168 BULLETIN OF THE 



Ehinobatus lentiginosus n. sp. 



Outlines of body and fins similar to those of HorJcelii and undulatus. Eos- 

 tral cartilage long and narrow, a small groove near the head ; ridges close 

 together from base to extremity. Eyes large. Spiracles half as large as the 

 eyes, with two folds. Head narrow, concave between the eyes. The width 

 of the interocnlar space equals that of the nostrils or their distance apart. 

 Half the length of the snout is less than the distance between the outer angles 

 of the nostrils. Mouth nearly straight, a little less than twice the width of the 

 head between the eyes. Scales small, smooth. Spines of the dorsal series and 

 the three in front of each eye very small ; those above the eye and spiracle not 

 noticeable. No larger spines on shoulders or rostrum. The largest spines on 

 the body are a group of five on the top of the end of the snout. 



Color a light grayish-brown freckled with small spots of lighter ; uniform 

 brownish below. On the lower side of the snout there are faint indications of 

 markings similar to those of undulatus. 



Distinguished from Horkelii and undulatus by the colors, the horn-like 

 spines on the end of the snout, the absence of spines on the shoulders, the 

 narrowness of the head as compared with the width of the mouth, the shorter 

 distance from snout to mouth, and the greater distance from mouth to vent. 

 Total length 22.9, snout to mouth 4.1., snout to vent 9.9, and width of pectorals 

 7.4 inches. 



An adult female secured in Florida by Prof. L. Agassiz. 



Rhinobatus planiceps n. sp. 



Disk, including ventrals, rhombic, about one and a half times as long as 

 wide. Anterior borders of pectorals straight, more than twice as long as the 

 convex posterior margins. Angles of pectorals rounded, the hinder not extend- 

 ing farther than to the vent. Outer angle of ventrals rounded, posterior acute. 

 Head broad, flat. Eostral cartilage medium, dilated at the extremity, with the 

 ridges close together in the anterior third of their length. Snout rather broad, 

 with rounded extremity. Eyes moderate. Spiracle immediately behind the 

 eye, smaller than the orbit, with a single fold on the posterior side. Anterior 

 nasal valve not dilated ; posterior two-lobed. Mouth nearly straight. Body 

 covered with shagreen above and below. Tail much depressed, with a fold on 

 each side. Second dorsal distant from the caudal the length of its base. Bases 

 of the dorsals distant from each other the length of the anterior borders. 

 Scales larger over the central portions of the disk. Compressed hooked spines 

 in a median row on back and tail, in two patches on each shoulder, and a 

 series above each eye. On the young these spines are much more prominent 

 and regular in size than on the adult. 



Color brown, light between and on each side of the rostral ridges ; white 

 below. Young specimens with a number of small round white spots on each 

 side of the dorsum. 



The following measurements are taken from a young male : — 



