1 00 Mr. Gray on the Genera of Cirripedes, XA v 0. 



*Bodi/ subcompressed ; shelli/ plates small, 

 Gen/l. Malacota, Schum, (n. 8.) 



Body club-shaped, with two cylindrical fleshy processes 

 behind, just above the posterior shelly plates. 

 M. bivalvis, Schum. Lepas aurita, Cuvier. 



2. Pamina, Gray. 



Body club-shapedf, with a cylindrical fleshy process behind, 

 between the posterior plates. 

 P. trilineata, Gray. Mits. Brit, 



3. Senoclita, Schum.(n,9), 



Body club-shaped, attenuated ; hinder part, simple. 

 S. fasciata, Sclium, Lepas membranacea, Montague. 



"^^Body compressed ; shelly plates large. 



4. OcTOLASMis, Gray. 



Body subcompressed ; shelly plates eight small, three lateral 

 pair and two dorsal ; the posterior valves linear ovate, with a notch 

 for the end of the linear ventral valve ; lateral central valve 

 triangular ; dorsal valves two, meeting at the angle of the back 



0. Warwickii, Gray. Heptalasmis Warwickii, Leach, MSS, ; 

 'but it has certainly eight valves. Mus. Brit. 



5. Anatifera, Lister (n. 1). 



Body compressed ; shelly plates, five, large, two pair lateral, 

 and one dorsal ; lateral valves subtriangular ; anterior pair very 

 large ; dorsal valve incurved. 



t Valves submembranaceous, dorsal one angulated, peduncle 

 short. Dosima, Gray. 



D. fascicularis. Gray. Lepas fascicularis, Montague. 



-ff Valves shelly y furrowed, dorsal one rounded, peduncle short, 



A. sulcata. Gray. Lepas sulcata, Montague. 



ttt Valves shelly, smooth ; dorsal one rounded; peduncle long. 



A. vulgaris. Lepas anatifera, Lin. 



Fam. II. PoLLiciPEDiD^, Gray. 



Body compressed; shelly valves distinct; peduncle coria- 

 ceous, covered with hair or shelly scales. 



*Shelhj valves smooth, placed one above the other. Living on 

 wood, or on other marine bodies. 



1. Scalpellum, Leach {n. 16). 



Shelly plates, 13. Lateral plates six pair, subtriangular ; 

 dorsal one, linear kneed ; peduncle annulatecl, with shelly scales. 



1. S. vulgare, Leach. Brit. Mus. 



2. Smilium, Leach, without character. 



Shelly plates, 13. Lateral plates five pair, subtriangular; 

 central and dorsal anterior plate, triangular, incurved ; dorsal 

 plate, linear, kneed ; peduncle pilose. 



S. Peronii, L*ach, MSS. Brit. Mus. 



