SILICIOUS AND HORNY SPONGES WILSON. 385 



Hentschel, 1912, deletes Amphitethya, making it synonymous with 

 Paratetilla; but, as far as the records enable one to judge, the two 

 genera represent different character-combinations, and both should be 

 retained. Paratetilla aruensis Hentschel, 1912 (p. 329), which has 

 amphitriaenes, thus becomes Amphitethya aruensis. 



Genus FANGOPHILINA O. Schmidt (1880). 



Fangophilina O. Schmidt, 1879-80, p. 73. 

 Spongocardium Kirkpatrick, 1902, p. 224. 



With microscleres, with two unlike vestibular spaces or poriferous 

 depressions, of which one belongs to the incurrent, and one to the ex- 

 current system. 



O. Schmidt's Fangophilina sub?nersa, from the Caribbean, was ten- 

 tatively placed by Sollas, 1888, along with Cinachyra. Lendenfeld, 

 1903, classed it with that genus. Kirkpatrick, 1905, and Lendenfeld, 

 1906, regard Fangophilina as a good genus, of which Spongocardium 

 is a synonym. The genus includes in addition to F. submersa O. 

 Schmidt, F. {Spongocardium) gilchristi Kirkpatrick, 1902 (p. 224), 



and F. hirsuta Lendenfeld, 1906 (p. 157). 



******* 



Under Tethyopsilla (Lendenfeld, 1888), Lendenfeld (1903) groups 

 along with his type, T. stewartii, a number of species assigned by 

 Sollas and some others to Tetilla and Craniella. Dendy has sug- 

 gested that the genus, characterized by the absence of microscleres, 

 is an artificial (polyphyletic) one. It seems clear that microscleres 

 are sometimes lost. The genus, in the classification followed in this 

 report, is deleted and the species distributed. Hentschel (1911, 

 1912), however, uses it, as does Baer (1906). 



Topsent (1913&, p. 14) would group certain of the species re- 

 ferred by Lendenfeld to Tethyopsilla under a new genus Crani- 

 ellopsis. These are the species which resemble Craniella in pos- 

 sessing cortical oxeas. They are C. infrequens (Carter), C. zet- 

 landica (Carter), and C. lentiformis (Thiele). To them Topsent 

 adds C. azorica, new species, from the Azores. Some would doubt- 

 less prefer, with the writer, to set off these forms from Craniella as 

 a subgenus, it being understood that such a subgenus, based on a single 

 character, will include forms in which the character has been 

 acquired by analogical variation and between which therefore the 

 genetic relationship is not especially close. 



Suborder Halichondrina. 



Halichondrina Vosmaer 1887 ; Ridley and Dendy, 1887 ; and Authors. 

 Megascleres all monaxonid. Skeleton very commonly reticulate or 

 fibrous, with a good deal of spongin. Microscleres, when present, 

 either sigmas or derived forms such as chelas. 



