I iidi X. 



Mniotiltidae, white markings of 



305. 



Moll, .1. W., cited, 168, 172. 



Monticelli, F. S., cited. 359, 360 

 361, 376. ill, 412. 



Morphological observations oi 

 Salpa chain, 149. 



Morphology, current terms in, si 



Morphology and life history of 

 Trypanosoma dimorphon 

 1 30. 



Movements, of Gyrocotyle, 123, 



Mud-fish, California, 6. 



Muscles, of Gj rocotyle, 385, 390 

 finer structure of, 393. 



Musculature of acetabular re- 

 gion, in Gyrocotyle, 391. 



Mussels. 91. 



Mutation, 88. 



Naples Zoological Station, ac- 

 knowledgment to, 185. 



Nature, variety, but persistency 

 of organisms in, 88. 



Neetophiurae, 41. 



Nervous system, of Gyrocotyle, 

 409; staining of. 3S4; peri- 

 pheral. 410; central, 411, 

 41:!; acetabular, 412; gang- 

 lion cells, 416. 



Obelia, 20. 

 purpurea, 20. 



Ocean Water, dynamical theory 

 of motion of, 199. 



Oceanic circulation, Ekman's 

 theory. 199. 



Offspring, resemblance to parent, 

 83. 



Oligodontida, 41. 



Onehocalanus latus, 314, 326. 



Ooecial aperture, of Cyclosto- 

 mata, 227. 



Ooecial internode of Crisia, na- 

 ture of the branching, 230; 

 position of the ovieell, 230; 

 positions of the branches, 

 230. 



Ooeciopore, opening of tube of 

 ooeciostome of Cyclostomata, 



Ooeciostome, of Cyclostomata. 227; 



ooeciopore of, 227 ; tube of, 



227. 

 Ooecium, septum of, 234; its 



function. 235. 

 Oogenesis, in Gyrocotyle. 401. 

 Operculum of Crisia operculata. 



241. 

 Ophiacantha, 48. 



normani, 48, plate 3. 



Ophiactis. 42. 



arenosa. 42. plate 3. 

 Ophiocnida, 45. 



amphacantha. 40, plate 1. 

 hispida, 46, plate 6. 

 Ophiocomidae, 19. 

 Ophiocten, 40. 



pacificum, 40. 

 Ophioderma. 34. 



panamensis, 35. 

 ( Iphiodermal idae, 34. 

 Ophioglypha, 37. 

 i iphiolepididae, 35. 

 Ophiolepis, 37. 

 Ophiomusium, 35. 

 jolliensis, 30. 

 lyinani, 36. 

 Ophionereis, 47. 

 anuulata, 47. 

 Ophiopholis, 41. 



bakeri. 41. 

 Ophioplocus, 39. 



esmarki, 39. 

 Ophiopteris, 49. 

 papillosa, 49. 

 Ophiothrix, 50. 

 rudis. 51 . 

 spiculata, 50. 

 Ophiura, 37. 

 kofoidi. 38. 

 lutkeni, 37. 

 Ophiurans, The, of the San Diego 

 Region, 33; bibliography. 

 52. 

 Ophiurodea, 34. 



Orbigny. A. d ', cited. 23s, 267. 

 Orderliness, in Haloeynthia john- 



soni. 85. 

 Organic system, diminution of 



activity in. 87. 

 Organism, "as a whole," 4; de- 

 velopment of. 3; and en- 

 vironments, 89, on. 94; 

 meristic constitution of, 

 so. 

 Orientation, in Gyrocotyle, 418, 

 421. 423; functional, 424, 

 431. 

 Ornithocercus, 185. 

 Ova. of Cyclostomata. 227. 

 Ovaries, in Gyrocotyle, 395. 

 Ovieell, cyclostomatous, descrip- 

 tion of. 226. 

 Ovieells of Cyclostomata, 225. 

 Ovum, in Gyrocotyle. 461, 403; 



clevage of, 406. 

 Papillae, in Salpa chains, 155. 

 Paraugaptilus buchani, 314, 335. 

 Parent, resemblance of offspring 

 to, 83. 



I i--< I 



