144 ' ENDEAVOUR " SCIENTIFIC RESULTS. 



Family HISTIOPTERID^E. 

 Genus QUINQUARIUS, Jordan. 



Pentaceros, Cuvier and Valenciennes, Hist. Nat. Poiss., iii., 



1829, p. 30 (P. capensis, Cuv. & Val.). Not Pentaceros, 



Schultze, 1760. 

 Quinquarius, Jordan, Proc. U.S. Nat. Mus., xxxii., 1907, pp. 



236, 238 (Q. japonicus, Doderlein). 

 Quadrarius, Jordan, Loc. cit. (Pentaceros decaca.nthus, 



Giinther). 



The name Quinquarius was proposed by Jordan to replace 

 Pentaceros, which is preoccupied. He also established another 

 genus Quadrarius for Pentaceros decacanthus, Giinther, which 

 only differs from P. capensis in the number of its dorsal and 

 anal spines ; but the discovery of other allied species in which 

 the number of spines differs from both Quinquarius and 

 Quadrarius indicates that this character is not of generic 

 value. 



Pseudopentaceros, Gill 1 ( = Gilchristia, Jordan) 2 , with Pen- 

 taceros richardsoni, Smith, 3 for its type, is possibly also 

 identical with Quinquarius, in which case Gill's name would 

 have to be used. Smith's figure of the species, however, 

 suggests that there are other characters besides the increased 

 number of dorsal spines to distinguish it. 



QUINQUARIUS HENDECACANTHUS, sp. nov. 

 (Plate xxvi., figs. 1-3.) 



D. xi./13-15 ; A. iv./10-ll ; V. i./5 ; P. 17 ; C. 17. Height 

 1-8 in the length from the snout to the base of the caudal 

 rays ; head 2-8 in the same. Eye 2-9 in the head, almost 

 equal to the interorbital width, and but little shorter than 

 the snout, which is 2-6 in the head. Fourth dorsal spine 1-2, 

 second dorsal ray 2-5, second anal ray 2-3 in the head. 

 Pectoral 1-08, ventral spine 1-9, and caudal peduncle 3 in 

 the head. 



Body compressed, elevated, with the ventral surface some- 

 what flattened, the width in front of the ventral spines is 

 about half the length of the head. A few scales on the cheeks 

 are disposed in about five rows. All the rest of the head and 

 scapular regions are covered by strong rugose bones, which 

 are more or less radiately striated. Upper profile of head 



1. GUI Mem. Acad. Sci. Wash., vi., 1893, p. 116. 



2. Jordan Proc. U.S. Nat. Mus., xxxii., 1907, p. 236. 



3. Smith Illustr. Zool. S. Africa, Pisces, 1849, pi. xxi. 



