PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 135 



Eaia cooperi has the snout acutely produced, rather more so than in 

 R. binoculata, thouf>h less than in the variety referred to, the distance 

 from the eye to the tip of the snout being about twice the interorbital 

 width. The length of the disk is § its width; the tail is § the length of 

 the disk. The female is covered above with small stellate prickles, 

 which are larger over the eye, on posterior edge of pectorals, on ven- 

 trals, the middle line of the back, and on the tail. Prickles on tail in 

 several series. Diflerentiated spines present only over eye and on 

 tail. The male is nearly smooth, its spines essentially as in B. hiiio- 

 culata. Color brown, with paler blotches ; a large, obscure, blackish 

 blotch at base of i^ectoral. This species has scarcely a trace of caudal 



44 

 40" 



tin, and is therefore likewise an " JJraptera.''^ Its teeth are about 



^Yhether this Baia cooperi is a distinct species or merely very old indi- 

 viduals of Raid hinoculata we are now unable to decide. There are no 

 important ditierences, except such as might accompany increased age. 



Table of measurements. 



Extreme length, in inches 



Lenijthof disk, in inches 



Disli: 



Greatest width (hundredths of length of disk) 



Greatest width at front of e.ves 



Width of snout, midway between eyes and tip of snout. 



Distance from shout tofirst gill-opening 



Distimco between tirst gill-openiugs 



Distance between last gill-openings 



Distance from first to last gill-openings 



Width of mouth 



Width of interorbital space 



Distance from snout to mouth 



Diameter of orbit 



Tail : 



Length 



Distance between dorsals 



Height of first dorsal 



_ Length of base of tirst dorsal 



liaia 

 stellulata. ? 



17.45 

 10.10 



121 

 58 

 41 

 43 

 31.5 

 18 

 14 

 IS 

 8 

 24 



71.5 

 5 



7.5 



Eaia 

 binoculata. d 



21.6 

 13.00 



106 

 45.5 

 16.7 

 50.5 

 25.5 

 14.3 

 12.8 

 15 



7 

 2L5 



6.2 



67 

 3.8 



liaia 



hinoculata 



var. ? ? 



28.8 

 18.4 



103 

 41 

 14 



12 



15. 5 



Monterey, Cal., April 7, 1880. 



DESCRIPTIOIVM OF IVEIT SPECIES OF XIPIIISTFB AIVD APODICH- 

 THYS, FKOM MOIVTJEBEY, CAX^IFORNIA. 



By DAVID S. JOBDARf and CHARI.ES H. <j}IL.BE:RT. 



1. Xiphister chirus sp. nov. • 



Body elongate, somewhat comj)ressed, formed as in XipMster miicosus 

 {Xiphidion mucosum Girard). Head short, convex in protile, not de- 

 pressed above the eyes. Mouth small, oblique, the maxillary extending 

 to opposite middle of pupil. Eye small, as long as snout, about 5 in 

 head. Lower jaw slightly projecting. Teeth strong, the anterior canine- 

 like, bhmtish; four canines in lower jaw, six or more in the upper, similar 



