritchard, from 1-20" to 1-40''. 

 Our specimen, when fullv extended and magnified 

 one hundred and eighty linear, looked about three 

 inches and a half lons^. and was therefore verv 

 small. Just below the ciliary lobes the gizzard is 

 seen, with its toothed hammers working one against 

 the other. The masticatory organ differs from the 

 typical form, as represented in the Brachion; and 

 Mr. Gosse observes that "each inirvs forms, with 

 its ramu>i^ a well-defined mass of muscle enclosing 

 the solid parts, and in form approaching the quad- 

 rature of a globe. Across the upper surface of the 

 mass the inicus is stretched like three long parallel 

 fingers, arched in their common direction, and im- 

 bedded in the muscular substances, their points just 

 reaching the opposing face of the ramus, and meeting 



