

THE SESSILE BARNACLES. 357 



PLATE 72. 



FIGS. 1, la. Chthamalus challenged Hoek. Scutum and terguin. Matsushima. 



Page 307. 



2, 2a. Scutum and terguin. Ayukawa. 



3. Group growing on Tetraclita. Yokohama. 



4, 4a. Scutum and tergum. Japan, on Balanus cariosus. 



5, 5o. Chtliamalus malayensis. Malay Peninsula. Scutum and tergum. 



Page 310. 



6, 6a, 66. Chthamalus moro. Zainboanga, Mindanao. Group on Tetraclita 

 scabrosa. Scutum and tergum. Page 311. 



PLATE 73. 



FIGS. 1, 16. Chthamalus caudatus Pilsbry. Scutum, tergum, and top view of 

 the wall on the tergum of Mitella. Catbalonga, Samar. Cat. No. 

 4S087, U.S.N.M. Page 314. 



2. Chthamalus icithersi Pilsbry. Top view. Page 312. 



2a2d. Opercular valves of the type-specimen. 

 2e. Rostrolateral compartment, inside view. 



3-36. Chthamalus dalli Pilsbry. Top view, scutum and tergum. Una- 



laska. Cat. No. 480G9, U.S.N.M. Page 316. 



4, 4c. Chthamalus scabrosus Darwin. Scutum and tergum of a specimen 



from Valparaiso. Cat. No. 48089, U.S.N.M. Page 323. 



PLATE 74. 



FIGS. 1, 16. Chthamalus flssus Darwin. Scutum, tergum, and group on the 



shell of Mytilus calif orniamis, San Diego, California. Page 317. 



2, 2a. Chthamalus anisopoma Pilsbry. Left tergum and scutum of the 



type. Gulf of California. Page 317. 



26, 2c. Right scutum and tergum .of the same individual, drawn to the 



same scale as figs. 2, 2a. 



2d. Exterior of scutum of an unusually well-preserved individual. 

 2e. Carina, interior view. 

 2/. Part of the group, enlarged. 



PLATE 75. 



FIG. 1. Chthamalus imperatrix Pilsbry. Interior of rostrolateral com- 

 partment. Page 320. 

 la. Interior of lateral compartment. 

 16. Group, seated on a stone ; a nearly unworn individual in the lower 



median part. 



Ic, Id. Scutum and tergum, interior, 

 le. Carina, interior view. 



2. Chthamalus panamensis Pilsbry. Exterior of scutum. Page 319. 

 2o, 26. Two individuals of the typical lot. 



2c. Exterior of tergum. 

 2d, 2e. Interior of scutum and tergum of the type. 



PLATE 76. 

 Chthamalus hembeli Conrad. Page 324. 



FIGS. 1, la. Napili Harbor, Maui. Cirri and penis. 



2, 2a. Hilo, Hawaii. Tergum and scutum of right-hand specimen, fig. 26. 

 26. Pair of old specimens. 

 2c. Scutum and tergum united, inside view ; same specimen. 



4729 Bull. 9316 24 



