278 C. M. Maplestone: 



pide tube with the distal margin of cryptocyst and the lateral 

 walls. Oral shelf forming a subtriangular arch in the "B" 

 zoocia, but is hardly perceptible in the " A " zooecia. 



" A " zooecia 0.9 to 1.2 mm. long, 0.7 to 0.8 mm. wide . 



" B" zooecia 1.5 mm. long, 0.7 to 0.8 mm. wide. 



Locality.— Clifton Bank. Muddy Creek (Dr. Hall). 



In this species as in S. lateralis the polypide tube is asym- 

 metrical, but instead of descending abruptly to the basal wall, 

 as in that species, it extends to a considerable distance distally. 

 In the figure given the zooecium on the left-hand at the top is 

 an " A ■' form, the others are all " B " zooecia. 



Steganoporella corioensis, n. sp. (PI. XLIV., Fig. 30). 



Zoarium encrusting. Zooecia dimoi'phic, quadrate, arched 

 distally. Cryptocyst in the " A " zooecia occupying about a 

 third of the area ; in the " B " zooecia nearly half ; in both very 

 finely perforated. Oral shelf in the '" B '' zooecia forming a 

 subtriangular arch; veiy narrow in the " A"' zooecia. Polypide 

 tube shoi't ; median process with flanges connecting it with distal 

 end of cryptocyst. 



•' A '■ zooecia 1. to 1.2 mm. long, 0.5 to 0.8 mm. wide. 



■■ B " zooecia 1.3 to 1.4 mm. long, U.8 mm. wide. 



Locality.— Corio Bay (Dr. Hall). 



In this species the polypide tube is not exactly in che median 

 line, and is inclined slightly to one side or the other. In the 

 figure the three upper zooecia are of the '' B " form, the three 

 lower are of the " A "' foi-m. 



Steganoporella elongata, n. sp. (Pi. XLV., Fig. 31). 



Zoarium probably in vincularian form. Zooecia dimorphic, 

 elongate, arched and overlapping distally. Cryptocyst depressed, 

 finely perforated; median process produced distally as a hemi- 

 spherical cup, representing the polypide tube, with a sinus on 

 each side. Oral arch in the "B" zooecia forming a subtrian- 

 gular arch. 



"A" zooecia 1. to 1.2 mm. long. 0.4 mm. wide. 



■ B " zooecia 1.5 to 1.9 mm. lone, 0.6 mm. wide. 



