136 Zoology 



MAST, S. O. Behavior of the Loggerhead Turtle in Depositing its Eggs. 5 pages. 

 HOOKER, DAVENPORT. Certain Reactions to Color in the Young Loggerhead Turtle. 



8 pages, 2 plates, i text fig. 

 STROMSTEN, FKANK A. A Contribution to the Anatomy and Development of the 



Posterior Lymph Hearts of the Turtle. 11 pages, 2 plates, 5 figs. 

 HARTMEYER, R. Polycitor (Endistoma) mayeri nov. sp., from the Tortugas. 5 



pages, i plate. 

 COWLES, R. P. Reaction to Light and other points in the Behavior of the Starfish. 



1 6 pages, 6 figs. 

 TENNENT, D. H., and V. H. KEILLER. The Anatomy of Pentaceros reticulatus. 6 



pages, 3 plates, 2 figs. 

 TENNENT, D. H. Echino'derm Hybridization. 33 pages, 6 plates, 7 figs. 



Mayer states that, whatever effect the cations sodium, magnesium, potassium, 

 calcium, ammonium, hydrogen, or CO2 may have upon neuro-muscular movements 

 their effects upon the movements of cilia are the exact opposite. 



Harvey shows that it is probable that in the Scyphomedusa Cassiopea the 

 origination of stimuli in the nerve-organs is dependent upon the progressing of 

 some chemical reaction. He finds also that nerve conduction exhibits a falling off 

 in rate with rise of temperature similar to that observed in enzyme action, and he 

 is led to conclude that the propagation of the nerve impulse is not only dependent 

 upon the velocity of a chemical reaction, but that the reaction is still further accel- 

 erated by the presence of an enzyme. 



Stockard shows that regenerating tissue possesses an excessive capacity for 

 the absorption of nutriment, which it obtains at the expense of the old body-tissues, 

 causing them to decrease in size as does the growth of a rapidly growing tumor. 

 The rate of regeneration is independent of the extent of injury and either remains 

 constant or decreases with greater injury. 



Hargitt describes an actinian Cradactis variabilis, which is believed to be new 

 to science and which lives in the crevices of the coral reefs. 



McClendon shows that a Pontoniid, Typton tortuga, displays a convergence in 

 structure and habits with Alpheus and lives with the latter in the cavities of logger- 

 head sponges. Both forms are thigmotactic and prefer to remain in glass tubes 

 rather than in an open aquarium. He also describes the habits of the sea-anemone 

 Cradactis variabilis Hargitt, which can detach its base from the rocks and move 

 about upon the tips of its tentades. 



Mast gives a detailed description of the behavior of the loggerhead turtle in 

 scooping out the sand and depositing its eggs in the nest thus formed. 



Hooker finds that the newly hatched loggerhead turtles are strongly attracted 

 by the blue of the sea or of the sky above the sea, and thus under normal condi- 

 tions move away from the green bushes and go straight toward the ocean. 



Stromsten shows that in the embryo of the loggerhead turtle the mesenchymal 

 spaces capture certain capillaries and convert them into the anlagen of the posterior 

 lymph hearts. 



Hartmeyer describes a new species of ascidian, Polycitor (Eudistoma) mayeri, 

 from the Tortugas. 



Cowles finds that the starfish Echinaster crassispina usually moves from dimly 

 to brightly lighted regions independent of the direction or color of the light rays. 

 At temperatures lower than 17.8 or higher than 34.4 C. it ceases to move. It 

 perceives light not only by means of the eye spots at the tips of the arms, but a 

 large part of the aboral surface is sensitive to light; and in Pentaceros the tube- 

 feet and gills react definitely to changes in intensity of light. 



Tennent and Keiller give a description of the anatomy of the giant starfish 

 Pentaceros reticulatus and find that there are two contractile intestinal caeca in 

 each arm. 



Tennent reviews the whole history of the study of Echinoderm hybridization, 

 describes many new experiments oi his own, and gives a detailed account of the 

 results of his research wherein in reciprocal crosses between Hippone and Tox- 

 opneustes he finds that in ordinary or in alkaline sea-water Hipponoe is dominant, 

 while in sea-water to which a slight amount of acetic or hydrochloric acid has been 

 added Toxopneustes becomes dominant. 



