GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 115 



petalous fasciole is quite wide and is fairly well shown in areas II 

 and IV on the type-specimen and still better in one of the fragments, 

 which is a counterpart of the dorsal side of the same. 



One of the specimens, which is an external mould, shows the im- 

 press of the outline of the plates of part of a test, and gives measure- 

 ments of considerable interest. It measures about 50 mm. in length, 

 about 45 mm. in width, and about 38 mm. in height. From incom- 

 pleteness of the specimen no exact measurements can be given, yet 

 those available indicate a very high test. 



Locality and geologic occurrence. — Gatun formation, Miocene, 

 Panama Canal Zone. Second cut, south of Gatun R. R. Station, 

 Goldman Coll., U. S. National Museum station No. 7294, four speci- 

 mens. Holotype, U. S. Nat. Mus. Cat. No. 324461. Another speci- 

 men, imperfect and much worn, with a very high test, and appar- 

 ently referable to this species, is from Panama Canal Zone, Gatun, 

 section A, from middle of Bed " E," D. F. MacDonald, collector, U. S. 

 National Museum station No. 6008, one specimen. U. S. Nat. Mus. 

 Cat. No. 324462. 



DESCRIPTION OF PLATES. 



Plate 46. 



Fig. 1. Clypeaster lanceolatus Cotteau, dorsal view, natural size. The dark 

 spot in interambulacrum 5 is a yellow label that took black in the 

 photograph. : U. S. Nat. Mus., Oat. No. 324451, Station 58666. 

 2. Another specimen of the same, ventral view, natural size, U. S. Nat. 

 Mus. Cat. No. 324451, Station 58666. 



Plate 47. 



Fig. 1. Clypeaster gatuni Jackson, dorsal view. Holotype, slightly reduced, 

 U. S. Nat. Mus. Cat. No. 324453, Station 5662. 



Plate 48. 



Fig. 1. Clypeaster gatuni Jackson, ventral view ; same specimen as Plate 47. 

 Holotype, slightly reduced, U. S. Nat. Mus. Cat. No. 324452, Station 

 5662. 



Plate 49. 



Fig. 1. Encope annectans Jackson, dorsal view, natural size. Holotype, U. S. 

 Nat. Mus. Cat. No. 324454, Station 5846. 

 2. The same, ventral view. 



Plate 50. 



Fig. 1. Encope annectans Jackson, another specimen, external mould of ven- 

 tral side seen from above. Natural size, Paratype, U. S. Nat. Mus. 

 Cat. No. 324466, Station 5846. 



2. Schisaster panamensis Jackson, dorsal view, natural size. Holotype, 



U. S. Nat. Mus. Cat. No. 324461, Station 7294. 



3. The same, ventral view. The dark spot in interambulacrum 5 is a yel- 



low ticket that took black in the photograph. 



