GLYPHIS. 225 



Several specimens of this apparently distinct form are before me. 

 It is far more elongated than G. gibberula or G. arcuata, and more 

 depressed. In contour G. minuta is near to this form, but the 

 orifice of that species is very much shorter. 



G. CRUCIATA Gould. PL 42, figs. 66, 67, 68, 69. 



Shell minute, thin, shining, elongated-ovate, somewhat arched, 

 rounded at extremities, apex elevated at the anterior third, with a 

 key-hole perforation slightly contracted at the sides. Surface 

 sculptured with about thirty elevated, rounded, radiating ribs, for 

 the most part alternately larger and smaller. These are crossed by 

 concentric series of regularly and closely arranged elevated threads, 

 which are slightly imbricated, giving the surface a beautifully 

 cancellated appearance. Colors black and white, arranged so that 

 radiating patches of black corrrespond to the two diameters, and of 

 white to the two diagonals, the latter not continued to the margin. 

 Edge very finely crenulated. Interior white and shining, but blue 

 at the parts that correspond to the black of the exterior. A thick 

 callus fortifies the perforation. Length two-fifths, breadth one- 

 fourth, alt. one-eighth inch. (G7d.) 



Sooloo Sea. 



F. cruciata GOULD; Proc. Bost. Soc. N. H. 1846, p. 155; U. S. 

 Expl. Exped. Sh., p. 365, f. 474. 



G. TICAONICA Reeve. PL 36, fig. 20. 



Shell ovate, gibbously elevated, anteriorly much inclined, slightly 

 hooked; thickly latticed throughout with strong narrow radiating 

 ridges and raised concentric striae ; orifice elongately oblong, sides 

 excavated in the middle ; greenish-white sprinkled with dots and 

 blotches of olive-green, bluish around the orifice. An extremely 

 characteristic species, much elevated and curved anteriorly, with 

 the same narrow oblong fissure mostly seen in the flat species. 

 (Jto.) 



Ticao, Philippines, under stones at low water. 



F. ticaonica RVE., Conch. Icon. f. 107. SOWB., Thes. p. 197, 

 f. 110. 



G. CRUCIFERA Pilsbry. PL 32, figs. 27, 28, 29, 30, 31. 



The shell is regularly elliptical, little elevated, the slopes straight ; 

 the 40-45 radiating riblets are equidistant, elevated, narrow and 

 sharp, and are crossed by 12-15 concentric threads of equal 

 15 



