502 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.55. 



Habitat. — Off Nelson Strait, southern Chile, in latitude south 51°, 

 52', in 348 fathoms, mud, bottom temperature 49.9° ; United States 

 Fish Commission steamer Albatross. Cat. No. 96935, U.S.N.M. 



NUTTALLINA ALLANTOPHORA, new species. 



Chiton with the broad flattish valves of N. magdalena., feebly mucro- 

 nate, black, with the girdle set with black, white, and brown slightly 

 curved stout sausage-shaped spines, smaller toward the margin, some 

 over a millimeter long; the interior of the valves a very dark green 

 with a very wide shallow sinus; anterior valve semicircular with a 

 white ray, covered with minute pustules, partly ocular, and a micro- 

 scopic decussation; posterior valve small and axially narrow with a 

 posterior mucro and sculpture like that on the head valve; inter- 

 mediate valves with the jugal area not distinct from the pleural 

 tracts and the lateral areas indicated only by a faint elevation above 

 the pleural tracts and sculptured like the rest of the shell. Length, 

 25 ; width of valves, 15 ; height, 6 mm. 



TIahitat.— Los Animas Bay, W. J. Fisher. Cat. No. 110360 «, 

 U.S.N.M. 



The armature of the girdle is quite sufficient to distinguish this 

 from any of the related species. 



NUTTALLINA MAGDALENA, new species. 



Chiton of moderate size with a wide dusky girdle covered with 

 dense microscopic spinules so as to form a velvety surface with a few 

 long white spines, more abundant toward the edge of the girdle, which 

 with a very narrow strip crosses the region between the valves; the 

 general color is greenish or purplish black, with whitish streaks along 

 the dorsal ridge ; the interior is greenish, or white with green in the 

 jugal sinuses; anterior valve with 7 to 9 slits, the outer side of the in- 

 sertion plates striated ; posterior valve with seven slits, the insertion 

 plates smooth ; the intermediate valves with one slit at each end ; an- 

 terior valve semicircular with irregularly scattered globular pustules 

 and a microscopic fine decussation ; posterior valve wide, short, with 

 terminal mucro, the central area with axial beaded threads with wider 

 interspaces, the posterior tract pustulate; the intermediate valves 

 mucronate, with the jugal area simpl}' axially threaded; the pleural 

 tracts with more or less oblique beaded threads merging laterally into 

 rows of pustules; the lateral areas smooth, not ribbed, with sparsely 

 scattered pustules; internally with the jugal sinus very wide and shal- 

 low, the sutural laminae long and wide. Length, 26; width, 12; 

 height, 7 mm. 



Hahitat. — Magdalena Bay, Lower California, C. R. Orcutt. Cat. 

 No. 217924, U.S.N.M. 



This species has very much wider and less interrupted valves than 

 either of those previously described, while it is destitute of the strong 

 ribbing which they display and has different minor sculpture. 



