lilt 



CIRRIPKPIA. 



KIPEDIA, 



Ckaminipko, Darwin, 1854. Compartment* four, with tb suturvs 

 often much obliterated ; bull membranous. 



PaekyUuma, Darwin, 1854. Compartment*, when the thell U very 

 young, eight ; when maturer, either six, r in appearance only four, 

 from the close union of the lateral compartment* ; basis calcareous. 



Oelamtrit, Q. B. Sowerby, 1826. Compartment* eight ; radii with 

 their edge* crenated ; basis membranous. 



Octomtrii angvloia. 



a, the outiide ; below, an internal view of the ci(fht division* ; e, the anterior 

 piece ; d, the posterior piece ; t to *, the lateral pieces ; /, the opcrculum, 

 confuting of four pieces, of which the two anterior are the larger. 



Calophragmtu, O. B. Sowerby. Compartments eight, with several 

 exterior whorU of small supplemental compartments; basis either 

 membranous or calcareous. 



" The shell," says Mr. G. B. Sowerby, " consists in a number of 

 narrow perpendicular valves arranged around the shelly cone, and in 

 rows, like pales, the first row of which consists of eight pieces, placed 

 so as exactly to cover the sutures of the shelly cone immediately 

 surrounding the animal ; around this are then placed several sets of 

 more and more numerous pieces gradually decreasing in size, no that 

 the outer row, which is the most numerous, consists also of the 

 smallest pieces. Additional rows seem to be produced as the animal 

 increases in age ; for a young specimen in our possession has only 

 one row of eight pieces covering the sutures of the first cone, while a 

 much larger and older specimen still retains part of three rows, and 

 has evidently lost some of the external rows. The young individual 

 also shows that the whole of the pieces are pointed at their superior 

 extremities, whereas in the old shell these extremities are so worn or 

 eroded as to become very irregular and obtuse." 



a, the old ihell, natural six* ; , the same magnified ; 

 natural lUe ; d, the aame magnified. 



> the, young iheu, 



Family IL Vtmcida. 



Cirripedia without a peduncle ; scuta and terga not furnished with 



depressor muscle*, moveable only on one side, on the other side united 



immoveably with the rostrum and carina into an asymmetrical shell. 



Verruca, Schumacher, 1817 (C'luia and Clitia of Leach, t'mwm of 

 inarck, OcA/Aona of Runxani). This genus is very remarkable in 

 many respects, especially in its asymmetrical shell ; sometimes the 

 right side and sometime* the left side being specially modified. It 

 ucludes four recant species. 



Brfafa. 



Family lll.Ltpadida. 



Cirripedia baring a flexible peduncle, provided with muscles ; scuta 

 and terga (when present) not furnished with depressor muscles; 

 other valves (when present) not united into an immoveable ring. 



The genera of this umil v affix themselves by means of their peduncle 

 a submarine bodies, forming numerous groups. They art' 

 ound on floating substances far at sea : on ships, on logs of timU-r, 

 >n bottles, on net-corks, on fuci, on floating testaceous mollusks, 

 lantluna, for instance, and even on Home of the vertebrated 

 animals, on whales, turtles, and even serpents //v/. '/''". 

 "or example. Other testaceous mollusks might be mentioned, and 

 me species has been found parasitical within tin- mnl.rt.-lU of a 

 Mtdiaa. A large log of timber covered with these animals, tu 

 unl diverging in all directions, and so thick as entirely to hi<h tin' 

 surface of the log, is a strange sight. They look like an I'liormmw 

 collection of serpents to the ignorant; and we have heard a living 



as of this description casually thrown into shallow water and left 

 >y the tide so termed. Their growth must be extremely rapid. A 

 ship going out with a perfectly clean bottom will often return from a 

 short voyage covered with them below the wutcr lin.'. The Blacks of 

 roree are said to eat a large species of PcntalaimU, which is stated to 

 be delicate. 



Ltpat. -Valves 5, approximate ; cariua extending up. between the 

 terga, terminating downwards in an imbedded fork or in an external 

 Use; scuta subtriangular with their umbones at the rostral unulr. 

 The species are found all over the world attached to floating ol>; 



L. anatifera, the Common Barnacle. It is the Anal if a, Ann 

 and PcnJalatmi* of many authors. A nut if a engonata of Conrad ; 

 .t.d<Mi/a/a(var.)of Bruguicres; Pentalasmu dentaiut uf Broun; .1 

 f Martiu-Saint-Ange. The valves are smooth or delicately striated. 

 Might hand scutum alone furnished with an internal umboual tooth ; 

 uppermost part of peduncle dark -coloured. It is extremely common. 

 attached to floating timber, vessels, sea-weed, buttles, &o., an, I to 

 each other. 



m 



