RESULTS OF DEEP-SEA INVESTIGATIONS — MAPLESTONE. 271 



raised p-ristorne ; one or two small elevated pores on lower mar- 

 gin. Surface of zoarium covered with nianiillte and numerous 

 avicularia of various forms, some with sub-circular, some with 

 oval, some with triangular mandibles ; one of them bears a 

 striking resemblance to the thyrostomeof B. ebumea, being semi- 

 circular in shape with a sinus in the straight margin. 



Obs. — This species, of which there is only one specimen, is 

 very near B. (Eschara) umbonata, Haswell, but I consider it to 

 be distinct from it. Haswell's description of the species savs : — 

 "Mouth varying in form, the lower lip sometimes straight, some- 

 times with a round central lobe. Surface ornamented with 

 numerous rounded knobs of various sizes and small scattered 

 avicularia," and his figure agrees with his description ; but a 

 specimen lent to me some time ago by Mr. T. Whitelegge showed 

 all the mouths (thyrostomes) to be broadly oval with a sharp 

 sinus in the lower part and all the avicularia were small, elong- 

 ated and oval. In the present species the thyrostomes are 

 orbicular with no trace of a sinus, and have a slightly raised 

 margin (peristome) and are much further apart, showing that 

 the zooecia are much larger. The avicularia, as above stated, 

 have variously shaped mandibles, and one, as noted, exactly 

 resembles the thyrostome of B. ebumea, but is very much 

 smaller. 



Selenaria nitida, sp.nov. 

 (Plate lxxvii., fig. 8). 



Zoaria discoid, slightly raised in the centre. Base flat and 

 smooth. Zooecia in radiating lines, front surface with sub- 

 quadrate ridges within which the thyrostome is raised ; surface 

 granular. Thyrostome small, arched above, nearly straight 

 below. Vibracular area elongated, constricted in the middle; 

 surface perforated, vibracular pit at distal end circular, with a 

 notched process on the proximal end below the level of the 

 opening. 



Obs. — This is very near S. concinna, but the zooecia are uniformly 

 smaller in size ; the vibracular area is different and the under 

 surface of the zoaria is quite smooth. 



Hiantopora perforata, sp.nov. 



(Plate lxxviii., tig. 9.) 



Zoarium encrusting. Zooecia undefined, surface covered with 

 large round pores. Thyrostomes broad, somewhat irregular in 

 shape with raised margins and a prominent mucro on the 

 proximal one ; elongated avicularia scattered about. 



