THE NAUTILUS. 67 



AMYGDALONAJAS DONACIFORMIS (Lea) (Plagiola d. Simpson, 

 1900, p. 605). 



One male and one gravid female, with glochidia, from 

 Wabash River, New Harmony, Posey Co., Ind., collected by 

 A. A. Hinkley, Aug. 8, 1912. 



Soft parts agreeing with those of A. elegans (Lea), as 

 described previously (Ortmann, 1. c. p. 328). The posterior 

 margins of the palpi are connected for about one-fourth of 

 their length. Inner lamina of inner gills in both specimens 

 connected with abdominal sac, leaving only a small hole open 

 at posterior end of foot. Marsupium of the female formed 

 by 25-30 ovisacs. Glochidia extremely small, subovate, agree- 

 ing in shape with those of A. elegans, but even a little smaller. 

 Length 0.05, height 0.06 (in elegans they are said to be 

 0.075 X 0-09 mm.). These are the smallest glochidia known 

 to me. 



PROPTERA CAPAX (Green) (See: Lampsttis c. Simpson, 1900, 

 p. 529). 



I have males and females of this species from Wabash 

 River, New Harmony, Posey Co., Ind., collected by A. A. 

 Hinkley, Aug. 8, and from the Mississippi River, Martins 

 Landing, Rock Island Co., 111., collected by Dr. Coker, October 

 5, 1912. 



Coker and Surber (Biol. Bull. 20, 1911, p. 179, pi. 1, f. 4) 

 have first discovered that this species has the glochidia of 

 Proptera. Among both of my sets are gravid females with 

 glochidia, and I have been able to confirm this, and to study 

 the rest of the anatomy. 



Mantle connection between anal and supraanal rather long, 

 slightly longer than the anal, the latter crenulated ; branchial 

 with papillae. In the female, the inner edge of the mantle 

 in front of the branchial is slightly lamellar, with few remote, 

 fine crenulations, which resemble minute papillae posteriorly 

 (near the branchial) ; but these "papillae" are in propor- 

 tion to the size of the animal extremely small, much smaller 

 than in the genus Eurynia; the lamellar edge is nowhere 

 flap-like, as in Lampsilis, and runs forward about one-third 



