40 SCIENCE PROGRESS 



Other papers include : 



Hausman, " The Orange-striped Anemone {Sagariia Iucxcb), an Ecological 

 Study " {Biol. Bull., vol. xxxvii, Dec. 19 19) ; and Bourne, " Observations on 

 Arachnactis albida, M. Sars " [Quart. Journ. Micro. Set., vol. Ixiv, Oct. 1919). 



A paper " On a New Type of Nephridia found in Indian 

 Earthworms of the genus Pheretina " is pubhshed by Bahl 

 {ibid., vol. Ixiv, Oct. 1919). The OHgochsetes and Hirudinea 

 in general possess what is designated a meganephric type of 

 nephridium, i.e. a few large segmental nephridia opening sepa- 

 rately to the exterior. Certain members of both groups also 

 have plectonephric varieties, i.e. numerous small nephridia 

 opening to ducts which generally lead to the exterior. The 

 new type, named " enteronephric," found in Pheretinids, con- 

 sists of numerous nephridia opening into systems of ducts, 

 which in turn lead into the gut. Small integumentary neph- 

 ridia also occur, each opening on to the surface of the body. 

 It is pointed out in a footnote that such a type of nephridial 

 system raises an interesting question as to the origin of these 

 structures, since there is a possibility of their not being deriva- 

 tives of the ectoderm. 



Other papers include : 



Hyman, " Physiological Studies on Planaria: III, Oxygen Consumption in 

 Relation to Age (Size) Differences " {Biol. Bull., vol. xxxvii, Dec. 1919) ; 

 Goodrich, " The Pseudopodia of the Leucocytes of Invertebrates " {Quart. 

 Journ. Micro. Sci., vol. Ixiv, Oct. 1919) ; Carrey, " The Nature of the Ferti- 

 lisation Membrane of Asterias and Arbacia Eggs " {Biol. Bull., vol. xxxvii, 

 Nov. 1919) ; Richards and Donnel, " Notes on the Effect of X-radiation on 

 the Development of Cumingia Eggs " {ibid., Oct. 19 19) ; Berry, " Light 

 Production in Cephalopods : I, An Introductory Survey" {ibid., Dec. 

 1919) ; and Barrows, " The Occurrence of a Rock-boring Isopod along the 

 Shore of San Francisco Bay, California" {Univ. Cal. Pub. Zool., vol. xix, 

 Dec. 1919). 



Arey and Crozier, in " The Sensory Responses of Chiton " 

 {Journ. Exp. Zool., vol. xxix, Oct. 1919), and Crozier and Arey 

 in " Sensory Reactions of Chromodoris zebra " {ibid.), record the 

 results of a series of investigations on the reactions of these 

 two molluscs. In both cases quite well differentiated receptive 

 mechanisms were discovered that are able to respond to tactile, 

 chemical, and photic stimuli. In the former case it is shown 

 that certain reactions vary with age. Both species show a 

 complex relationship with the varying conditions of the en- 

 vironment. In Chromodoris the animal through its eyes is 

 positively phototrophic, and in strong currents the rhinophores 

 act as directive organs for negative rheotropism. 



Other papers include : 



Minnich, " The Photic Reactions of the Honey-Bee " {Journ. E-vper. Zool., 

 vol. xxix, Nov. 1919) ; Seyster, " Eye-facet Number as Influenced by Tem- 

 perature in the Bar-eyed Mutant of Drosophila melanogaster (Ampelophora) " 



