356 BULLETIN 93, UNITED STATES NATIONAL MUSEUM. 



Plate 67. 



Figs. 1-1 b. Platylcpas hctcastylos. Delaware Bay. Top, profile, and basal 

 views, the basis removed. raj:e2S.5. 



Ic. r. hcxasti/los. r.asal view of one of the same lot, the basis in 

 place. 



2. P. h. ichthiiophila Pilsbry. Rostrum of type. Page 287. 



3. P. hexnfitylofi. Osprey, Florida. Typical Rostrocarinal diam- 



eter of largest specimen, 17 mm. Page 286. 



4. P. hexastylos, variety. Sicily. Diameter, 8..5 mm. Page 287. 



Plate 68. 



Figs. 1-15. F^tomatolcpas prwr/ustator Pilsbry. Dry Tortugas, Florida. 



Type. Upper, lateral, and basal views. Page 289. 



2,2(1. Stomatolepas elegans (O. G. Costa). Photographic copies from 



Costa's plate. Page 289. 



3-3&. Cylinrl role pas darwiiiinna Pilsbry. Type. Inside of rostnmi ; 



lateral and top views. Page 288. 



Plate 69. 



Hexelasma americnnum Pilsbry. Page 330. 



Figs. 1-lg. Opercular valves, penis, and Ihree views of the walls of the type. 

 2. Carina of another specimen. 

 3-8&. Carina, lateral compartment, and rostrum of other specimens. 



Plate 70. 

 Chthamalus frayilis Darwin. Page 297. 



Figs, la, Ih. Clearwater Harbor, Florida. Dorsal and lateral views of speci- 

 men which grew on a reed. 

 Ic, 1(/. Scutum and tergum of same. 



2. Ocean City. New Jersey. Dorsal view of specimen taken from a 

 Balaniis balanoidcs. 

 3-oC. A'aradero Beach, Cuba. Opercular valves and group growing on 

 an oyster. 

 4. Clearwater Harbor, Florida. Part of a group on a reed. 



Plate 71. 



Figs. 1, lb. Chthamaltts stcJlalus (Poll). Scutum, tergimi, and a gi-oup of cor- 

 roded specimens on a stone, enlarged. Naples. Page 302. 

 2, 2a, 21). Scutum, tergum and a group of tuljular .specimens. England. 

 3, 3a. Two conic individuals from Exmouth. 



4, 4ff. Scutum and group of specimens on a living Thais hwinastonia. 

 Fayal, Azores. 

 5, 5fl, 5?). Chthamalus stcUatus angusiitcty/nni Pilsbry. Group of sis speci- 

 mens of different ages, X 3 ; scutum and tergum. Bahamas. 



Page 305. 



6,6a. Chtliamaliis stcUatus bisinuatus Pilsbry. Scutum and tergum of 



the type. Santa Catharina Island, Brazil. Page 306. 



