1903.] NATURAL SCIENCES OF PHILADELPHIA. 385 



The stomach (Stom., figs. 20, 22, 25, 27, 28) is thiclc-waUed, with 

 large cubical cells bearing long ciHa ; this is the assimilative portion of 

 the intestine, and its cells are more or less filled with globules. Upon 

 it follows the posterior intestine (P. Int.), hned by a thin-walled, nucle- 

 ated epithelium without cilia. Here the faeces form large food balls 

 in ambigua, but not in the other species. By a short rectum (Rec), 

 often barely distinguishable from the posterior intestine, an opening 

 into the cloaca (CI.) is attained. The cloaca is ciliated apparently only 

 in coronetta (figs. 22, 23), is very thin-walled, and opens to the exterior 

 by the cloacal aperture placed dorsally at the junction of the trunk and 

 the foot, or a httle anterior to it. The diameter of the different por- 

 tions of the alimentary tract is dependent upon the amount of food 

 contained in them. 



One pair of stomach glands (Stom.GL, figs. 20, 22, 23, 25, 28) is pres- 

 ent in all the species, placed latero-ventrally at the boundary of 

 stomach and proventriculus. In coronetta (figs. 22, 23) and ambigua 

 (fig. 20) each gland is elongate with a single large nucleus, in conklini 

 (fig. 25) pyriform with several nuclei, in campanulata (fig. 28) of the 

 same shape but wuth one nucleus. The connection of these glands 

 with the stomach was determined positively only for ambigua, but there 

 can be doubt that they discharge into the stomach and not into the 

 proventriculus in the other forms also. 



A peculiar structure was found in every individual of ambigua, but 

 in none of the other species. This was a body of a brown color 

 (X.Y., fig. 20) placed in the posterior intestine, with a thick wall, a 

 deep-staining body (nucleus ?) in this wall, and rather vacuolar 

 contents. It appeared to lie within the posterior intestine. It can 

 hardly be a parasite, since exactly one of these bodies was found in 

 the same region in each individual. 



Musculature. — An exhaustive study of the musculature, such as was 

 given for Apsilus, was not attempted for Floscularia. Of the hypo- 

 dermal musculature (the following description applies particularly 

 to campanulata) a number of delicate transverse muscles are present 

 around the foot and trunk (fig. 27) ; by their contraction these portions 

 of the body are compressed, and the body fluid driven forward to 

 unfold the corona. In the corona this musculature is richly developed 

 (figs. 27, 28), though the separate muscles are fine. Two sphincter 

 muscles are present here, one close to the coronal margin and another 

 behind it. Numerous slender longitudinal muscles connect these to- 

 gether and with the hyopdermal thickening. The diaphragm has its 

 own sphincter, and receives branches of the lateral and ventral longi- 

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