INDEX 



615 



Hemiaspis, studies in, 118. 

 Hemipronites, 245. 

 Semisphcerocoryphe, 1.55, 156. 

 Hemithi/ris, 231, 24.5, 



adult brachia in, 282. 

 psittacea, adult brachia in, 282. 

 Henslow, G., cultivation of Acantho- 

 sicyos horrida. 74. 

 differentiation of parts of desert 



plants into spines, 74. 

 flora of arid regions, 71. 

 origin of xerophilous plants, 74. 

 spiny varieties of plants, 74. 

 Hindella, 245. 

 Hinnites, 23. 

 Hipparionyx, 245. 

 nippurites, hinge-line lost in, 236. 

 hoactzin, change in fore limb of, Lucas, 

 84. 

 of South America, thumb and in- 

 dex finger in, 84. 

 Holasaphus, 146. 

 Holmia, 113, 142, 143, 144. 

 facial sutures in, 143. 

 interocular spines of, 136. 

 Kjerulfi, 144. 

 pygidium in, 143. 

 retrally directed pleura of, 79. 

 Holocephalina, 146. 



position of eyes in, 147. 

 small eyes in, 147. 

 Solometopus, 133. 

 Somalonotus, 113, 133, 154. 

 DeKaijI, 134. 

 delphinocephalus, 134. 

 free-cheeks in, 124. 

 glabella and pygidium in, 155. 

 Knighti, 134. 

 Bomalopecten, 146. 

 Homalops, 156. 



accessory lobes in glabella of, 157. 

 Homarus, development of tail in, 83. 



spines in zoea of, 57. 

 Hommospira evax, 315, 351, 352, 356, 

 367. 



brachial supports in, 395. 



brachidium of, 284. 



circular apical perforation in, 



389. 

 deltidial plates in, 390. 

 discussion of, 360. 

 internal apparatus of, 365. 



loop in, 396. 

 sobrina, 315, 360. 



discussion of, 366. 

 plications in, 397. 

 sinus and fold in, 388. 

 Bomolichas, 150. 



glabella in, 150. 

 EoploUchas, 150, 151. 



extremes of spinosity in, 56. 

 glabella in, 150. 

 horn, definition of, 9. 

 horns, development of, in deer, 14. 

 in horned ungulates, 47. 

 in ox, 14, 21. 

 for protection and offence in hol- 

 low-horned mammals, 54. 

 in cattle of southern Italy, 53. 

 in ChamEeleontidaj, Darwin, 59. 

 in giraffe, 19. 

 in musk-ox, 53. 

 in Protoceras, Marsh, 58. 

 in Ruminata, 58. 

 in some Hercules beetles, Bateson, 



59. 

 in stag beetle, 60. 

 in Texas cattle, 53. 

 sexual variations of, 57, 

 variations in the directions of. 

 Marsh, 54. 

 horseshoe-crab, spines in, 22. 

 Huxley, T. H., Articulata and Inarticu- 



lata, 242. 

 Hyatt, A., AchatinelliE, 36. 



Baculites a, typical phylogerontic 



form, 91. 

 classification of stages of growth 



and decline, 247, 248. 

 development of fossil cephalopods, 



310. 

 early stages of ontogeny, 95. 

 entergogenic energy, 29. 

 evolution of Tertiary species of 



Planorbis at Steinheim, 65. 

 genesis of the ArietidaB, 247. 

 gerontic stages in Brachiopoda, 



398. 

 inherited characteristics, 100. 

 law of morphogenesis, 229. 

 nomenclature proposed by, 247. 

 pathologic distortions, 40, 

 pathological varieties of Steinheim 

 Planorbis, 91. 



