1904.] NATURAL SCIENCES OF PHILADELPHIA. 33 



angular periphery and flat lower surface. It holds a relation toward 

 T. conus somewhat similar to that existing between T. maximus Koch 

 and T. niloticus L. 



This form seems to be identical with 7\ turris Philippi, Zeitschr. /, 

 Malak., 1846, p. 102 {preoc.) = T. alius Phil., Conchyl. Cab., p. 217, PI. 

 32, fig. 7 (not of Perry, 1811). The habitat of Philippi's species was 

 unknown, but Dunker has reported it from the Inland Sea of Japan. 



Four recent species of the typical section of Trochus are now known : 

 T. niloticus, T. maximus, T. conus and T. hirasei. 

 Chlorostoma rugatum Gld. 



Gld., Otia Conch., p. 158. 



C. turhinatum A. Ad., Pilsbry, Catal. Mar. Moll. Jap., p. 94, PI. 6, figs. 9, 10. 

 Not of A. Adams. 



I formerly figured this under the erroneous name C. turhinatum, but 

 Adams described that species as umbilicate, while this is imperforate. 

 The figures cited above are from specimens from Hakodate, the type 

 locality. The species extends down the ocean coast of Nippon to 

 Sagami Bay, where it has been found at Hayama, near Kamakura, by 

 Miss A. C. Hartshorne. 

 CMorostoma rugatum sublaevis n. subsp. PI. V, fig. 50. 



Shell imperforate but with a rather deep pit in the place of the filled 

 umbilicus, shaped like C. rugatum or more depressed, slate-black or 

 purplish-black. Upper surface free from oblique corrugation, or with 

 it only weakly indicated in places. Base weakly sculptured with low 

 spiral cords. Axial callous white, or sometimes green-tinted and with 

 an orange outer border. 



Alt. 21, diam. 26 mm. (Kamoito, Teshio). 



Alt. 26, diam. 32 mm. (Afun, Teshio). 



Kamoito and Afun, Teshio, in Yesso, the types No. 80,388, 

 A. N. S. P., from the former place. 

 Clanculus hizenensis var. fraterculus n. v. PI. VI, fig. .54. 



The shell is trochiform with flattened base, straightly conic spire 

 and rounded periphery. On a nearly white ground it is radially macu- 

 late with browTi on the upper surface, with smaller spots interposed 

 between the others at the peripheral region. The base has paler small 

 spots on the ribs, sometimes partially arranged in radial stripes. The 

 apical H whorls are uniform, the next whorl irregularly dotted with 

 pink on a pale buff-brown ground. The 5 J or 6 whorls are convex and 

 parted by a narrow, deep suture. 



Trochus alfus Pern-, Conchologij, PI. 47, fig. 3 (ISll). 

 Trochus elotus Lamarck, An. sans Vert., VII, p. 21 (1822). 

 Trochus senatarius Philippi, Conchyl. Cab., Trochus, p. 324, PI. 46, fig. 7. 

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