A KE VI SIGN 01' THE GENUS STEGANOPOKELLA. 285 



growths from the median process. This has unusually 

 everted walls, its cavity may be otherwise normal, but in 

 several cases it is shallow or even evanescent. The Queens- 

 land specimen (/) approaches the one last described in the 

 form of the main sclerite of the A opercula, which are 

 distinctly large, and in the large size of their teeth, which 

 number from 22 to 24. The b opercula are relatively short, 

 the parallel part of the main sclerite being little developed. 

 The number of teeth is only 18 to 20, the minute proximal 

 teeth being fewer than in the type. In some of the zooecia 

 the cavity of the median process is unusually shallow or even 

 evanescent, the convex (tuberculated) roof of the tube being 

 almost on a level with the proximal part of the cryptocyst ; 

 but it may resemble that of the type. The cavity may be 

 developed on only one side of the roof of the tube. The 

 cryptocyst may be somewhat thickened and tuberculated at 

 the commencement of its descent. 



Specimen d (St. Vincent; without opercula) and k and I 

 (doubtful locality) are not specially noteworthy ; h has no 

 opercula; j (John Adams' Bank, cf. p. 254) is also a normal 

 S. magnilabris. 



Specimen e (Honolulu) is of Escharan habit, with narrow 

 branches, as described in the Challenger Report. The zooecia 

 and opercula are distinctly small, b being variable in form ; 

 the teeth of A are very minute and even vestigial, and the 

 basal sclerite is hardly complete across the middle. The 

 calcareous parts are, in the older regions of the colony, more 

 massive than in the type, both oral and post-oral shelt" being 

 more developed and more tubercular. The horizontal part 

 of the cryptocyst is smaller and thicker, and may be thickened 

 and tubercular where it joins the descending portion. The 

 asymmetry of the lateral recesses is well marked here, as in 

 other cases. 



Specimen i (Philippine Islands), which is not alluded to in the 

 'Challenger Reports' (xxx and Ixxix), is of Escharan habit, 

 but is more foliaceous than the last specimen. The b opercula 

 are relatively short, though with distinct parallel portion of 



