Febkuaby 13, 1903] 



SCIENCE. 



251 



fected this whole group. Comparing the 

 two sexes of the primitive form of 

 Graellsia with their hind wings briefly 

 tailed, the males have nmch the longer 

 'tails.' In Actius selene the tails are 

 nearly of the same length in both sexes, 

 but in Tropa'a luna, perhaps the most re- 

 cent form of the group, the tails in the 

 male are decidedly longer than in the other 

 sex. In T. artemis of Japan there is a 

 tendency to revert to the Graellsia form of 

 tail, as thej' are very short. The prin- 

 ciple is seen also in regard to the mark- 

 ings and coloration in general. 



From the prepotency of the male of some 

 ancestral form similar to this insect, the 

 tailed forms of the large green moths 

 living in Africa, Asia, and our American 

 Tropcca luna may have originated. 



Other striking examples of androrhopy 

 are seen in the moths of an allied group 

 (Sphingicampidte), such as Arsenura, Eu- 

 delia, etc. This does not conflict with the 

 apparent fact that the length of the tails 

 of species of Papilio seems to depend on 

 temperature, those living in boreal, cool, 

 moist situations, or in cool, damp, elevated, 

 mountainous regions, having the tails much 

 shortened. 



The Decapod Crustaceans of the North- 

 west Coast of America from Alaska to 

 San Diego, California: Mary J. Eath- 

 BUN, United States National Museum, 

 Washington, D. C. 



This paper, which will be published 

 among the results of the Harriman Ex- 

 pedition, embraces not only the material 

 derived from that expedition, but the col- 

 lections in the U. S. National Museum 

 which have been obtained in the same 

 region from the work of the U. S. Fish 

 Commission steamer Albatross, the Coast 

 Survey and other explorations. It in- 

 cludes a check-list of the Decapoda of 

 the region, figures of many nf the little- 



known forms, and much new information 

 concerning them, especially as regards dis- 

 tribution. 



Further Notes on the Heart of Molgula 



manhattensis Verrill: George Willum 



Hunter, Jr., New York city. 



Research by means of the intra-vitam 

 method of staining with methylene-blue 

 points to a connection between the gan- 

 glion cells of the heart and those of the 

 central nervous sysfem. The course of 

 the connectives is as yet not fully worked 

 out. 



The following physiological data seem 

 to point to this connection in animals in 

 which the ganglion or dorsal nerve chain 

 is partly or wholly destroyed: 



(a) The heart beat (variable within 

 limits) is appreciably slower. 



(&) A lack of coordination between the 

 two ends of the heart appears. 



(c) There is sometimes great irregu- 

 larity in the heart rhythm. 



(d) The heart beats on occasions for 

 from two to three hours in a given direc- 

 tion without reversal. (The normal heart 

 usually reverses every one to two minutes. ) 



Certain substances (cafifein, muscarine, 

 nicotine, strychnine, et al.), heart depress- 

 ors or accelerators, which are believed to 

 act upon nerve cells or endings in the 

 heart or in the sympathetic s.ystem of ver- 

 tebrates, act in a similar manner upon the 

 normal heart of Molgida. In the caiater- 

 ized animal, however, no such results are 

 obtained. 



On the Morphological and Physiological 

 Classification of the Cutaneous Sense 

 Organs of Fishes: C. Judkon IIerrick, 

 Denison University, Granville, Ohio. 

 The proper interpretation of these sense 

 organs has heretofore not been possible, 

 because the problem has not been ap- 

 proached with sufficient breadth of view. 

 Taking into account structure, innorva- 



