RATA INGOLFIANA. 327 



Disk shaped like that of R. eglanteria, Plate 23, length of body about two 

 thirds of the width, front angle near 115°, lateral angles nearly 90° and narrowly 

 rounded; anterior margins shghtly sinuous; hinder angles rounded. Mouth 

 waved, width two thirds of the distance from the end of the snout; teeth flat- 

 tened, rounded, median more conical in males, in about 44 rows. Upper and 

 lower surfaces rough with small scales, larger on the head and on the middle 

 of the body. A vertebral series of large rounded bony bucklers with sharp 

 compressed cusps from the head to the second dorsal; two lateral rows of bucklers 

 at each side of the tail, a large buckler on the outer end of each shoulder, one 

 in front of each eye, one or two behind each spiracle, one behind another on the 

 end of the rostral cartilage, a large one opposite each eye near the margin and 

 others scattered over the upper and the lower surfaces of the body gill chamber 

 and bases of the pectorals. Young are less rough and have fewer bucklers; 

 very young are nearly smooth. Males at hand are more smooth than females 

 and lack many of the tubercles. Total length 30.25, snout to ends of pectorals 

 15, snout to abnominal pores 14.75, and greatest width 21.5 inches. 



Brown to reddish brown, with or without numerous spots of brown and 

 with u'regular dark-edged spots of white. 



Norway to Madeira; Mediterranean. 



RaIA INGOLFIANA. 

 Rata ingolfiana Lutken, 1898, Danish Ingolf exped., 2, p. 3, pi. 1, f. 1. 



Compared with Rata hyperhorea the disk of this species is not so angular, 

 the anterior margins are straighter, and the tail is longer and more robust. 

 Disk nearly one fourth broader than long, front angle less than 90°, snout not 

 produced, anterior margins shghtly undulated, outer and hinder angles and 

 hinder margins broadly rounded. Mouth moderate, little arched, width nearly 

 half the distance from the end of the snout. Teeth small, pointed. Eyes 

 medium, orbits two thirds of the interorbital width, or one fourth of the length 

 in front of them. Spiracles smaller than the eyes. Tail little longer than the 

 body, not produced behind the dorsals. Dorsals not separated by a space with 

 spines. Back and head with scattered spinules, more abundant along the 

 anterior margins, larger above the middle of the rostral cartilage. A paii- of 

 tubercles in front of and one or more behind each eye, a triangular group of three 

 on each shoulder, a lateral series on each side of the tail, and a close-set median 

 series of larger ones (47) from the head to the dorsal fin. Lower parts smooth. 



