HELMINTHOLOGY HELM1NTHES THEM ATODES. 473 



pore transversiru elliptico, subdepresso ; acetabulo ori oppo- 

 site," which he found attached by the acetabulum to the 

 soft inferior surface of the abdomen of Carcinus moenas. 

 For the rest, Rathke does not believe that these animals are 

 properly placed, with the Trematoda ; as he has found 

 minute Amphipoda in their stomach, they do not conse- 

 quently draw their nourishment from the animals they 

 inhabit. 



According to Bellingham (Annals Nat. Hist, xiv, 1844, 

 p. 162), Pvntastomum [Pentastoma~\ tcenioides occurs also in 

 Ireland. 



Schornburg (Froriep's u. Not. Nr. 647, p. 136) has dis- 

 covered a trematode entozoon in the Leech, and named it 

 Heptastomum hirudinum. 



Valentin (Valentin's Repert. Bd. viii, p. 90) in examining, 

 in the month of August, thin sections of Frog's kidneys 

 under the compressorium, observed embryonic entozoa fur- 

 nished with a crown of cilia, such as also occur in the 

 urinary bladder of Frogs, as well as a larger Trematode with 

 an obvious acetabulum. 



According to Henle's observation (Zeitschrift fiir rationelJe 

 Medizin. 1. c. Bd. iii, p. 6), ciliary motions are evident in 

 many places in the lateral vessels of Cercaria echinata, the 

 anterior part of the bodies of which animals he observed to 

 be beset with minute spines. He also remarked in many 

 instances, in this Cercaria, larger and smaller spherical cor- 

 puscles, resembling the so-termed vitreous corpuscles of 

 the Cyst- worms, which frequently presented concentric striae, 

 and exhibited, as it were, a central opaque nucleus, and broke 

 under pressure. The Reporter is also acquainted with 

 similar corpuscles in several other Cercarise ; they are con- 

 tained in the excretory organs of these trematode-larvas, and 

 in Histrionella ephemera have been regarded by Ehrenberg 

 (Symbolse physicse) as ova. 



