III. GENERAL SYSTEMATIC ACCOUNT OF THE GENERA, SPECIES, 

 AND VARIETIES OF GEODIDAE FROM THE PACIFIC OCEAN. 



Geodidae. 



Tetraxonia with rhabd, tcloclade and usually also mesoclade megascleres, 

 and a superficial armour composed of massive, spheroidal, or ellipsoidal sterr- 

 asters. Euasters are always, ataxasters or microrhabds sometimes, present. 

 Without desme megascleres and without thin, disc-shaped sterrasters. 



This family, as now limited, comjjrises the genera Caminella Lendenfeld, 

 Pachymatisma Johnston, Caminus 0. Schmidt, Isops Sollas, Sidonops Sollas, 

 Geodia Lamarck, and Geodinella Lendenfeld. 



All of these, with the exception of Pachymatisma, occur in the Pacific Ocean. 



Ninety-four species of Geodidae are known; forty-six occur in the Pacific 

 Ocean, and five of the Pacific species are further divided into fifteen varieties. 



CAMINELLA Lendenfeld. 



Among the megascleres are regular triaenes. The tetraxon megascleres 

 arc confined to the superficial part of the sponge and arranged radially. The 

 dermal microscleres are asters. The afferents are uniporal ; the efferents larger 

 oscula. 



Two species are known; one of which, (7. nigra (Lindgren), occurs in the 

 Pacific Ocean. 



Caminella nigra (Lindgren). 

 Lendenfeld. Tierieich, 1903, 19, p. 90. 



Isops nigra Lindgren, Zool. anz., 1897, 20, p. 486. Zool. jahrb. Syst., 1898, 11, p. 352, plate 18, fig. 11, 

 plate 20, fig. 7a-e. 



Ellipsoidal. Black. 



Large amphioxes: 900 by 20 /x. Minute amphioxes: 72 by 2 /«. Plagio- 

 protriaenes: rhabdome 960 by 20 /i; clades 96 fi long; cladome 180 u broad 

 and 60 /.i high; clade-angles about 135°. 



