1905.] NATURAL SCIENCES OF PHILADELPHIA. 115 



ovate, the lip thin and simple. The umbilicus is nearly filled by a cal- 

 lous mass ending in a flattened, pink lobe, reducing the umbilicus to a 

 narrow semicircular cavity, which is bounded by a rounded, overhang- 

 ing cord ending in a flattened callous at the lip. 



Alt. 11, diam. 17 mm. 



Hirado, Hizen. Type No. 88,313, A. N. S. P., from No. 1,526 of 

 Mr. Hirasc's collection. 



Distinguished by its narrowly crescentic umbilical cavity, in which 

 a very large spiral pillar stands, terminating in the callous pad, and 

 nearly filling the umbilicus. In sanguinea the callous is red and com- 

 pletely fills the umbilicus in both half-grown and adult shells — or at 

 least this is the case with the type lot. 



The whole shell is more depressed than the specimens of E. g. mon- 

 trouzieri before me, in which, moreover, the callous is white. 



Fischer's figure of E. callosa {Trochns callosus) differs by its semi- 

 circular callous nearly surrounding a subcircular umbilicus. 



Ethalia striolata A. Ad. and E. trilohata Sowb. have much the struc- 

 ture of selenomphala, but differ in the shape of the callous. 



ETHALIELLA n. gen. 



Depressed, openly umbilicated, smoothish Trochidce, with the peris- 

 tome obtuse, the columellar margin dilated, partly vaulting over the 

 umbilicus, which is radially sulcate within and has a very low, wide 

 and rounded marginal cord. Type E. floccata. Distribution, Indo- 

 Pacific. 



This group is to comprise species related to Monilea, Ethalia and 

 Isanda, but with features of the columellar lip and umbilicus unlike 

 either. Minolta and its boreal ally Solariella differ by the almost or 

 quite unexpanded columellar margin. 



The group will include, besides the type, Ethalia rhodomphala Smith, 

 Isanda pulchella A. Ad., and Trochus rhodomphalus Souv. 

 Ethaliella floooata Sowb. PI. IV, figs. 24, 25, 26. 

 Ann. Mag. Xat. Hist., XII, 1903, p. .500. 



Shell much depressed, biconvex, obtusely carinate peripherally, 

 openly umbilicate. Flesh-tinted, with a band below the suture com- 

 posed of fine obliquely radial dark red lines alternating with white 

 ones. This is followed in the middle of the upper surface by a spiral 

 series of oblique, oblong red blotches alternating with opaque white 

 ones. Below these there is a minutely white-speckled belt, and then 

 at the periphery a series of red spots. On the base, the umbilicus is 

 fleshy-whitish ; outside of this there is a red area closely mottled with 



