llll'lTKAUIA KGERTONI. 549 



HlPPURARIA EOERTONI, Busk. 

 Plate LXXVIH. figs. 1-4. 



EiiEKToxi, Butk, Proc. Zool. Soc. Lond. for Jan. 6, 1874, 29, 

 pl.v. 



Stem erect, obscurely jointed, with nodular enlarge- 

 ments at nearly equal distances apart. Zocecia at- 

 tached by a movable joint to long, slender, transpa- 

 rent peduncles, which are clustered at the nodes, 

 springing from all sides of the stem, pyriform, attenu- 

 ated at the base and widening upwards to the top, where 

 they are about three times as broad as below, the dorsal 

 side somewhat gibbous, on the front (or ventral) side 

 a broadly elliptical area, occupying about two thirds of 

 its whole extent, with a membranous covering. ? Fre- 

 naculum. 



Height of cell and peduncle about i inch. 



WE must wait for a more satisfactory account of this 

 interesting species until its rediscovery may give the op- 

 portunity of making a thorough study of its structure. 

 The fragment on which Busk's description is founded was 

 about a quarter of an inch in length ; it had been dried 

 and reexpanded, and was, of course, in a very unfavourable 

 state for examination. The sketch of the Polyzoon when 

 alive, by Sir P. Egerton (Plate LXXVIII. fig. 3), shows the 

 extent to which the cell can be bent upon its peduncle. 



HABITAT. On the carapace of Crustacea. 



LOCALITY. Berehaven, Ireland, on Gonoplax angulatus 

 (Sir Philip Egerton). 



