72 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.37. 



CHTHAMALUS SCABROSUS Darwin. 



1854. Chthamalns scabrosu.s L).\r\vin, Monograph on the CirriptMli.i, Balan- 

 ida>; p. -iUS. pi. ]<), fig. 2. 



Locality. — Peru to Falkland Islands (Darwin). 

 The barnacle is dull jjurplish brown when weW preserved, dirty 

 gray when eroded; surface generally rugged. 



Aeeordhig to Darwin the opercular plates generally have llieir summits much 

 worn down. The scuta are elongated in the line of the longer axis of the orifice ; 

 the articular ridge is very prominent, and is placed in the middle of the tergal 

 margin. The terga are very narrow; they are remarkable in two respects, 

 namely, in the depressor muscle being attached to a plate formed apparently by 

 the union of the usual crests, parallel to the outer lamina of the valve itself, 

 a deep narrow cavity being thus formed; and secondly, in the far more extraor- 

 dinary circumstance of the existence of a small pit at the extreme basi-scutal 

 corner of the valve, in which about half of the scutal lateral depressor muscle is 

 attached. 



No definite locality in Peru has been recorded. 



Family VERKUCID.^ Darwin. 



Genus VERRUCA Schuniacher. 



Sessile, box-like cirripedes, Avith u shell composed of six plates. 

 Scuta and terga without depressor muscles, movable only on one 

 side, on the other immovably united with the rostrum and carina into 

 an asymmetrical shell. 



VERRUCA L.ffi:VIGATA (Sowerby). 



71826. CUlia lavigata Sowerby, Genera of Recent and Fossil Shells, figs. 1. 8. 

 1854. Tenuca lavigata Sowerby. Darwin, ;Monograph on the Cirripedia, 

 Balanidae, p. 520, pi. 21, fig. 3. 



Locality. — Tierra del Fuego to Peru, attached to shells and to Ba- 

 lanus (Darwin). Tumbez (Weltner). 



Family SCALPELLID.^. 



• Genus MITELLA Oken. 



Valves of the capitulum from 18 to over 100 in number, all with the 

 umbones apical above; latera of the lower whorl numerous. A sub- 

 rostrum always present. Peduncle closely scaly. These barnacles 

 live attached to fixed, or rarely, floating objects. 



MITELLA ELEGANS (Lesson). 



1831. rollicipes <h'ganfi Lesson, Yoy. autour du Monde de "la Coquille" 

 Zoologie, pi. 2. p. 441 ; Illustrations Zoologitjnes. iil. 30. 



1851. /'. clegans Lesson, Darwin, Monograph on the Cirrlpe<lia, Lepadidae, 

 p. 304. 



Locality. — Payta, on piles (Lesson) ; Lobos Island (Cuming). 



I 



