24 BULLETIN 93_, UNITED STATES NATIONAL MUSEUM. 



Conia monstruosa O. G. Costa/ is evidently a Verruca of the 

 Italian Tertiary, which has not been noticed by any subsequent 

 author, to my knowledge. 



VERRUCA STROMIA (O. F. MuUer). 



1776. Lepas strdmia O. F. Muller, Zoologise Danicse Prodromus, p. 251. 



1789. Lepas strdmia Muller, Zoologica Dauica, vol. 3, p. 21, pi. 94, figs. 1, 2, 3, 4. 



1790. Lepas verruca Spenglek, Skrivter af Natuxliistoric-Selskabet, vol. 1, p. 194. 

 1854. Verruca strdmia Muller, Darwin, Monograph, etc., p. 518, pi. 21, figs. 



la-f {q. V. for synonyms and older references). 

 1897. Verruca strdmia Muller, Weltner, Verzeiclinia der bisher beschriebenen 



recenten Clrripedicnarten, Archiv f. Naturg., vol. 1, p. 274. 

 1900. Verruca strocmia Miiller, Weltner, Fauna Arctica, vol. 1, pp. 298, 303-4 



(entrance to White Sea). 



Type-locality. — North Sea. 



Distribution. — Shores of northern Europe north to Iceland and 

 Greenland, south to England and Helgoland; low tide to 90 fathoms. 

 Pliocene and Pleistocene of Great Britain; ?Rcd Sea. 



Specimens in the United States National Museum are from Scar- 

 borough, on Pecten, Exmouth, south Devon, on sandstone, v/ith 

 Balanus spongicola, and the Irish Chamiel, on Chrysodomus antiquus 

 and Balanus hameri, all from the Jeffreys collection. There are 

 also numerous examples without definite locality, and one lot from 

 the British Crag, Jeffreys collection. I have looked over a good 

 many shells and barnacles from Greenland without fuiding Verruca. 



This common European species is light brown, much depressed, 

 with the walls broadly spreaduig; rostrum is much the largest plate. 

 Movable scutum and tergum are very small, especially the scutum, 

 both having three articular ribs. The sculpture of fuie, crowded 

 growth Imes, is quite milike any deep-water species. Carina, ros- 

 trum, and fixed scutum mterlock by many subequal ribs, but the 

 suture between fixed scutum and tergum is straight and linear. 

 Inside there is a very largo adductor ridge or myophore, in form of a 

 flat, downwardly slopmg plate in the fixed scutum. In the fixed ter- 

 gum there is a similar plate. Sometimes these plates stand almost 

 vertically, partitioning off the cavities of fixed scutum and tergum. 

 Often the apex of the rosti-um also is excavated. The contour is 

 rounded when the barnacle stands alone, but they are often crowded, 

 like Balani, producing curious irregularities of shape. Well-grown 

 English examples measure about 8 or 9 mm. in greatest diameter 

 and 2 to 3 mm. high. 



Accordmg to Darwin the rami of cirrus i are shghtly unequal. In 

 cirrus ii the posterior ramus is more than twice as long as the anterior. 

 Cirrus iii is like ii. Termmal appendages are two-thirds to four- 



> Dialcuni Balanidi appartenentl al Regno di Napoli, m Atti Accad. Sci. Napoli, vol. 5, pt. 2, 1843, 

 p. 117, pi. 1, figs. -1, 5, 0, republished aa Creusia monstruosa Costa, Fauna del Kegnl Napoli, Cirropedi 



p. 2;^. 



