THE VOYAGE OF H.M.S. CHALLENGER. 



without shells, the outer only surrounded by shells. Already in my Monograph I had 

 described the same peculiar formation. 1 



I. Subfamily 



Acrosphserida. 

 (Lattice-shell simple, 

 without an external 

 mantle of network. ) 



Synopsis of the Genera of CollospJicerida. 



Inside without j Inside Sm0oth > ' 

 ( Inside spiny, . 



Outside of the 

 shell smooth, 

 without spines 

 or tubuli. 



Inside with centri- 

 petal tubuli. 



Outside of the shell armed with solid 

 spines, but without hollow tubuli 



Outside of the 

 shell with ir- 

 regular radial 

 tubuli, the wall 

 of which is 

 solid, not fenes- 

 trated. 



Tubuli imperforated, . 

 Tubuli fenestrated, . 



Spines irregularly 

 scattered on the sur- 

 face, 



Each larger pore 

 with one single 

 spine, . . . 



Each larger pore with 

 a coronal of spiues, 



Mouth of the tubuli 

 truncated, smooth, 



Mouth with one single 

 large tooth, . 



Mouth with a coronal 

 of teeth, 



Tubuli irregularly branched, each with two 

 to four or more openings, 



Tubuli simple, 

 not branched. 



Outside of the shell with irregular 

 radial tubuli, open on both ends, 

 with fenestrated wall. 



II. Subfamily 



Clathrosphaerida. 



(Lattice-shell double, with an external mantle of network. ) 



Mouth of the tubuli 

 truncated, smooth, 



Mouth with one single 

 large tooth, . 



Mouth with a coronal 

 of teeth, 



Surface of the outer 

 shell smooth, 



Surface of the outer 

 shell thorny, . 



29. Collosphcera. 



30. Tribonosphcera. 



31. Pharyngosphcera. 



32. Buccinosphcera. 



33. Acrosphcera. 



34. Odontosphcera. 



35. Chcenicosphcera. 



36. Siphonosphcera. 



37. Mazosplicera. 



38. Trypancsphcera. 



39. Caminosphcera. 



40. Solenosphcera. 



41. Otosphcera. 



42. Coronosphcera. 



43. Clathrosphcera. 



44. Xanthiosphcera. 



Subfamily ACROSPH/ERIDA, Haeckel, 1881, Prodromus, p. 471. 



Definition. C ollosphserida with one simple lattice-shell around every central 

 capsule of the ccenobium. 



1 Loc. c-;t., p. 535, Taf. xxxiv. fig. 1. 



