PLATOSOMIA. 21 



opinions of Vaillant, 1888, Trav. et Tal. Poiss., 80, and of Goode and Bean, 

 18'JG, Oc. Icli., 31, to the contrary notwithstanding. The egg figured by 

 Alcoclv, 1891, Ann. Mag. Nat. Hist., (6) VIII., fig. 1 on p. 22, as " Callo- 

 rhjnchus ? sp." is intermediate between the egg of C. caUorJiz/nchus herewith 

 figured and that figured by Giinther, 1889, Ann. Mag. N. H., (6) IV., 416, 

 as the egg of Chimaera. Evidently Ak;ock's figure does not represent the 

 egg of CaUorhyiiclius calhrhijuchus Linn., and, though it may ultimately liave 

 to be transferred to another genus, it might for the present be cited as 

 Callorkynclms indicus. A recent addition to the group is the peculiar genus 

 Harriotta of Goode and Bean, 1894, Pr. U. S. Mus., XVII., 471. This genus 

 contains a single species, II. Eakit/hana, Avhich possesses a known horizon- 

 tal range included between the parallels of 36" and 40' of north latitude, 

 and the meridians of 70' and 75^ west longitude, with a vertical range so 

 far as determined extending from a depth of 707 fathoms to one of 1081, 

 off the eastern coasts of the United States. 



Present knowledge of the distribution of the Holocephala of great 

 depths is approximately set forth in the list of the known species below. 



PLAGIOSTOMIA. 



Plagiostomes Dum., 1806, Zoologie Analytique. 

 Plagiostomia Raf., 1815, Analyse de la Nature. 



PLATOSOMIA. 



Ptatosomia Eaf., 1815, Analyse de la Nature. 



Though outside of the Raiaj only one trulj'' bathybial species- of this 

 group has been taken, there is abundant reason for believing the number 

 will yet be greatly increased. Tlie recent discovery of the blind Torpedo, 

 Benthobatis, by Alcock, is a strong intimation that many if not all the 

 different families of the flat-bodied Selachians, like the various shoal water 

 Teleosts, also have their bathybial forms. 



The material at pi'esent under study contains a single representative 

 of the genus Eaia, described below, but that one is of much interest on 

 account of its locality, and its depth with one exception is the greatest 

 recorded for the genus. The distribution of the deep sea species com- 

 monly placed in Eaia corresponds somewhat closely with the distribution 

 of the species of that genus known to be inhabitants of the waters near 



