clviii 
THE VOYAGE OF H.M.S. CHALLENGEE. 
Family I. Azoricida:. 
Rhizomorina {pars), Zittel, Abhandl. d. k. baier. Akad. d. Wiss., Bd. i. p. 97, 1878. 
Micromorinidee, Sollas, Spongise, Encyclopaedia Britannica, vol. xxii. p. 421, 1887. 
Anoplia in which the desmas are monocrepid. 
Genus 1. Azorica, Carter. 
Azorica, Carter, Ann. and Mag. Nat. Hist., ser. 4, vol. xii. p. 442, 1873. 
The pores and oscules are simple, and are borne on opposite surfaces of the plate-like 
sponge. 
Type — Azorica pfeifferse, Carter (p. 319). 
Genus 2. Tretolophus, n. gen. 
Azoricidse in which the oscules are arranged in a linear series along the summit of a 
ridge-like elevation. Main excurrent canals more or less vertical. 
Type — Tretolophus paniceus, n. sp. (p. 325). 
Genus 3. Gastrophanella, 0. Schmidt. 
Gastrophanella, 0. Scbmidt, Spong. Meerb. Mexico, p. 29, 1879. 
Azoricidse in which a single oscule leads into a long axial cloaca; the excurrent and 
incurrent canals are arranged as in Siphonia. 
Type — Gastrophanella implexa, 0. Schmidt (p. 349). 
(?) Genus 4. Setidium, 0. Schmidt. 
Setidium, 0. Schmidt, Spong. Meerb. Mexico, p. 30, 1879. 
Diagnosis not given. 
Type — Setidium ohtecum, 0. Schmidt (p. 350). 
(?) Genus 5. Poritella, 0. Schmidt. 
Poritella, O. Schmidt, Spong. Meerb. Mexico, p. 27, 1879. 
Diagnosis not given by Schmidt ; founded on a single dead specimen. 
Type — Poritella decidua, 0. Schmidt (p. 351). 
