author's abstract op this paper issued 

 by the bibliographic service, february 27 



THE COMPARATIVE MORPHOLOGY OF THE SECOND- 

 ARY SEXUAL CHARACTERS OF HOLOCEPHALI 

 AND ELASMOBRANCH FISHES 



THE CLASPERS, CLASPER SIPHONS, AND CLASPER GLANDS 

 MEMOIR IV 



W. HAROLD LEIGH-SHARPE 



London, England 



TWENTY-TWO TEXT FIGURES^ 



The preceding memoirs appeared in the Journal of Mor- 

 phology as follows: Memoir I, volume 34, page 245, 1920; 

 Memoir II, volume 35, page 359, 1921; Memoir III, volume 36, 

 page 191, 1922. The first two contained an account of the 

 commoner British species, Scyllium catulus, S. canicula, Acan- 

 thias, Raia, and Galeus, Mustelus, Lamna, Rhina, respectively. 

 The third dealt exclusively with the fossil aspect of the subject. 

 The present paper describes certain species to which I have 

 kindly been allowed access at the Natural History Branch of the 

 British ]V[useum, South Kensington, London, viz.: 



Chiloscyllium punctatum 200 



Prist iurus melanostomiis 201 



Chimaera monstrosa 201 



Callorhynchus antarcticus 208 



Torpedo marmorata 213 



Trj^gon pastinaca 215 



Myliobatis aquila 217 



Rhinobatus productus 218 



^ The figures are specially drawn from the author's dissections and ' preparations 

 by Miss Edith C- Humphreys, to whom best thanks are tendered. 



199 



