1 825 J ai ranged in Natural Families, l05 



V, Stromii, Schum, Balanus striatus, Pen, Brit, ZooL 

 Clisia striata, Leach. Creusia Stroinia ? and C. verruca, Lam, 

 Hist. 



Fam.V. Co Ro Nu LI D^, Gray. 



Body, conical, or cylindrical ; six-valved ; valves, cellular ; oper* 

 culuin, four-valved, horizontal ; valves imbedded in the tunic 

 (not articulated) ; base none, or membranaceous. Imbedded in 

 or attached to the organic parts of sea animals, as whales, turtles, 

 crabs. 



1. TuBiciNELLA, Lam, (n, 7), 



Body cylindrical, or front rather contracted; operculum, 

 valves equal. 



T. trachealis. Lam, 



2. PoLYLEPAs, Klein (n, 4), 



Body subdepressed. Mouth nearly circular; valves very 

 thick, outside lobed, inside many cells ; operculum, posterior 

 valves largest. 



tDiadema, Schum, Convex, front of the cavity contracted, 



P. D. Kleinii, Gray. P. Balaenaris, Klein, tepas Diadema, 

 Lin. 



tfCetopirus, Ranz. Depressed, front of the cavity scarcely 

 contracted. 



P. C. vulgaris, Gray. Coronula Balaenaris, Lam, 



3. Platylepas, Gray. Coronula, Ranz. part Lam, 

 Body depressed. Mouth ovate. Valves, outside two-lobed; 



inside celled, midribbed; operculum, valves nearly equal. 



P. pulchra, Gray. Shelly valves finely transversely striated ; 

 sutures smooth, Corsica. Mas. Brit. Chelonobia, species. Leach, 

 C. bisexloba, Ranz. 



This genus is very interesting, as being exactly intermediate 

 between Polylepas and Astrolepas : it has the cells of the former, 

 and the form and operculum of the latter. 



4. Astrolepas, Klein (n. 5). 



Body depressed. Mouth six-sided. Valves thick, subsolid, 

 base toothed, rugose ; operculum, valves equal. 



1. A. Testudinaria,Gray. Shellyvalves, radiately substriated; 

 sutures, distinct, simple. Balanus Testudinaria, Lin. Coro- 

 nula Testudinaria, Lam. 



2. A. rotundarius, Gray. Shelly valves, smooth : sutures, wide, 

 transversely pitted. Balanus rotundarius, Lin. A. Testudina- 

 ria, Klein. 



3. A, Uzvis, Gray, Shelly valves, smooth ; sutures distinct, 

 simple. 



Coronula denticula, Say ; foutid on the clypeus of the King; 



