314 



BULLETIN 93, UNITED STATES NATIONAL MUSEUM. 



most of the species, and the small number of spines on the posterior 

 cirri is noteworthy. 



Named in honor of Mr. T. PI. Withers, whose brilliant studies of 

 Mesozoic cirripedes have materially extended our knowledge of the 

 phylogeny of the group. 



CHTHAMALUS CAUDATUS, new species. 



Plate 73, figs. 1, la, Ib. 



Type. Cut. No. 48087, U.S.N.M. 



Locality. Catbalonga, Samar, Philippines, on terga of Mitella 

 mitella taken on the reef. Albatross Philippine expedition. 



The barnacle is rather narrow, oblong, corroded, gray, in places 

 showing yellow laminae ; weakly ribbed near the margins ; the radial 

 borders zigzag where not too deeply eroded. The orifice is ovate. 



FIG. 92. CHTHAMALUS CADDATDS. a, CIRRUS vi AND CAUDAL APPENDAGE. THE SPINES 



ARE OMITTED FROM MOST OF THE SEGMENTS OF THE CIRRUS. b, MAXILLA. C, MANDIBLE. 



Carinorostral diameter, 10 mm.; lateral diameter, G mm.; height, 

 2.7 mm. 



The scutum has a rounded articular ridge, most prominent in the 

 middle, sloping downward. No adductor ridge; adductor muscle 

 pit shallow. A rather strong ledge along the occludent border. 



The tergum is rather narrow in the lower half, not very wide above. 



