INDEX. 



683 



Shell, immediately after the metamor- 

 phosis, 41. 

 walls of, or parietes, 44. 

 radii of, 37, 45. 

 alse of, 37, 47. 

 basis of, 49, 

 operculum of, 50. 

 growth of, 54. 

 minute structure of, 57. 

 membranes of, 58. 

 sack of, 61. 

 with tubular perforations in 



Chameesipho, 473. 

 almost rudimentary in Xenoba- 



lanus, 441. 

 asymmetrical in Verruca, 499. 

 minute structure of, in Verruca, 

 506. 

 Shells of mollusca excavated by Ver- 

 ruca, 512. 

 excavated by Al- 

 cippe, 549. 

 Siebold, Von, on Syngamus trachealis, 

 23. 

 on the abdomen of cir- 



ripedes, 65. 

 on the cseca of the sto- 

 mach in Crustacea, 86. 

 on the vision of cirri- 

 pedes, 94. 

 on the acoustic organs 



of Crustacea, 97. 

 on the spermatozoa of 



cirripedes, 99, 

 on the eyes of cirripedes, 

 121. 

 Siphonicella, genus, 438. 

 Size of cirripedes in relation to tem- 

 perature, 162. 

 Sowerby, Mr. G. B., on the species of 

 Balani having cup-formed bases, in 

 the southern hemisphere, 192. 

 Sowerby, Mr. G. B., jun., on an inor- 

 ganic deposit in connexion with a 

 Pholas, 553. 

 Species, variability of, 155, 184, 197. 

 Spermatozoa, 98. 

 Spur of tergum, 52. 

 St. Ange, M. M., on the mouth of 



cirripedes, 19, 76. 

 on the reproduc- 

 tive system of 

 cirripedes, 97, 

 100. 

 on the nervous 

 system, 92. 

 Stomach, 85. 



Stomach, none in Proteolepas, 596. 



none in the male Alcippe and 

 Cryptophialus, 562, 585. 

 Stomapoda, affinities to cirripedes, 19. 

 Straus, on the affinities of cirripedes, 9. 

 on the moulting of Daphnia, 

 157. 

 Structure, microscopical, of shell, 57. 



peculiar in Ver- 

 ruca, 506. 

 Stutchbury, Mr., on the shell of Chelo- 



nobia, 386. 

 Syngamus trachealis, 23. 

 System, muscular, of the body and 

 cirri, 62, 68, 71, 76. ' 

 alimentary, 85. 

 circulatory, 87. 

 nervous, 88. 

 reproductive, 97. 



Temperature, effects of, on cirripedes, 



161. 

 Tetraclita, Genus, 321. 



coerulescens, 342. 

 costata, 339. 

 porosa, 328. 



upfilled parietal 

 tubes of, 44. 

 purpurascens, 337. 

 radiata, 343. 

 rosea, 335. 

 serrata,.333. 

 squamulosa, 329. 

 vitiata, 340. 

 Terga, their structure, 51. 

 Tergum, occludent ledge and shape 

 of, in Pyrgoma, 356. 

 fixed in Verruca, 503. 

 Testee valvse, 39, 43. 

 Testes, 97. 



development of, in Proteo- 

 lepas, 598. 

 Thoracica, order of, 21, 30. 

 Thorax of the Balanidae, 66. 

 of pupa, 85. 



rudimentary, in the male Al- 

 cippe, 562. 

 Tige of limbs, 83. 

 Triton of Linnaeus, 158. 

 Tubicinella, genus, 430. 



cementing apparatus of, 



143. 

 trachealis, 431. 

 balanarum, 431. 

 Lamarckii, 431. 

 major, 431. 

 maxima, 172, 438, 492. 



