Thomson. — Brachiopod Genera. 



403 



round foramen whose anterior lip projects slightly forward; beak-iidgef 

 fairly sharp, delimiting a false area, the greater part of which is occupied 

 by a large solid concave pseudo-deltidium. Surface of valves smooth with 

 numerous strong growth-lines. 



Dimensions in Millimetres.- — 

 Holotype 

 ParatypesJ 



Length.^; 

 .. 10 

 .. 10-6 

 11 

 9-8 



\Type Locality.- — Base of main limestone, cuesta between Mount Brown 

 and the Waipara Biver, North Canterbury. 



Magadina waiparensis sp. nov. Fig. 8, a, M 



This species so closely resembles M. broivni that the differences only 

 need be indicated. M. waiparensis is slightly more elongate, more con- 

 vex, and the dorsal valve more arched from back to front. The beak is 

 much more produced, and more incurved, and in consequence the pseudo- 

 deltitidium is higher and more concave. 



Type Locality. — Lowest Mount Brown limestone, in cliffs of the Deans- 

 Waipara cuesta opposite the Barn's Paddock, Middle Waipara district, 

 North Canterbury. 



Pachymagas huttoni sp. uov. Fig. 2, c. 



1905. Magellania triangularis Hutton, Trans. N.Z. Inst, 

 p. 477 (not the species of 1873). 



vol. 37, 



Description.- — Shell suborbicular, greatest width about the middle ; hinge- 

 line short, obtusely angular. Dorsal valve depressed, with a faint anterior- 

 sinus, slightly produced and reflected in front ; ventral valve strongly and 

 broadly carinated, sides rather flattened ; margins of valves fairly sharp ; 

 anterior commissure with a broad moderately deep anterior sinuation. 

 Beak small, inflated, not greatly incurved, truncated by a moderately large 

 circular foramen ; beak-ridges fairly sharp, pseudo-deltidium broad, low, 

 Surface of valves smooth with numerous growth-lines. 



concave. 



Dimensions of Holotype. — * 



Length. 

 43 mm. 



Breadth. 

 41 mm. 



Thickness. 

 23 mm. 



Type Locality.- 

 north of Ngapara. 



-Maerewhenua limestone, crossing of Awamoko Biver, 



* The holotype is in the Dominion Museum, and is not the specimen here figured. 



