32 SCIENCE PROGRESS 



to his notice in working out the species in two collections. He 

 therefore set to work to investigate the various anatomical 

 characters of a large number of such forms, and the present 

 paper is a full statement of his conclusions on the subject. 

 His classification necessitates a considerable revision and 

 rearrangement of the families, and he has furnished definitions 

 of new and revised families, and also their contained genera. 

 This comprises the last part of the paper, but in order to 

 make this portion easy to follow, he has prefaced it by a full 

 account of the anatomical characters upon which it is based, 

 and a discussion of a number of other relevant matters. It 

 also includes contributions to the anatomy of various species. 

 Other papers include : 



Gothlin, " Experimental Studies on Primary Inhibition of the CiUary 

 Movement in Beroe cucumis " {Jour. Exp. Zool., vol. xxxi. No. 4. Nov. 

 1920) ; Hickson, " On the Occurrence of Protohydra in England " {Quart. 

 Jour, Micro. Set., vol. Ixiv, pt. 4, July 1920) ; and Parker, " Activities of 

 Colonial Animals: I. Circulation of Water in Renilla" {Jour. Exp. Zool., 

 vol. xxxi, No. 3, Oct. 1920), and " Activities of Colonial Animals : II. 

 Neuromuscular Movements and Phosphoresence in Renilla" {ibid., No. 4, 

 Nov, 1920). 



Coe, in " Sexual Dimorphism in Nemerteans " {Biol. Bull., 

 vol. xxxix, No. I, July 1920), and again in conjunction with 

 Ball in " The Pelagic Nemertean Nedonemertes " [Jour. Morph., 

 vol. xxxiv. No. 3, Dec. 1920), has called attention to the fact 

 that some of these worms exhibit true sexual dimorphism, 

 extending to the number and position of the gonads and also 

 to the external form. This is perhaps most strongly marked 

 in Nedonemertes, where the two forms were formerly con- 

 sidered as belonging to two separate genera. 



Other papers include : 



Boyd, " A Possible Intermediate Host of Fascicola hepatica L. 1758 in 

 North America " {Jour. Parasit., vol. vii, No. i, Sept. 1920) ; Chandler, " A 

 New Record of TcBtiia conjusa, with additional Notes on its Morphology " 

 {ibid.) ; Cort and Nichols, " A New Cystophorus Cercaria from California" 

 {ibid.) ; Kamm, " The Development of Gregarines and their Relation to 

 the Host Tissue" {ibid.); Leon, " Dibothriocephalus tceniodes, Leon, a new 

 Case in Roumania " {ibid.) ; Taliaferro, " Reactions to Light in Planaria 

 maculata, with especial reference to the Function and Structure of the Eyes " 

 {Jour. Exp. Zool., vol. xxxi. No. I, July 1920) ; Van Cleave, " Acantho- 

 cephala Parasitic in the Dog " {Jour. Parasit., vol. vii. No. 2, Dec. 1920) ; 

 and Yokogawa, " On the Migratory Course of Trichosomoides crassicauda 

 (Bellingham) in the Body of the Final Host " {Jour. Parasit., vol. vii. No. 2, 

 1920), and " A New Nematode from the Rat " {ibid.. No. i, Sept. 1920). 

 Papers on MoUusca include : Crozier, " Notes on some Problems of 

 Adaptation : I. On the Reformation of the Mantle-glands of Chromodoris " 

 {Biol. Bull., vol. xxxix. No. 2, Aug. 1920) ; Kjerskog-Agersborg, " The 

 Utilisation of Echinoderms and of Gasteropod Mollusks " {Amer. Nat:, 

 vol. liv. No. 634, Oct. 1920) ; and Lange, " On the Regeneration and Finer 

 Structure of the Arms of the Cephalopods " {Jour. Exp. Zool., vol. xxxi, 

 No. I, July 1920). 



