94 



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.-^ 



I. Subfamily 



Acrosphaerida. 

 (Lattice-shell simple, 

 without an external 

 mantle of network. ) 



Synopsis of the Genera of Collosphcenda. 



T . , -i.!. i f Inside smooth, . 



Inside -without J 



Outside of the 

 shell smooth, 

 ^¥ithout spines 

 or tubuli. 



tubuli. 



( Insid 



e spmy, 



29. Collosphcera. 



30. TribonosphcBra. 



T -1 -,1 L- { Tubuli imperforated, . 31. Pharynqosvh/Bra. 

 Insidewithcentri- J ^ ' j a c 



' ■ ( Tubuli fenestrated, . 32. Buecinos;phcera. 



Spines irregularly 



scattered on the sur- 

 face, . . . 33. Acrosphcera. 



Outside of the shell armed with solid 

 spines, but without hollow tubuli. 



Each larger pore 

 with one single 

 spine, , 



34. OdoJitosphcera. 



Outside of the 

 shell with ir- 

 regular radial 

 tubuli, the wall \ 

 of which is 

 solid, not fenes- 

 trated. 



Tubuli simple, 

 not branched. 



Each larger pore with 



a coronal of sjjiues, 35. Chcenicospkcera. 



Mouth of the tubuli 



truncated, smooth, 36. Siphonosphcera. 



ISIouth with one single 



large tooth, . . 37. Mazosphmra. 



jNIouth with a coronal 



of teeth, . . 38. TrypancsphcBra. 



Tubuli irregularly branched, each with two 



to four or more openings, . . .39. Caminosphcera. 



Outside of the shell with irregular 

 radial tubuli, open on both ends, 

 with fenestrated wall 



II. Subfamily 



Clathrosphjerida. 

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



^louth of the tubuli 



truncated, smooth, 40. Solenosphcera. 



Mouth with one single 

 ' large tooth, . . 41. Otosphmra. 



Mouth with a coronal 



of teeth, . . 42. Coro7iosphiera. 



f Surface of the outer 



I shell smooth, . 43. Clathrosphcera. 



Surface of the outer 

 [ shell thornj', . . 44. XanthiosplKP.ra. 



Subfamily Acrosph^rida, Haeckel, 1881, Prodromus, p. 471. 



Definition. — C o 1 1 o s p h fe r i d a with one simple lattice-shell around every central 

 capsule of the coenobium. 



^ Loc. cit., p. 535, Taf. sxxiv. fig. 1. 



