64 



OPHIOZONA. 



This large and very characteristic species has been taken at Rio 

 Janeiro by Professor Kroyer. 



LIST OF SPECIMENS. 



OPHIOZONA=^ Ly^lln. 



Ophiolepis Mull. & Trosch., pars. 



Disk covered with radial shields and stout scales, each larger one, 

 above, being surrounded by a belt of smaller ones. Over the base of 

 each arm, a small notch in the disk. Genital scales thick and conspic- 

 uous. Teeth. No tooth-papilla?. Mouth-papillie. Side mouth-shields 

 wide, and nearly, or quite, meeting within. Arm-spmes arranged along 

 the outer edge of the side arm-plates. No supplementary pieces to the 

 upper arm-plates. Two genital slits, beginning at the sides of the 

 mouth-shields. 



GROrPING OF SPECIES HEREIN DESCRIBED. 



Arm-spines nearly as long as arm-joints ; lowest ones longest, 0. impressa. 



Arm-spines very short, and of equal lengths, 0. pacijica. 



Ophiozona impressa Ltman. (Fig. 4.) 



Ophiolepis impressa Lutken. Addit. ad Hist. Oph., p. 101. 



Special Marks. — Arms four or five times the diameter of the disk. 

 Five moderately stout arm-spines ; the two lowest longest, and nearly 

 as long as the arm-joints. Disk-scales overlapping, the larger ones 

 nearly circular. 



* *O0ir, snake ; (avr), belt. 



