236 



CLASS THIRD. 



CIRRIPEDA; OR, BARNACLES. 



Tlio auimaU are soft, Jestitute of a head, and consequontlv 

 eyes; covered with a shell, and are incapable of locomotion, 

 bcini; always aflixeil to extraneous bodies. The whole of tlic 

 Cirripedes are niultivalvc — that is, consisting of more than 

 two pieces or valves. 



ORDER I.— rEDUNCULATA. 



Bodj supported on a tubular, membranaceous, nios'eable 

 peduncle, the base of which is affi.\ed to stones and other 

 marine bodies, or timber floating in the ocean. 



Genus I.— POLLICIPES.— Zea<?/<. 



Body covered by a shell, and supported by a tubular, ton- 

 dinous, squamifcrous peduncle, which seldom exceeds two 

 inches in length ; shell multivalvo, compressed on the sides, 

 with the valves nearly contiguous and unequal ; valves thir- 

 teen or more in number, those on the sides smallest ; five 

 upper valves much larger than the others, the anterior pair 

 conical, elongated, with their sides reflected backwards, situate 

 on each side of the opening ; the central or terminal |>air 

 largest, and trapeziform, with an acute angle at the posterior 

 extremity ; dorsal valve greatly elongated, broad at the base, 

 rounded on the back, with on acute apex ; between these, in 

 the peduncle, are a number of smaller, testaceous, generally 

 triangular studs. — P<jl/icipe» ConiMopia, pi. XCVII. fig. 12. 



1. P<ii.i,iciPKs uiGiuus.— The Rigid PoUicipes, pi. XCVII. 

 figs. 7, «, 9. 



P. rigidut. Sowerby, Geo. Tr. 2d Ser. IV. p. 335, pi. 11, 

 fig. 6*. 



Posterior valves furnished with thin, transverse, very pro- 

 minent elexalions ; lateral valves somewhat elongated. 



Tbo Gault, Fulkstone. 



2. PoLLicii-Es L^viM.— The Smooth Pollicipcs, pi. XCVII. 

 figs. 1!) to 2i. 



P. lairu. Sowerby, fico. Tr. 2d Ser. IV. p. .3.'?5, jd. 11, f. 5. 

 lateral valves rhoniboidal, smooth, thin, ami almost flat. 

 Tho fiault, Folkstono, and the Grecnsand, Itlackdown. 



3. Poi,i,icii-E8 L-.Nouis. — The Claw Pollicipcs, pi. XCVII. 

 figfi. 4, r,, r,. 



P. Htigiii,. Sowerby, Geo. Tr. 2d Ser. IV. p. 33.';,pl. 11, f.C*. 

 » alvca all remarkably curved, broad in proportion to their 

 lont'th, and smooth. 

 The (lault, Kolkstone. 



4. PoLLicii-ts HADIATL'S. — The Radiated Pollicipcs, pi. 

 XCVII. figM 0,11. 



P. radiatus. Sowerby, Geo. Tr. 2d Ser. IV. p. 33."., i)l. II , f. C. 

 Valves wedge-shaped, flat, with sharp, elevated rays diverg- 

 ing from their apices. 



The Lower Greensand, near Lynipne, Kent. 



5. PoLLiciPES ANTidUUs. — The Ancient Pollicipcs, pi. 

 XCVII. fig. 5. 



P. (?) Sowerby, Geo. Tr. 2d Ser. V. p. ]3(;, pi. VIII. 

 figs. 34-3G. 



Posterior valves long, curved, narrow, and striated trans- 

 versely ; lateral valve obliquely sub-(juadrate ; stria) triangu- 

 lar. 



The London Clay, Highgate. 



6. PoLLiciPEs MiNUTOS. — The Minute Pollicipcs, pi. 

 XCVII. figs. 3G to 45. 



P. (?) Sowerby, Goo. Trans. 2d Ser. V. p. 136, pi. 9, f. 2. 

 Posterior valves elongated and straight ; lateral valves 

 triangular, with waved stria'. 

 Tho London Clay, Hampstead. 



7. PoLLiciPES MAXi.MLs. — Tlio Large Pollicipcs, pi. 

 XCVII. figs. 17, 18. 



P. maximits. Sowerby, VI. p. 222, pi. COfi, figs. 3-G. 



Terminal valves plain and rhomboidal, sometimes with a 

 central ridge and lines of growth ; posterior valve lanceolate, 

 much elongated, and arcuated; posterior valve, figs. 13 and 

 18, terminal ; valve 17, anterior valve. 



In the Chalk, Northfleet and Norwich. 



8. PoLLiciPEs REFLEXi.s. — The Reflected Pollicipcs, pi. 

 XCVII. figs. 25 to 33. 



P. rctlcvus. Sowerby, VI. p. 222, pi. GOG, fig. 8. 



Posterior valve lanceolate, straight, or recurved ; lateral 

 valves almost flat and smooth. 



Upper JLirino Formation, Colwell Ray, Isle of Wight. 



0. PoLLU'iPES siLCATUs. — The Furrowcd Pollici]ies, pi. 

 XCVII. fig. 12, 13. 



P. sulcatiu. Sowerby, VI. p. 221, pi. COC, figs. 1, 2, and 7. 



Valves with longitudinal, elevated striae ; the terminal 

 valve, fig. 2, elongateil and rhomboidal ; posterior valves, 1 

 and 3, are acuminated, broad, lanceolate, and somewhat car- 

 inated ; both arc furnished with irregular, sharp, elevated, 

 longitudinal striio. 



In the Chalk, Lewis and Norwich. 



ORDER II.— SESSILIA. 



Destitute of a ])eduncle ; body enclosed in a mnltivalve 

 shell, attachcil by its base to marine bodies ; mouth situated 

 at the upper and interior portion of the body. 



