12 CALIFORNIA ACADEMY OF SCIEJ^CES [Proc. 4th Ser. 



8, intermediate valves with 1-1. posterior valve with 1-1 

 slits and a strong baj- or sinus in the medio-posterior margin. 



Girdle rather narrow, clothed above with a fine armature 

 of numerous, microscopically minute spinelets, and in addition 

 bearing a large number of beard-like setse in several series, 

 one. which we may denote as the primary or sutural, com- 

 prising much larger, darker colored, and very definitely placed 

 bristles, as compared with those of the other series, one 

 standing in the angle of each suture, two behind the tail 

 valve, and perhaps six or seven around the head valve; re- 

 maining setse more numerous near margin; all more or less 

 broken in the specimen at hand. Individual setae long, 

 slender, bearing numerous, slender, recurved, hair - like 

 branches along the upper side. 



Ctenidia 14 on a side. 



Color of outer surface of shell a soiled brownish cream, 

 abundantly painted and mottled with light yellowish brown. 

 Interior of shell white. Girdle brownish. 



Measiirements: Maximum length of type specimen, 16.5; 

 maximum wndth, 9.0; altitude, 3.0; length of shell only, 15.0; 

 width of tegmentum in valves iv. and v., 7.0 mm. 



Type: A specimen preserved in alcohol [S. S. B. 549], com- 

 prising Cat. No. 1769 of the author's collection. 



Type Locality: On a fragment of rock from ledge off 

 Point Pinos, Monterey Bay, California; "depth probably 200 

 ft."; H. Heath, summer, 1904; one specimen. 



Remarks: This very odd appearing little chiton is evi- 

 dently a member of the same group as the two Carpenterian 

 species, sinnata and hnporcata, but is readily distinguishable 

 from either by its unique and very elegant pattern of sculp- 

 turing, notably by such details as the heavy pustulation of 

 the lateral tracts and the sinuous, buttressed riblets of the 

 central areas. 



No specimens other than the type have thus far come to 

 hand. 



The specific name is derived from the Greek <t>6piJiiv^ — a 

 much ornamented kind of lyre, and is chosen primarily with 

 reference to the above-mentioned sculpturing of the central 

 areas. 



