cliv 
THE VOYAGE OE H.M.S. CHALLENGER. 
Genus 4. Kaliapsis, Bowerbank. 
Kaliapsis, Bowerbank, Proc. Zool. Soc. Lond., pp. 76, 337, 1869. 
Tetracladidse which occur as thin incrusting plates, having the desmas of the base 
peculiarly modified ; the discotrisenes are tuberculated on the outer surface. The micro- 
sclere is a microstrongyle. 
Type — Kaliapsis cidaris, Bowerbank (p. 334). 
Genus 5. Neosiphonia, n. gen. 
Tetracladidse with a more or less ovate body supported on a longer or shorter stem ; 
canal-system as in the fossil genus Siphonia. The ectosomal megascleres are dicho- or 
trichotrisenes. The microsclere is a spiraster (?). 
Type — Neosiphonia superstes, n. sp. (p. 299). 
Genus 6. Rimella, 0. Schmidt. 
Rimella, 0. Scbmidt, Spong. Meerb. Mexico, p. 21, 1879. 
This genus is founded on dead specimens of a single species. 
Type — Rimella clava, 0. Schmidt (p. 335). 
Genus 7. Collinella, 0. Schmidt. 
ColUnella, 0. Schmidt, Spong. Meerb. Mexico, p. 21, 1879. 
This genus is founded on dead skeletons of a single species. 
Type — Collinella inscripta, 0. Schmidt (p. 336), 
Genus 8. Sulcastrella, 0. Schmidt. 
Sulcastrella, 0. Schmidt, Spong. Meerb. Mexico, p. 27, 1879. 
This genus is founded on a single species, the characters of which are very insufficiently 
given by Schmidt. 
Type — Sulcastrella clausa, 0. Schmidt (p. 337). 
Family JI. Corallistida:. 
Rhizomorina {'pars), Zittel, Abhandl. d. k. baier. Akad. d. Wiss., Bd. i. p. 97, 1873. 
Megamormidx'{pars), Sollas, Encyclopaedia Britannica, vol. xxii. p. 424, 1887. 
Trigenosa in which the desma is monocrepid and tuberculate. Chamber-system 
aphodal. 
