682 



INDEX. 



Penis, pubosciformed, of wonderful 



length in Cryptophialus, 58G. 

 Perforations in shell of A casta, 305. 

 Phyllosoina, affinities to cirripedes, 18. 

 Platylepas, genus, 424. 



bissexlobata, 428. 

 decorata, 429. 



cementing appa- 

 ratus of, 143. 



p?tlchra, 428. 

 Poecilasma Ksempferi, 499. 

 Pollicipes compared with sessile cirri- 

 pedes, 34, 41, 52. 

 Polglepas, genus, 397. 

 Polytrema, genus, 321. 

 Position of cirripedes, how acquired, 



127. 

 Potash, caustic, action on shell, 56. 

 Primordial valves, 129. 

 Prosoma, part of thorax, 67. 

 Proteolepas bivincta, 589. 

 Pupae of cirripedes, 110. 

 Pupa without natatory legs in Crypto- 

 phialus, 580. 

 Pyrgoma, genus, 354. 



Anglicum, 360. 



cancellatum, 362. 



conjugatum, 364. 



corymbosa, 374. 



crenatum, 370. 



dentatum, 369. 



grande, 365. 



lobata, 362 



niilleporse, 367. 



rnonticularise, 372. 



spongiarum, 374. 



stellata, 374. 



Stokesii, 361. 



sulcatum, 360, 492. 



wulata, 492 



Radii, structure of, 37, 45. 



remarkable, with outer lamina 

 of great thickness in Chelo- 

 nobia, 385. 

 compound in Coronula, 405. 



inXenobalanus, 441. 

 Rami of the cirri, their movements 

 and homologies, 71, 83. 

 modified in Alcippe into tritu- 

 rating organs, 542. 

 Range, geographical, of cirripedes, 159. 

 Rathke, on the position of the anus 

 in young Crustacea, 109. 

 on the cementing organs of 

 Crustacea, 151. 

 Rectum, 87. 



Reparation of injuries, 158. 

 Reproduction of cirripedes, 97. 

 Respiration of cirripedes, 64. 

 Rostrum, anterior compartment of 

 shell, 39. 

 not symmetrical in Chelono- 



bia caretta, 383. 

 compounded in Chelonobia, 

 386. 

 inPachylasma, 

 478, 481. 

 not quite medial in Platy- 

 lepas, 424. 

 Rules of nomenclature, 204. 



Sack, 61. 



muscles of, 62. 

 formation of, 124. 

 Sacks, acoustic, 95. 

 olfactory, 97 

 Savignium, genus, 354. 

 Scalpellum, sexes of, 23. 



vulgare, larvee of, 103 

 Schodler, on organs of hearing in 



Daplmia, 114. 

 Schumacher, date of memoir, 321. 

 Scuta, their structure, 51. 

 Scutum, with horny articular ridge 

 in Chelonobia, 388. 

 remarkable from great adduc- 

 tor ridge and occludent 

 ledge in Pyrgoma, 356. 

 fixed in Verruca, 502. 

 Sections, transverse, of shells of Bala- 



nidae, 39. 

 Segments of body in cirripedes, 111, 



125. 

 in Alcippe, 537. 

 in Cryptophialus, 

 571. 

 Senses of cirripedes, 94. 

 Septa, longitudinal, of the parietes, 



43. 

 Sexes of cirripedes, 23. 

 Sheath of shell, 38, 4S. 



peculiar in Tubicinella, 432. 

 remarkable in Chelonobia, 385. 

 Shell of a sessile cirripede compared 

 with the shell of the Lepa- 

 didte, 34, 41, 52. 

 of sessile cirripede compared 

 with the carapace of Crus- 

 tacea, 35. 

 elements of, 37. 

 sheath of, 38, 48. 

 orifice of, 38. 

 compartments of, 39, 43. 



