1888.] NATURAL SCIENCES OF PHILADELPHIA. 139 



the C. nanus, Kroyer, if it is not identical with it. It is 1-125 

 mm. long. The cephalothorax is about as wide as it is long 1*875 

 mm.; the first abdominal segment is obcordate 1*5 long and 1-25 

 wide ; and the second long and narrow 1-375 long and 0-375 wide. 

 The cephalic bothria 0*25 diameter. 



April 10. 

 Mr. UsELMA C. Smith, in the chair. 

 Nine persons present. 



April 17. 

 Mr. Thomas Meehan, Vice-President, in the chair. 

 Twenty-nine persons present. 

 The following papers were presented for publication : — 



" Distinctive Characters of Odontaspis littoralis. " By Joseph 

 Leidy, M. D. 



" Parasitic Crustacea. " By Joseph Leidy, M. D. 



Note on Eleonorite from Sevier Co., Arkansas. — Prof. George A. 

 KoENiG submitted his identification of Eleonorite. This species oc- 

 curs in cavities of Dufrenite and likewise intimately interlaminated 

 with it. It is of deep blood red color and gives a yellowish streak. 

 The habitus is prismatic columnar, the prisms showing strong vit- 

 reous lustre and pleochroism — light yellow, in one direction, deep 

 red brown in a direction at right angles. On the very scant mate- 

 rial at the author's disposal, no planes are sufficiently developed to 

 allow of an identification of the crystallographic characters. The 

 specific gravity was found = 2*949. The crystals can be heated in 

 a mattras to red heat without decrepitation, without change of color, 

 lustre and shape, while yielding a strong condensation of water. 

 Reactions for iron and phosphoric acids. The mineral is slowly 

 dissolved in nitric acid, rapidly in hydrochloric acid. The iron is 

 entirely /erric. The water is completely expelled at 250°C. Owing 

 to the scantiness of the material, the analysis was made with only 

 54 mg. of the mineral. 



This quantity yielded : water = 8 mg ; Mg^ P'' 0' = 26-3 mg. 

 Fe' O' = 26-8 mg.; AP O' = 2 mg. In percentage 



WO = 14-81 



P^O' ^ 30-93 



Fe^O' = 49-60 



APO' = 4-50 

 99-84 



