June 10, 1910] 



SCIENCE 



917 



3. None of the circles of the F and F' groups 

 pass through either of the fixed points F and F'. 



Any circles drawn through F and F' are ex- 

 traneous to the loci, but each such circle is 

 orthogonal to every circle in the loci groups. 



'Notes on Fungi: F. L. Stevens and J. G. Hall, 

 North Carolina Agricultural Experiment Sta- 

 tion, West Raleigh, N. C. 



Three new species of CloAiiceps were described. 

 Two of them are upon Paspalum and are thought 

 to be the perfect stages of the fungus usually 

 known as Sclerotium Paspali S. Germination of 

 the sclerotium was described and the characters 

 of the fungus were illustrated by photographs 

 and specimens. The third species grows upon 

 gama grass (Tripsacum dactyloides L.). Both 

 sphacelia and ascosporic stages were exliibited. 

 Technical descriptions were given under the 

 names Claviceps Paspali (S.) n. comb.; G. Rolf six 

 n. sp., and G. Tripsaci n. sp. These will be pub- 

 lished in full elsewhere soon. 



Specimens of a Gercospwa upon persimmon 

 which was thought to be new were also shown. 



Some Methods of Making Illustrations: Z. P. 



Metoalf, Department of Agriculture, Raleigh, 



N. C. 



A brief consideration of some of the more 

 important methods of making illustrations con- 

 sidered from the standpoint of the biologist. 



Precautions Necessary in Estimating Glimates of 

 Geological Time: Collier Cobb, University of 

 North Carolina, Chapel Hill, N. C. 



The Jaws of the Spotted Sting Ray Aetobatus 



narinari: E. W. Gudger, State Normal College, 



Greensboro, N. C. 



This ray and its jaws were described by George 

 Marcgrave from a specimen from Brazilian waters 

 in a book published in 1648. Unlike other pave- 

 ment-toothed rays, this fish has only the central 

 row of teeth, the lateral ones having entirely dis- 

 appeared. Marcgrave correctly counted its four- 

 teen I-shaped upper teeth, and its seventeen broad 

 V-shaped lower ones. The lower jaw is narrower 

 and longer than the upper and projects beyond 

 the lips. With it and the snout the ray digs up 

 the clams which constitute its chief food. 



The paper was illustrated with photographs of 

 the fish and with a pair of dried jaws. 



The writer has in preparation for the U. S. 

 Bureau of Fisheries, a paper on this ray, review- 

 ing all the work ever done on it, and including 

 hi3 own observations and photographs. 



The Cocoanut Grab: John F. Lanneau. 



Called also the robber crab and the pouch crab. 

 Shaped more like a lobster than a crab. Found 

 on islands of the South Pacific. Weight usually 

 five or six pounds, sometimes twenty. Feeds on 

 fallen cocoanuts. Said to climb the trees. Is 

 highly esteemed as food, especially the rich, fatty 

 content of the pouch. Is found on our island of 

 Guam. It and other singular forms of life on 

 that pleasa,nt little island would repay a biolo- 

 gist's investigation. His visit would likely be 

 facilitated by our Secretary of War or Secretary 

 of Navy. 

 A Double Flowering Dogwood: F. L. Stevens 



and J. G. Hall, North Carolina Agricultural 



Experiment Station, West Raleigh, N. C. 



A case of double flower of the common flower- 

 ing dogwood (Gornus florida L.) due to the ex- 

 cessive development of the small bracts that sub- 

 tend the individual flowers of the ordinary head 

 was reported. There was as well the suppression 

 of all the individual flowers except the central 

 one, which appeared entirely normal. 

 A Note in the Development of the Oall-fly Dia- 



strophus nebulosus 0. S.: J. D. Ives, Wake 



Forest College, Wake Forest, N. C. 



This paper is published in full in the current 

 number of the Journal of the EUsha Mitchell 

 Soientifio Society. 

 Pecan Gulture im North GaroUna: W. N. HuTT, 



State Horticulturist, Raleigh, N. C. 



E. W. Gudqer, 



Secretary 



SOGIETIES AND AGADEMIES 



THE SOCIETY FOB EXPERIMENTAL BIOLOGT AND 

 MEDICINE 



The thirty-ninth meeting was held at the Shef- 

 field Biological Laboratory, New Haven, Conn., 

 on Wednesday, May 18, 1910, at 4:15 P.M., with 

 President Morgan in the chair. An executive 

 meeting was held. 



New members elected: A. B. Eisenbrey, H. D. 

 Senior, Edna Steinhardt, H. F. Swift. 



Members present: Atkinson, Beebe, Davenport, 

 Gies, Harrison, Henderson, Janeway, Lee, Levin, 

 I., Lusk, MacCallum, Meltzer, Mendel, Morgan, 

 Murlin, Norris, Pearce, Shaklee, Stewart, H. A., 

 Wolf. 



Scientific Program 



" An Examination of Frohlich's Theory of the 

 Treppe," Frederic S. Lee and E. N. Harvey. 



