On Prophysaon, etc. 295 



in Helix, from which we presume the marginals are quadrate, 

 not aculeate. Geomalacus, however, differs from PropJiy- 

 saon in having an extremely anterior mantle and orifice of 

 respiration close behind the right tentacle. It also has a 

 locomotive disk and caudal mucus pore. It is described 

 below, p. 309. 



Propbysston Heiiiithilli. u. s. 



From specimens preserved in alcohol we can draw the 

 following description only. Body blunt anteriorly, attenu- 

 ated posteriorly, rounded and high on the back. Mantle 

 granulated, whitish Avith a circular ring of smoke color 

 above the respiratory orifice. Body obliquely reticulated 

 with bluish Hues, the reticulations larger (about twelve) 

 below each side of the mantle, more numerous and smaller 

 on the posterior extremity of the body. These reticulations 

 are subdivided by irregularly disposed, rounded tuberosities, 

 with colorless interstices. Above the foot, from the longitu- 

 dinal line running around the animal to the edge of the foot, 

 are perpendicular lines or furrows, also bluish in color. The 

 foot has crowded wrinkles, running obliquely backwards 

 from its centre to its margins. Length of an alcoholic speci- 

 men 40 mill. 



Astoria, Oregon : Oakland and Mendocino Co., Califor- 

 nia (Mr. Henry Hemphill). 



The internal shell (pi. xiii, fig. 2) differs in thickness, but 

 is always well marked, sometimes suboval, sometimes sub- 

 hexagonal, always longer than wide. 



The jaw and lingual membrane have been described above. 



The genitalia* are figured on pi. xiii, fig. 6. The testicle is composed 

 of black aciniform coeca; it is almost completely buried in the upper lobes 

 of the liver, the epididymis completely so, lying on the floor of the cavity 

 formed by the spiral winding of the upper lobes. It appears to pass 

 through one of the lower lobes to join the oviduct, before reaching 

 which it is greatly convoluted. The accessory gland of the epididymis 

 appears to be composed of several aciniform coeca of unequal size. The 



*I alone am responsible for the descriptions of the anatomy.— W. G. B. 



