General History of the Marine Polyzoa. 245 



oral extremity, suberect, slightly separated, overlapping one 

 another considerably, entirely open in front ; oral valve arched 

 above, straight below ; two tall and stout spines at the top of 

 the cell, slightly divergent, and five or six on each side, of 

 which the uppermost pair is stouter than the rest and erect, 

 the others slender, acuminate, bent inwards over the area ; 

 connecting-tubes six, short ; on one side (originating between 

 the second and third spines) an articulated avicularium, borne 

 on a rather tall peduncular support, somewhat cup-shaped, 

 expanding very slightly upwards, not swollen below, subtrun- 

 cate above, the beak but little developed and the projecting 

 extremity not hooked, mandible short, triangular, surface 

 smooth and glossy ; dorsal surface convex, smooth, destitute 

 of spines, radical fibre given off from a small tubular projec- 

 tion towards the upper part of the cell. Ocecium (?). 



Loc. Napier, New Zealand (Miss Jelly). 



In this species the large size of the cells and the two conspi- 

 cuous prong-like spines at the summit are characteristic points. 

 But the most striking feature is the avicularium (fig. la), 

 which is of a peculiar type, and from the feeble development 

 of its anterior portion (or beak) presents much less of the 

 appearance of a bird's head than is usual amongst the articu- 

 lated forms. It consists of a cup-like structure of about equal 

 width throughout, from the truncate upper extremity of which 

 the beak projects very slightly ; the peduncle is rather long. 

 In form it offers a striking contrast to the avicularium of D. 

 spinigera, MacGillivray, a kindred Australian species (PI. IX. 

 % 3). 



Diachoris quadricornufa, n. sp. (PI. IX. fig. 2.) 



Zooecia placed very closely together (smaller and more 

 compact than those of the last species), slightly expanded 

 below, narrowed above, overlapping (but not so much as in 

 D. elongata), entirely open in front; at the tup four mode- 

 rately sized blunt spines, and on each side from six to nine, 

 set very closely together and bending inwards, with the excep- 

 tion of the two uppermost, which are larger than the rest and 

 suberect ; connecting-tubes six, very short ; a little below 

 the top on one side an articulated avicularium of the same 

 type as that of D. elongata, but smaller; peduncle very 

 slender; beak more prominent than in the last species, 

 sloping upwards towards the free projecting extremity ; man- 

 dible pointed, rather long and slender. Dorsal surface 

 smooth, without spines. Ocecium (?). 



Loc. Australia (Miss Jelly). 



