THE NAUTILUS. 39 



pedition, they would possibly come under centervillmsis Tryon. 

 GoNiDEA ANGULATA Lea var, 



Chino Creek, near Ontario (R. H. Tremper, April, 1911). 

 The specimens are somewhat like a small form of G. a. harold- 

 iana Dall, but are more produced in front. 

 PisiDiuM ROPERi Sterki. 



Abundant in Dry Lake, north slope of San Gorgonio Moun- 

 tain, alt. 9050 feet (S. S. B., Aug., 1913). The specimens 

 were determined by Mr. Vanatta. Those from lower altitudes 

 previously reported as P. californicum Newcomb MS. are per- 

 haps the same. 



THE ANATOMY OF LEMIOX RIMOSUS (RAF.). 



BY A. E. ORTMANN. 



Lemiox rimosus (Rafinesque) 1831 = Micromya c^lata 

 (Conrad) 1834. See: Simpson, Synops. Nai., 1900, p. 525, 

 and Descr. Catal. Nai., 1914, p. 34. 



Lemiox rimosus Frierson, Nautilus, 28, 1914, p. 7. 



I collected this species at the following localities: Holston 

 River, Turley Mill, Grainger Co., and Mascot, Knox Co., 

 Tenn. ; North Fork Holston River, Hilton, Scott Co., Va., and 

 Rotherwood, Hawkins Co., Tenn.; Clinch River, St. Paul, 

 Wise Co., Va., and Clinton, Anderson Co., Tenn.; Powell 

 River, Combs, Claiborne Co., Tenn. At the latter locality, a 

 gravid female was found on Sept. 12, 1913 (with glochidia). 



Anal and supraanal openings separated by a moderately long 

 mantle connection, which is somewhat shorter than the anal, 

 and considerably shorter than the supraanal. Anal with fine 

 papillae, branchial with large papillae. Palpi with the posterior 

 margins connected at base only. Gills of the usual Lampsiline 

 structure; inner lamina of inner gills entirely connected with 

 abdominal sac, but often there is a short slit posteriorly (not 

 more than one-fourth of the length of the abdominal sac). 



Marsupium of the Lampsiline type, located in the posterior 

 section (less than one-half) of the outer gills, kidney -shaped; 



