314 



BULLETIN 03^ 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. H. Withers, whose brilliant studies of 

 IMesozoic cirri])edes have materially extended our knowledge of the 

 l)hylogeny of the group. 



CHTHAMALUS CAUDATUS, new species. 



Plate 73, figs. 1, la, lb. 



Type.—Q'Ai. No. 48087, U.S.N.M. 



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

 mMella taken on the reef. Albatross Philippine expedition. 



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

 showing yellow lamina}; weakly ribbed near the margins; the radial 

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



Fig. 92. — Chthamalus caodatus. a, ciuuus vi and caudal appendage, the spines 



ARE OMITTED Fr.OM MOST OV THE SEGMENTS OF THE CIUUUS. J), MAXILLA. V, 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 boi-der. 



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



