28 THE VOYAGE OF H.M.S. CHALLENGER. 



11. Collozoum pelagicum, Haeckel. 



Collozoum pelagicum, Haeckel, 1862, Monogr. d. Radio!, p. 525, Taf. xxxii. figs. 4, 5. 

 Sphcerozoum pelagicum, Haeckel, 1860, Monatsber. d. k. Akad. d. Wiss. Berlin, 1860, p. 845. 



Central capsules small, quite irregularly formed, roundish-polyhedral or depressed-polygonal, 

 transparent, without oil-globules. Often many extracapsular oil-vesicles in the common jelly-body 

 between the central capsules. Membrane very thin and delicate. 



Dimensions. Diameter of the central capsules 0'02 to 0'08. 



Habitat. Mediterranean, Messina, Haeckel ; Naples, Brandt ; surface. 



12. Collozoum stellatum, n. sp. 



Collodastrum stellatum, Haeckel, 1882, Manuscript. 



Central capsules star-shaped, irregularly radiating, with a great number (eight to twenty or 

 more) of radial, short, conical, acute processes, very variable in size and number. Membrane thin. 

 In every capsule several (four to eight) oil-globules. 



Dimensions. Diameter of the central capsules 0'12 to 0'2. 



Habitat. Central Pacific, Station 274, surface. 



13. Collozoum amceboides, n. sp. (PI. 3, figs. 4, 5). 



Collodastrum amceboides, Haeckel, 1882, Manuscript. 



Central capsules amoebiform, of moderate size, quite irregularly formed, with a variable number 

 of finger-like, obtuse, irregular prolongations (commonly three to six), very variable in size and 

 form. Membrane thin. In the centre of every capsule one single oil-globule. 



Dimensions. Diameter of the central capsules 0'04 to 0'08. 



Habitat. Indian Ocean, Ceylon, Haeckel ; Madagascar, Eabbe ; surface. 



Suborder II. BELOIDEA, Haeckel. 



Definition. SPUMELLAEIA with an imperfect skeleton, composed of numerous solid 

 needles or spicula, scattered irregularly in the calymma. 



The suborder Beloidea comprises all those SPUMELLARIA which possess an 

 imperfect or rudimentary skeleton, composed of a variable number of isolated spicula 

 scattered in the extracapsulum. The suborder contains only two different families, 

 the solitary Thalassosphaerida (or Beloidea monozoa) and the associated Sphsero- 

 zoida (or Beloidea polyzoa). Both families are very nearly allied, and differ only 

 in one single character : the solitary life of the former, the social union of the 



