14 BULLETIN 93, UNITED STATES NATIONAL MUSEUM. 



Suborder LEPADOMORPHA. 



Usually elongate and differentiated into capitulum and peduncle, the former pro- 

 tected by larger plates of specialized shapes, or sometimes all plates are wanting. 

 Mesozoic to Recent. 



Families: LORICUUD.E (Loricula, Archseolepas) , BRACHYLEPADID^E (if distinct 

 from SCALPELLID^E), SCALPELLID^E, LEPADID.E. 



Suborder VERRUCOMORPHA. 



Depressed, sessile, protected by an asymmetrical wall of four dissimilar plates 

 immovably articulated together- carina, rostrum, a tergum, and a scutum; some 

 lateral wall-plates are sometimes present on one side. The other tergum and scutum 

 form a movable lid closing the orifice. Mesozoic to Recent. 



Family: VERRUCID^E. 



Suborder BALANOMORPHA. 



Sessile, the wall bilaterally symmetrical, composed of carina, rostrum, and one to 

 three pairs of lateral compartments; opercular valves paired, furnished with depressor 

 muscles, or rarely wanting. Mesozoic to Recent. 



Families: CHTHAMALID^E, BALANIDJE. 



The first two suborders have hitherto been grouped together as 

 Cirripedia Pedunculata; the last two as Cirripedia Operculata or Ses- 

 silia, with the divisions Asymmetrica and Symmetrica. The Pedun- 

 culata and Operculata of recent authors are exactly equivalent to the 

 groups Campylosomata and Acamptosomata of Leach. 1 



DESCRIPTIONS OF GENERA AND SPECIES. 

 Suborder VERRUCOMORPHA. 



Family VERRUCID^E Darwin. 



1825. Clisiadse LEACH, Zoological Journal, vol. 2, p. 210. 



1854. Verrutidae DARWIN, Monograph on the subclass Cirripedia, etc., Balanidae, 



Verruoidee, etc., p. 495. 

 1914. Verrucida; WITHERS, Proc. Zool. Soc. London, p. 946. 



' 'Sessile, asymmetrical, boxlike barnacles, in which a scutum, ter- 

 gum, rostrum, and carina, with or without a rostral and a carinal 

 latus in addition, are immovably united to form the wall; the remain- 

 ing scutum and tergum are movable, and form the lidlike top" 

 (Withers). Basis membranous; caudal appendages present. La- 

 brum with a concave edge. 



Although the Verrucidse are grouped as sessile barnacles, they 

 have no near relationship with the Balanidse. The family comprises 

 two genera: Verruca Sowerby (see below) and Proverruca Withers, 

 a Lower Devonian genus, "in which a rostral and a carinal latus are 

 present on the rostrocarinal side, and in which none of the valves 

 has developed interlocking ribs." 2 



New light has been thrown on the phylogeny of Verrucidse by the 

 recent discovery of the Lower Devonian genus Proverruca and the 



> Zoological Journal, vol. 2, 1825, pp. 208, 209. 2 Proc. Zool. Soc. London, 1014, p. 94C. 



