PKOCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 623 



Pearl Islands belong to this species. They are of the same size and 

 general apj)earance as the original types from Mazatlan. The anal 

 rays are qnite constantly 13, and the body is exceedingly slender, the 

 depth being about | the length. 



17. Pcecilia elongata Giiuther. 



18. Ophisurus xysturus Jor. & Gilb. 



Three fine examples, the • longest 28 inches long, from Mazatlan, 

 Acapulco, and Panama, respectively. These specimens vary from tlie 

 original types from Mazatlan in the following respects : The vomerine 

 patch of teeth is broader, with a well-marked constriction anteriorly, 

 with teeth arranged in about three irregular series ; the eye is con- 

 tained twice in snout, which is f interorbital space ; length of pectoral 

 less than width of gill-opening. The dark spots are arranged more 

 regularly, those of the upjier two series nearly equal in number. The 

 specimen from Mazatlan has the spots of the upper two series corre- 

 sponding, while in the other two specimens they alternate. Spots on 

 dorsal fin distinct, not confluent. In the smallest specimen (from Pan- 

 ama) the head is contained but three times in the trunk. 



19. Ophichthys zophochir Jor, & Gilb. 



A fine specimen, about 2 feet long, collected by Mr. J. A. Sutter at Aca- 

 pulco. The species was hitherto known only from Mazatlan Harbor. 



20. Sidera panamensis (Steind.) J. & G. 



Mura'na imiiamensis Stemdachner, Iclitli. Beitr. V, 19 ; uot Sidera lyanamensis 

 J. & G., Bull. U. S. Fish. Com., 1882, 106 = Sidera castanea J. & G., MSS. 



Three specimens from Pearl Islands, the largest 10 inches long, an- 

 swer perfectly to Steindachner's description of this species. 



21. Sidera verrilli sp. nov. 



A single specimen in the Yale College Museum, 17J inches long, col- 

 lected by Professor Bradley at Panama, serves as the type of the fol- 

 lowing description : 



Body comparatively slender, the tail about equal to the rest of the 

 body. Head 3| in length of trunk. Cleft of mouth moderate, 3 in 

 head. Mandible somewhat curved, and the teeth very long, so that 

 the mouth does not admit of being completely closed. 



Teeth everywhere uniserial, those on sides of mandible strong, com- 

 pressed, hooked backwards, about 13 in number on each side, the teeth 

 growing gradually smaller backwards, those next angle of mouth very 

 small ; 4 or 5 anterior teeth on each side very large, subequal. Teeth 

 of upper jaw in all respects similar to those in the lower, and in equal 

 number. A short row of very small teeth on vomer posteriorly ; the 

 anterior canines wanting in our specimen (perhaps lost); teeth all ap- 

 parently entire. 



Eye rather large, somewhat nearer angle of mouth than tip of snout, 



