319 



Escharoides sauroglossa n. sp. 

 ? Smittia praestans Waters, Annals Nat. Hist. ser. 6, Vol. IV, 1889, p. 17, 



PI. Ill, figs. 9-11. 

 (PI. XVII, figs. 6 a-f). 



Seen from the basal aspect the contour of the zocecia is more or less regul- 

 arly hexangular, and the evenly arched frontal surface, somewhat ascending to- 

 wards the distal end, is provided with numerous, large, scattered pores, which 

 are in part the outer openings of pore-canals, The peristome is medially provided 

 with a fairly broad and deep, rounded sinus, and just behind or within the centre 

 of this projects an elongated but strong tooth, which narrows from a broad base 

 outwards. There is internally on each side of the sinus a strong, triangular, lateral 

 tooth. The well-developed distal arch, the central part of which is somewhat 

 prominent, has a finely tuberculated, somewhat thickened margin. The strongly 

 chitinized operculum has a very characteristic form. It is longer than broad, and 

 its broader proximal part, which is provided with a concave margin, runs out 

 on each side into a short, hook-like pi-ojection. The two somewhat bent and dis- 

 tally converging lateral walls pass over in the distal half of the operculum into 

 a narrow, recurved marginal part. The operculum is provided at the tip with a 

 deep, rounded incision, and it thus comes to end in two, sometimes equally large, 

 sometimes unequally large points. This operculum takes up such a position, that 

 its forked end reaches over to the distal margin of the aperture, whilst the proxi- 

 mal part, which is connected with the compensation-sac, arises at a fairly long 

 distance proximally to the median tooth. Each half of the distal lateral walls is 

 provided with 2—3 multiporous rosette-plates and each distal wall with 2 multi- 

 porous pore-chambers and 1 — 2 interjacent rosette-plates. 



Ooecia are wanting on the colonies investigated. 



The avicularia, which vary greatly in size, occur in pairs, and the two be- 

 longing to the same zocecium may sometimes be of the same, sometimes of very 

 different size. The freely prominent avicularian chamber, which is provided with 

 scattered pores, has a strongly developed cryptocyst and the mandible is obliquely 

 lyre-shaped in the larger, obliquely oval in the smaller avicularia. 



Two small, free, one-layered colonies are to hand from 33" 7' N., 129" 20' E. 

 and 33° 8' N., 129° 20' E.; depth 36—40 fm. (Schanau). 



In a small colony from Port Phillip, Victoria (Miss Jelly), the aperture has 

 no sinus nor lateral teeth, and there is usually only a single avicularium. The 

 operculum has almost even lateral margins and is only slightly indented at the 

 point. 



