220 MAZATLAN UNIVALVES 



antibus pictd ; aperturd elonyata, ohscnre trilobatd ; pagind 

 interna nitente, cinereo-alhicld, maculis externis plus minusve 

 monstrantilnts, callositate marginem versus ruhro-purpureo .- 

 cicatrice musculari irregulari, intus callosd, antice punctulatd ; 

 margine acuto, liaud crenulato, testa juniore castaneo punctato. 



Only two speeimens were found of tliis singular little sliell ; 

 the younger one of which, though the most highly coloiu'ed, 

 is diseased within, and displays neither the lurid colour of 

 the fsBcal caUus, 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, Eve. The external surface is 

 loose and rough. Long.'l, Z(f if. antice '3, postice "43, alt. '2^, 

 div. 105« by 80°. Hole • 14 by '04. 



Hah. — Mazatlan ; extremely rare ; L'pool Col. 



Tablet 1070 contains the larger specimen. 



Subgenus GLYPHIS. 



Animal iuarginc 2}aUii Ji mbriata. marginem testce superante. 



Testa superjicie cancellatd, margine crenulato, callositate 

 scepe truncatd, interdum laminatd ; testd juniore SimulceJ'ormi, 

 spird in aperturd crescenie ahsorp)td, 



Lucapina, H. Sf A. Ad. Gen. i. 4i7, (maxima pars) : non Gray. 



279. GlYPHIS INJEQUALIS, Soil). 



Fissurella insequalis, Sow. Proc. Zool. Soc. 1834, p. 126 : — 



Conch, m. no. 36, f. 45.— i?re. Conch. Ic. pi. 7, sp. 50. 

 Lucapina ina?qualis, S. Sf A. Ad. Gen. i. 447. 

 + Fissurella pica, Soio. Proc. Zool. Soc. loe. cit : — Conch. HI. 



no. 37, f. 32, et var. f. •3S.—Rre. Conch. Ic. pi. 7, sp. 49.— 



Mke. Zeit.f. Mai. 1847, p. 186, no. 39. 

 Lucapina pica, H. Sf A. Ad. Gen. i. 418. 



The extreme forms of this species are very dissimilar : the 

 one being very ina^(|uilateral, with a long narrow trilobed slit, 

 and sharply truncated liicuspid callus within : the other sub- 

 a^quilateral with a nearly circular hole, and the callus not 

 truncated. The specimens with an oval hole are F. pica. Sow. 

 and the suba;quilateral form is figured in the Couch. III. as 

 F. pica, var. B(H\\ een the extremes, there is every gradation, 



