7D Notes on the Ivish Crustacea. 
whose names I have mentioned. The collections of J. VY. Thomp- 
son, of Cork,* neither, I regret to say, are those of Dr. Kinahan, 
myself, and others, now to be seen in the collections of the Natural 
Uistory Society of Dublin, though the reports of that society 
show in detail, that nearly a perfect collection of Decapoda were 
carefully arranged, numbering fifty-eight species (one hundred 
and nine specimens), besides of genera and species of other orders, 
nor indeed, have authenticated specimens been preserved in our 
museums, illustrative as records of discoveries that had been made 
of several species of Irish crustacea; hence it must appear de- 
sirable that so interesting a branch of our marine zoology should 
meet attention to place it in a proper position, and to add any 
additional information of species not hitherto described in our 
marine fauna. It is not necessary, neither is it the intention, to 
enter into details of structural formation, nor of the science of 
component parts, but merely to notice some characteristics which 
may have led to, or confused specitic distinctions. 
In the present paper I shall confine myself to the First Order 
— Decapoda, which comprises the sub-orders Brachyura, Ana- 
moura, and Macroura. Treating on the first sub-order, Brachy- 
ura, in which the abdomen is slightly developed, and of no force 
or assistance in swimming—generally much wider in the females 
than in the males—the remarks as far as necessary will be on 
the several genera and species, known on the Irish coasts. 
Family First, Macrapodiade, Dr. Milne Edwards charac- 
terized by the extreme length of their slender legs. The first 
of the genera is Stenorhynchus, of which only one species is in the 
lists of Irish crustacea. 
S. phalangiwm.—Though another is described as British S. 
tenurrostris, the separation from the former is made upon such 
slight variations, that I must fully concur in the views of the late 
William Thompson, who carefully compared those obtained by 
him in Ireland, with the specimens described by Leach and Bell, in 
the British Museum. ‘The two presumed species presented varied 
differences of spinous processes, and as Thompson further remarks, 
“that in one of the two Irish examples of what I have called S. 

* Purchased by the Royal College of Surgeons, and subsequently presented by the 
College to the Royal Dublin Society, were not, at the time they were given over to the 
Society, complete, 
Also the collections of William M‘Calla, obtained by Dr. Scouler for the Society, are 
not to some extent forthcoming. 
