PLATOSOMIA. 21 
opinions of Vaillant, 1888, Trav. et Tal. Poiss., 80, and of Goode and Bean, 
1896, Oc. Ich., 31, to the contrary notwithstanding. The egg figured by 
Alcock, 1891, Ann. Mag. Nat. Hist., (6) VIII, fig. 1 on p. 22, as “ Callo- 
rhynchus? sp.” is intermediate between the egy of C. callorhynchus herewith 
figured and that figured by Giinther, 1889, Ann. Mag. N. H., (6) IV., 416, 
as the egg of Chimaera. Evidently Alcock’s figure does not represent the 
egg of Callorhynchus callorhynchus Linn., and, though it may ultimately have 
to be transferred to another genus, it might for the present be cited as 
Callorhynchus indicus. A recent addition to the group is the peculiar genus 
Harriotta of Goode and Bean, 1894, Pr. U.S. Mus., XVIL., 471. This genus 
contains a single species, 7. Raleighana, which 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. 
Platosomia Raf., 1815, Analyse de la Nature. 
Though outside of the Raiz only one truly bathybial species of this 
group has been taken, there is abundant reason for believing the number 
will yet be greatly increased. The 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 present under study contains a single representative 
of the genus Raia, 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 Raia corresponds somewhat closely with the distribution 
of the species of that genus known to be inhabitants of the waters near 
