THOJrsox. — AdfJltions to flw K iioirbiJye of Uradiiojidda. 41 



Art. IV. — Additions to the Knowledge of the Recent and Tertiary Bracliio- 

 poda of New Zealand and Axstralia. 



By J. Allan Thomson, M.A., D.8c., F.G.S., Director of the Dominion 



JMuseiim, Wellington. 



[Bead before the Weltington Philosophical Society, 27th October, 1915.] 



Plate I. 



Contents. 



Page 



{1.) A new .specie^ of Crania from New Zealand waters . . . . . . 41 



{2.) The generic position of the Tertiary Terebratnlids of the Southern Hemi- 

 sphere . . . . . . . . . . . . . . . . 42 



(3.) The generic position of Terebratulina davidsoni Etheridge and Magasetla 



exarata \'erco . . . . . . . . . . . . . . 4.5 



(4.) On a new form of Terebratella from New Zealand waters . . . . . . 4(5 



List of papers referred to . . . . . . . . . . . . . . 46 



Explanation of plate . . . . . . . . . . . . . . 47 



(] .) A New Species op Crania from New Zealand Waters. 



Crania huttoni sp. no v. Plate I, figs. 1, 2. 



1873. Crania sp. md. Hutton, Cat. Mar. Moll. N.Z.. p. 87. 

 1906. Crania sp. Hamilton, Bull. Col. Mus., No. 1. p. 41. 



" Dorsal valve rugose, with a few radiating lines in places ; ventral 

 valve smooth. Light brown. Diameter about 0-5 (inch).'"- — -Hutton. 



There is in the Dominion Museum a tablet holding three valves from 

 an unknown locality which purport to be the specimens upon which Hutton 

 based the above brief description. All three valves, however, appear to 

 b? dorsal valves, and the apparent absence of radiating lines on two of 

 them is due in one case to attrition on the sea-bottom and in the other 

 to an encrusting organism. There is also in the Museum another tablet 

 of seven valves- which are those mentioned by Hamilton as '' Trail ; 

 Whangaroa, Cook Strait."' Of these seven, the two smallest are the 

 young of Anomia sp., but the other five are dorsal valves of the same 

 species of Crania as Hutton's specimens. In view of the locality record 

 attaching to the latter specimens, the best preserved of these is chosen as 

 the holotype. 



In outline the shell tends to be nearly square, with rounded angles, 

 but there is considerable irregularity among the eight specimens, and in 

 two the posterior margin is slightly embayed in the middle. In the nearly 

 square shells the commissures are practically in one plane, but in the more 

 irregularly shaped specimens they are sinuous. The dorsal valve is conical 

 or limpet-shaped, with the vertex generally in the middle line of the shell, 

 although in the holotype it is slightly to one side ; it is directed oblicj^uely 

 backward, and is situated at from one-third to one-fifth of the length of 



