126 



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. 



4. 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 : viz. — 



1. Hapalotis albipes, Licht. 



2. Hapalotis apicalis, Gould, n. s. 



This new species is about the size of, and similar in colour to, 

 H. albipes, but it has larger ears, and its feet, which are perfectly 

 white, as in that animal, are much more dehcately formed, and the 

 tail is nearly destitute of the long brushy hairs towards the tip ; the 

 eye is also much smaller. 



Face and sides of the neck blue-grey ; upper part of the head, space 

 between the ears, the ears and upper parts of the body, pale brown 

 interspersed with numerous fine black hairs ; under surface white ; 

 flanks mingled grey and huffy white ; fore feet white, with an ob- 

 hque mark of dark brown separating the white from the greyish 

 brown of the upper surface ; hinder tarsi and feet white ; basal three- 

 fourths of the tail brown, apical fourth thiuly clothed with white 

 hairs. 



