476 Zoological Society. 



edge of the valve double ; siphonal inflection short, broad ; hinge- 

 tooth of left valve folded together, moderate ; of right valve small, 

 separate ; lateral teeth short, small, close to hinge-tooth of left valve 

 double ; the ligament small, just within the cardinal edge, not sepa- 

 rated by any shell plate from the cartilage, and partly hidden from 

 view bv the upper edge of the hinge-margin ; the cartilage very large, 

 inclosed in a large, elongate, shallow, triangular pit on the upper part 

 of the hinder internal rib. 



The position of the cartilage-pit and the internal ribs at once sepa- 

 rate this genus from Spisula. 



Vanganella Taylorii. 



Shell rather compressed, white, smooth, covered vnih a pale brown- 

 ish-white polish ; periostraca darker coloured on the upper part of 

 the front edge ; the upper hinder slope irregularly wrinkled with 

 periostraca. 



Hub. New Zealand. 



Arachnoides Antipodarum. 



Body rather convex, with five broad sunken grooves, rather more 

 than one-third the width of the sections of the body, and forming in- 

 flexed spaces on the edge of the circumference ; ambulacra nearly 

 straight, and regularly diverging, without any isolated pores between 

 the end of the ambulacra and the circumference of the body. 



Hab. New Zealand. Coast of Wanganui. 



This species is easily known from the A. placenta of the North Sea 

 (Agassiz, Monog. t. 21. fig. 25-42) by its being rather larger and con- 

 siderably more convex, and in the grooves edged above by the ambu- 

 lacra being broader compared to the sections of the shell. It differs 

 also in having the ambulacra nearly straight and without any isolated 

 pores between them, as in the edge of the shell figured by Agassiz, 

 t. 21.f. 39. 



The specimen was unfortunately broken in the carriage from New 

 Zealand, and the part of the shell containing the ovarial pores was 

 destroyed. 



The upper and lower part of the shell is supported by compressed 

 perpendicular columns, about one-third the width of the disk ; near 

 the oral disk there are placed five pairs of short processes for the sup- 

 port of the jaws ; the jaws are triangular ; they agree, as does the 

 disposition of the spire, tubercle, and all the other external characters, 

 with the northern species as figured by Agassiz from the specimen 

 in the Museum collection. 



3. Remarks on the Genus Hapalotis. 

 By John Gould, F.R.S. 



With the view of correcting some errors respecting the members 

 of the genus Hapalotis, and of describing two new species, Mr. Gould 

 exhibited an extensive series of specimens, including several species of 

 this curious form of Rodent, from his own collection : ^dz. — 



