220 MAZATLAN UNIVALVES 
antibus pictt ; apertura elongata, obscure trilobata ; pagina 
interna nitente, cinereo-albidd, maculis externis plus minusve 
monstrantibus, callositate marginem versus rubro-purpureo : 
cicatrice musculari irregulari, intus callosd, antice punctulata ; 
margine acuto, haud crenulato, testé juniore castaneo punctato. 
Only two specimens were found of this singular little shell ; 
the younger one of which, though the most highly coloured, 
is diseased within, and displays neither the lurid colour of 
the fecal callus, nor the punctures on the anterior part of 
the general callosity which fills up the space between the 
irregularly jagged muscular scar and the region of the hole. 
It most resembles F. catillus, Rve. The external surface is 
loose andrough. Long. °7, lat. antice °3, postice *43, alt. °24, 
dav. 105° by 80°. Hole °14 by *04. 
Hab.—Mazatlan ; extremely rare; L’pool Col. 
Tablet 1070 contains the larger specimen. 
Suseenus GLYPHIS. 
Animal margine pallii fimbriata, marginem teste superante. 
Testa superficie cancellatd, margine crenulato, callositate 
A = . . A Ais . . . 
sepe truncata, interdum laminaté ; testa guniore Rimuleforme, 
spird in apertura crescente absorptd. 
Lucapina, H. § A. Ad. Gen. i. 447, (maxima pars): non Gray. 
279. GLYPHIS INEQUALIS, Sow. 
Fissurella inequalis, Sow. Proc. Zool. Soc. 1834, p. 126 :— 
Conch. Til. no. 36, f. 45.—Rve. Conch. Ic. pl. 7, sp. 50. 
Lucapina inequalis, H. & A. Ad. Gen. 1. 447. : 
+Fissurella pica, Sow. Proc. Zool. Soc. loc. cit:— Conch. Ll. 
no. 37, f. 32, et var. f. 33.—Rve. Conch. Ic. pl. 7, sp. 49.— 
Mke. Zeit. f. Mal. 1847, p. 186, no. 39. 
Lucapina pica, H. & A. Ad. Gen. 1. 448. 
The extreme forms of this species are very dissimilar: the 
one being very inequilateral, with a long narrow trilobed slit, 
and sharply truncated bicuspid callus within: the other sub- 
equilateral with a nearly circular hole, and the callus not 
truncated. The specimens with an oval hole are F. pica, Sow. 
and the subequilateral form is figured in the Conch. Ill. as 
F. pica, var. Between the extremes, there is every gradation, 
