12 Rev. T. Hincks on the 



tory. They must not be confounded with the processes on 

 the so-called " tower-cells," which originate on the membra- 

 nous front wall of the zooecium ; both are probably abnormal 

 growths with no special function. 



[Norway, Britain, Brittany, Adriatic ; New Zealand, Aus- 

 tralia.] 



Menibrampora memhranacea^ form serrata. 



Zocecia rectangular-oblong, greatly elongated ; margins 

 smooth ; at the top of the cell, on each side, a short bltmt spine ; 

 round the inner margin a narrow crenated border. 



Loc. Virago Sound, spreading over the surface of a sea- 

 weed. 



This is a remarkably pretty variety, and presents a very 

 distinctive appearance. The cells are of unusual length, and 

 exhibit great regularity both of form and arrangement. But 

 the character which distinguishes it most and gives it a very 

 marked individuality is the narrow crenate edging which 

 fringes the inner margin of the cell. The crenulations are 

 small and close-set and for the most part regular j here and 

 there longer spinous processes rise amongst them, and project 

 over the area. One of these is always placed in the centre of 

 the lower margin of the cell. 



Family Microporidie. 

 MiCROPORA, Gray. 



Micropora coriacea^ Esper, var. 



The form in which the marginal nodules are wanting is 

 extremely abundant amongst the dredgings. It is, indeed, 

 one of the commonest species, covering many of the shells with 

 its flat glossy crust, and seldom altogether absent from any. 



[Bass's Straits, Australia, var. ; Britain, Florida, with the 

 nodules.] 



Family Cribrilinidae. 



Cribrilina, Gray. 



Gribrilina fu7'cata, n. sp. (PL XX. fig. 5.) 



Zocecia ovate, quincuncial, very regularly disposed, mode- 

 rately convex ; surface smooth and lustrous, often of a reddish 

 brown colour ; on each side from four to six shallow grooves, 

 radiating to a median line, and a central one below, which are 

 occupied by a row of roundish pores set very closely together, 



