acthor's abstract of this paper issued 

 bt the bibliographic service, february 27 



THE COMPARATIVE MORPHOLOGY OF THE SECOND- 

 ARY SEXUAL CHARACTERS OF ELASMOBRANCH 

 FISHES 



THE CLASPEES, CLASPER SIPHONS, AND CLASPER GLANDS 



MEMOIR III 



W. HAROLD LEIGH-SHARPE 



London, England 



FIVE FIGXTRES 



The pre\'ious memoirs appeared in the Journal of IMorphology 

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

 volume 35, page 359, 1921. The first contained a general intro- 

 duction to the subject and an account of Scylhum catulus, S. 

 canicula, Acanthias \Tilgaris, and Raia circularis. The second 

 dealt with Galeus \ailgaris, JNIustelus \'ulgaris, Lamna cornubica, 

 and Rhina squatina. 



The present memoir describes the following species: 



Cladoselache kepleri 192 



Pleuracanthus parallelus 193 



Squaloraja polyspondyla 193 



Rhinobatus intermedius 197 



Cyclobatis oligodactylus 197 



The fossil aspect of this subject is unsatisfactory. Soft parts, 

 the clasper siphons and clasper glands, as is only natural, are not 

 preserved. The claspers, mainly the skeleton, alone are in- 

 dicated. After an examination of the fossil collection in the 

 Natural History branch of the British jMuseum, South Kensing- 

 ton, London, England, by the courtesy and under the personal 

 superintendence of Dr. A. S. Woodward, I have selected five 

 examples which have some bearing on the matter. 



191 



