256 



BULLETIN 93^ UNITED STATES NATIONAL MUSEUM. 



Fig. 81. — Tetraclita squamosa stalactifeea form conpinis. a, c, scuta and h, d, terga 



OF TWO INDIVIDUALS FROM ST. GeORGES ISLAND^ GULP OF CALIFORNIA. 



TETRACLITA SQUAMOSA PANAMENSIS, new subspecies. 

 Plate 60, figs. 3-3^. 



1909. Tetraclita porosa (Gmeliii) Pilsbry, Proc. U. S. Nat. IMus., voL 87, p. 

 64, pi. 16, fig. 2. 



Type.— C2ii. No. 58061, U.S.N.M., from Panama. 



Distribution. — Panama to Peru. 



Form, thich wall, small orifice and fine pores as in T. s. milleporosa, 

 the external color gray or tea green with light purplish-gray stains, 

 the sheath slate-violet to dusky slate- violet. Diameter 30 to 40 mm. 



Scutum, very similar to that ol' T. s. stoHactifera; often whitish in 

 the middle. Articular ridge and furrow narrow and small. Ad- 

 ductor ridge strongly developed, arcuate and long. 



Tergum decidedly narrower than in stalactlfera or tniUeporosa. 



I have seen a considerable number from Panama. While related to 

 T. s. miJlepoTOsa and T. s. stalaefifcra, it has a rather distinct aspect, 

 somewhat like typical T. squamosa. 



