226 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvii. 



tion, grooved hohind; iuiteriorl}^ there is a serrated, narrow keel 

 extending the length of the spine; posteriorl}'^ the edges of the spine 

 are smooth, except near the tip, where thej^ are minutely serrated. 

 The rays are attached to the basal third of spine only, longest rays 

 not reaching tip of spine. The dorsal fins are connected h\ a rayless 

 fold of skin. Second dorsal separated from caudal l)}^ a notch. Anal 

 and caudal continuous. Caudal filament very long and slender, the 

 distance from the end (notch) of the dorsal to tip of filament equal to 

 distance from end of dorsal to insertion of pectoral. Pectoral some- 

 what falcate, when depressed the tip reaching to middle of base of 

 ventral. Length of ventral contained 1^ times in dorsal spine. Clasp- 

 ers bifid, the length beyond point of division equal to li times the 

 diameter of pupil. Four spines on ventral edge of intromittent organ. 



Total length of specimen 29f inches with caudal filament. 



This species is named for Dr. Kakichi Mitsukuri 



