4 1 2 G. M. Maplcstone : 



and lower purts of the operculum show it to be a Megapora ; the 

 membranous covering of the lower part is sometimes wanting, 

 and shows an opening into the interior of the zooecia. 



It is worthy of note that the other two species of this genus 

 have been found in high latitudes only ; M. riugens. Busk, in 

 the Shetland Islands (this species has no perforations in the front 

 wall) ; M. hyalina, Waters, is recorded from the Antarctic re- 

 gion among the Polyzoa obtained on the voyage of the " Bel- 

 gica." This species has small perforations in the front wall, and 

 also some spines. The ^^resent specimen has no spines. 



Steganopopella porteri, n. sp. (PI. XXVI., Fig. 4). 



Zoarium encrusting. Zooecia quadrate, margins raised. 

 Cryptocyst occupying about two-thirds of area ; distal margin 

 curved and studded with small tuberosities ; surface perforated, 

 the perforations have raised margins ; " tube "' opening upwards. 



Locality, Solomon Islands. 



I include this species from the Solomon Islaiids, as it differs 

 very considerably from the next species described, and from 

 those described by Prof. Harmer in his revision of the genus 

 published in the Quarterly Journal of Microscopical Science, 

 vol. 43, p.. 225, ff. The specimen is somewhat imperfect, and 

 has minute fragments of sand, etc., adhering to it which obscure 

 the surface of some of the zooecia. Only a few show any part 

 of the membranous outer wall, and one or two of the opercula 

 are present. There is no trace of dimorphism in the zooecia. 

 The " tube " takes the form of a cup, being consti-icted into a 

 narrow neck at a short distance below the upper surface. The 

 ]ierforations in the cryptocyst are very peculiar, having raised 

 margins, causing an appearance similar to that of a thin metal 

 plate pierced with a blunt punch from beneath. 



SteganopoPella minuta, n. sp. (PI. XX VT., Fig. 5). 



Zoarium encrusting. Zooecia subhexagonal, arched above; 

 margins raised, very rugose. Cryptocyst granulated, not per- 

 forated ; opening subtriangular, but very irregular in shape. 



I liave ])laced this in Steganojiorelia, as the zooecia have a 



