JAPANESE MOLLUSKS, TROCHID^. 101 



TJmboniuni costatum Lesson. I'ils., Man. Conch., XI, p. 54, pi. 59, f. 34, 35. 



Kii coast (Stearns) ; Simoda, Hakodate, Tsu-Shiraa, etc. (Ad.) ; 

 Nagasaki (Lischke). 



Very large specimens, measuring alt. 22, diam. 30 mm. The col- 

 oration is very uniform, consisting of narrow radial stripes of buff 

 and olive-bluish broken into a fine tessellation by the spiral 

 grooves of the upper surface, the base with coarser radial stripes, 

 sometimes interrupted ; umbilical callus purplish-pink. 



TJmbonium costatum var. superbum Gould. Lischke, J. M. C, II, p. 83, pi. 5, f. 

 18-21. 



Nagasaki (Lischke) ; Kagoshima (N. P. E. E.); Inland Sea, Hizen, 

 near Enoshima (Stearns). 



Very extensive suites of this form were collected by Mr. Stearns ; 

 and a critical examination shows that there is really no character 

 whatever separating them from U. costatum except size. The sub- 

 sutural fasciole is sometimes smooth, but more often more or less 

 tuberculate ; and specimens occur which are very diflferent to distin- 

 guish from U. moniliferum. Mr. Stearns has assorted the forms into 

 numerous color varieties which he designates by letters. The more 

 notable of these are as follows : 



(1). Coloration as described above for U. costatum, the stripes 

 above continuous or tessellated, periphery often with a white and a 

 red girdle, (Nagasaki, Kii). (See Lischke, II, pi. V, f 20, 21). 



(2). Same pattern as above, but ground color orange, stripes faint 

 olive; base without stripes, red or yellow. 



(3). Same as No. 1, but with wide blotch-like stripes at and below 

 the periphery. (See Lischke, f. 18, 19). 



(4). Entire surface blue-black or purple-black, callus fleshy. 

 (Hizen). 



(5). Ground color and subperipheral fasciole red, stripes close and 

 dusky ; interstices between spiral cords pure white. This is the most 

 remarkable and lovely pattern. The base is articulated, broadly 

 striped or uniform. 



(6). Groundcolor almost white; stripes or tesellation very pale 

 bluish or brown ; callus white or fleshy. (Inland Sea). 



(7). Stripes broad and red, on a yellow ground. 



(8). Upper surface with broad white zone. One specimen of this 

 variety lacks spiral sulci, and has very convex whorls. 



