THE CRUSTACEA OF NEW JERSEY. 143 



Key to the sub-families. 



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



or above middle. alepadin^ 



CO. Valves three to five; umbones of scutum at or near rostral angle; carina 



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



Suh-Family AlEpadin^. 



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

 umbones of scutum and carnia are median or above middle. 



Genus CONCHODERMA Olfers. 



Conchoderma Olfers, Ges. Naturf. Fr. Berlin, VIII, 1818, p. 177. Type Lepas 



virgata Spengler, first species. 

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



Otion blainz'illii Leach, first species. 



Nude cirripedes. Peduncle long. Capitulum generally 

 striped 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. Maxillae 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 (Spengler). 



Plate 39- 



Lepas virgata Spengler, Skrift. Naturh. Selskabet., I, pt- i, 1790, p. 207, PI. 6, 



fig. 9. Locality not given. 

 Conchoderma virgata Darwin, Monogr. Cirrip., 1851, p. 146, PI. 3. fig. 2, PI. 9, 



fig. 4. World-wide. 

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



seas. 



