THE CRUSTACEA OF XEW JERSEY. 143 



Key to the sub-families. 



a. Valves none to five ; when present umbones of scutum and carina median 



or above middle. alep.\din.e 



aa. V'alves three to five ; umbones of scutum at or near rostral angle ; carina 



with two ends unlike, umbo basal or below middle. lepadin.e 



Sub-Family Alepadin.?;. 



Plates vary from five, much reduced, to none. When present 

 umbones of scutum and carnia are median or above middle. 



Genus CONCHODERM A Olfers. 



Coiiclwderma Olfers, Ges. Naturf. Fr. Berlin, \'III, 1818. p. 177. Type Let^^ 



virgata Spengler, first species. 

 Otion Leach, Journ. Phys. Chim. H. Nat. Paris, LXXXV, 1817, p. 67. Type 



Otion blauivUlii Leach, first species. 



Nude cirripedes. Peduncle long. Capitulum generally 

 strij>ed or maculate, with two to five small vestigeal widely sep- 

 arated plates. Scutum at base of orifice two or three-lobed. 

 with umbo near middle in occludent border. Carina narrow, 

 arched, with two ends nearly alike, umbo near middle, some- 

 times wanting. Terga small, or in adults, sometimes wanting. 

 Lateral filaments numerous. Mandibles with five finely pec- 

 tinated teeth. ]\Iaxillae with distinct steps. Caudal appendages 

 none. Cirri with spines arranged comb-like. 



These barnacles are found attached to ship bottoms, sea tur- 

 tles, buoys and whales' "bonnets." Two species are known, 

 nearly distributed world-wide. 



Conchoderma virgata iSpengler). 



Pl.\te 39. 



Lepas virgata Spengler, Skrift. Naturh. Sclskabet., I. pt. i. 1790, p. 207, Pl. 6, 



fig. 9. Locality not giz'Ot. 

 Conchoderma z'irgata Darwin. Monogr. Cirrip., 185 1. p. 146, PI. 3. fig. 2, PI. 9, 



fig. 4. World-wide. 

 S. L Smith. Rep. U. S. F. Com., I, 1871-72 (1873), p. 580. All the 



