PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 621 



2. Mustelus sii. 



f f Mustelus mento Cope, Proc. Am. Pliilos. Soc. XVII, 1877, 47. 



Three specimens, each about 10 inches long, in poor condition. The 

 fins are mnch larger than in M. himilatus, the space between dorsals 

 being bnt twice base of first dorsal and 2^ times base of second. The 

 color is also much darker, that of the fins nearly uniform dusky, with 

 lighter edges. M. lumilatns was hitherto known only from Mazatlan, 

 unless indeed Mustelus mento Cope, from Peru, should prove to be the 

 same. 



3. Urolophus halleri Cooper. 



Two specimens. The species has now a recorded range from Panama 

 to Point Conception, Cal. It is abundant onlj^ along the northern part 

 of this range, from San Diego to Santa Barbara. 



4. Syrrhina exasperata (Jor. & Gilb.) Garmau. 



Two adult female specimens, each over 20 inches long, are in the col- 

 lection made by Mr. Bradley at Panama. The species was hitherto 

 known only from Southern California, and was represented in collections 

 by numerous immature males collected by ourselves at San Diego, and 

 by a single adult male (type of Trygonorliina alveata Garman) in the 

 Museum of Comparative Zoology at Cambridge. 



The following points in regard to these female specimens are worthy 

 of note : The general plan of coloration is the same as in males, includ- 

 ing the large black blotch covering posterior angles of i3ectorals below ; 

 the u])per side of disk has, however, several round yellowish spots as 

 large as pupil, each spot ocellated with blackish ; a very distinct spot 

 on each side of shoulder; a second on pectoral fins near posterior angle; 

 and a third midway between the latter and median line of back ; several 

 other less conspicuous spots near middle of back anteriorly. The dis- 

 position of spines and prickles above is the same as in males ; but below, 

 the entire surface of body and tail is covered with uniform fine shagreen, 

 instead of being largely naked. 



Disk somewhat broader than long, the length slightly greater than 

 that of tail. 



5. Arms brandti Steind. 



6. Arius alattis Steiiid. 



Two specimens, each about 10 inches long. Head 3f in length ; maxil- 

 lary barbel reaching nearly to tip of pectoral spine. 



7. Arius kessleri Steiud. 



A single specimen shows the following characters: Head very coarsely 

 granulai", the occipital process narrowly triangular and sharply keeled, 

 rounded posteriorly; the antedorsal shield very narrow, about half 

 diameter of orbit. Humeral process with few granulations. Maxillary 

 barbel barely reaching base of pectoral spine. Vomerine patch of teeth 

 much narrowed toward median line, and divided by a furrow, Fon- 

 tanelle club-shaped. 



