896 Transactions.— Zoology. 
of the first joint produced so as to form à very prominent point, almost 
a spine; claws half the length of preceding joint; whole animal destitute 
of hair, except on the fingers. Length, $in.; breadth, $in. First three 
pairs of ambulatory legs very long, more than twice the length of the 
carapace. 
Hab; Wellington. 
Petrolisthes elongatus, Miers. 
In the ‘ Catalogue of New Zealand Crustacea,’ p. 60, this species is said 
to be of a *'reddish-yellow " colour. The specimens from which the 
description was drawn up must have been preserved in spirit. This change 
of colour is usual in specimens so treated, The following is taken from 
living examples. 
Above dark blue, greenish-blue, or sometimes even black. Below green, 
getting much darker towards the posterior margin of the anterior legs, 
anterior face of wrist a bright red, mobile finger and antenns deep brown, 
Porcellana rupicola, Stimpson. 
zm A single specimen of this species was 
recently obtained by myself at Lyall Bay, 
living apparently upon terms of intimacy 
with a large family of Petrolisthes elon- 
gatus. Upon a comparison with the foreign 
Crustacea in the Colonial Museum, I find 
it to agree in every particular with a 
Specimen contained in the collection 
lately received from Prof. Button of the 
University of California, and labelled as above. 
Unfortunately I have not been able to obtain the description either of 
this or the next species, but there can be no doubt respecting their identity, 
as those forwarded by Prof. Button are duplicates of the U.S. Exploring 
Expedition's collection. 
This species may be easily distinguished from Petrolisthes elongatus by its 
having the posterior margin of the wrist produced, so as to form one strong 
tooth, by its more drooping front, and by having the lateral margins 
obtuse instead of thin and sharp. Length, 3 in.; breadth, 4 in. 
Xantho spino-tuberculata, Lockington. 
A fine pair of this beautiful little crab was procured at Porirua Harbour, 
in January of last year, and although only about half the size of the Cali- 
fornian specimen, there can be'no mistaking their identity. 
The carapace is much broader than long, the front armed with spinous 
tubercles; regions well defined; anterior legs strong, equal, the outer and 
