GAllMAN: NEW PLAGIOSTOMIA. 205 



angle of the mouth ; no median tooth in the lower jaw. Labial folds short, al- 

 most hidden in the groove. Distance between the inner edges of the nasal valves 

 less than one third of tlie preoral length of the snout. First dorsal entirely in the 

 forward half of the total length. Hinder angles of pectorals and ventrals slightly 

 produced, longer on dorsals. Length of base of second dorsal less than three 

 fourths of that of the first, not including the spine, contained three and two thirds 

 times in the distance between the two spines. Ends of ventrals reaching back- 

 ward of the spine of the second dorsal. Scales small, with stout stalks, and with 

 several keels on the crown, the median one of which ends in a sharp cusp ; lateral 

 cusps rudimentary ; keels less sharp toward the apex of the scale on the flanks. 

 Brown, nearly uniform, sprinkled with white single scales. 



Distinguished from C tessellatus by larger dorsals, less production of hind 

 aiigles of dorsals, pectorals and ventrals, smaller sharper scales, smaller eyes, by 

 dentition, and by a darker more uniform coloration. 



No. 1049, Mus. Comp. Zool. of a total length of Z2\ inches. 



Hab. Japan. 



Centrophorus tessellatus, sp. nov. 



Closely allied to C. granulosus, spines and scales similar. Teeth |f, com- 

 pressed, serrated on the basal portions of the cutting edges ; upper with slender, 

 sharp pointed cusps, more numerous and more erect, becoming more oblique 

 toward the angles of the mouth ; lower with oblique laterally directed cusp situated 

 between two notches at the outer end of a serrated and arched portion of the cut- 

 ling edge; a median tooth on the symphysis below; several series in function in 

 the upper, and two in the lower. Labial folds extending less than half-way from 

 angle to symphysis. Internarial distance equal to more than half the distance 

 from the mouth. Spiracle large, superior, distant from tlie eye one and one half 

 times the spiracular diameter, up and backward. Posterior angles of dorsals, pec- 

 torals, and ventrals much produced ; length of base of first dorsal two fifths of the 

 distance from the second, base of second three fourths of that of the first, end of 

 pectoral reaching beyond the first dorsal spine; origin of first dorsal little back- 

 ward of the axil of the pectoral ; spine of second dorsal one third exposed; lower 

 lobe of caudal well developed, end of caudal deep. 



Light brownish on back and flanks, white below, a white band at margins of 

 fins and gill clefts. Total length 34| inches. 



No. 1031, Mus. Comp. Zuol. 



Hab. Lat. 35° N. ; Lon. 139° 30' E. 400 fathoms. 



The shagreen of this shark, from specimens of moderate size, is no doubt 

 as well adapted for covering the grip in the handles of sabres, swords, and other 

 cutlery as that of Centrophorus granulosus. 



Acanthidium Lowl, 1839. 



Ueama J. & S. 1902. 



In the collection there are representatives of three species, neither of 



which is to be identified with the previously described species, A. egkmfma 



of Japanese waters and A. calceus from the seas of Europe. Tliey are 



