By Mr. ANDREWS. 28 
tenuirostris, taken to the British Museum, the wrist has the form 
attributed to that species, and in the other, that attributed to 8S. 
phalangvum.” IJadvance those points as in remarks on other 
genera. I may have grounds for more strongly objecting to 
‘specific distinctions, made upon equally slender foundations. 
S. phalangvum is more robust, and larger than the described 
S. tenuirostris, and more frequently found in the weedy grounds 
of harbours and estuaries, while the other is more generally met, 
in clearer ground and deeper water. The former is very abundant 
in Dingle and Valentia harbours, the latter off the islands, and 
in the deeper water of the bay. ound in clear ground S. 
tenuirostris, is often of a beautiful pink or rose colour. Couch 
mentions having obtained it in twenty fathoms on the Cornish 
coast, but that he had never met S. phalangiwm. 
The genus Achcwus, of which but one species is known, was 
first found by J. Cranch, in Falmouth Bay, and named Cranchii 
by Dr. Leach, after that distinguished collector, who perished in 
the Congo expedition. Nothing at present can be admitted of 
its claims as Irish, no authenticated specimen existing in any 
Museum in this country, at least that can be decided as such, In 
the list of crustacea of the Royal Dublin Society, published in the 
Journal, July, 1856, achwus is mentioned, but no specimen is in 
the Museum. Dr. Kinahan stated in proceedings of the Natural 
History Society, April, 1857, “that a single specimen was obtained 
in Antrim, 1850; the only previous record of it as Irish, was a 
specimen formerly in the collection of J. V. Thompson, but some 
years past lost.” It is difficult to agree to the certainty of species 
when no means of examination exist. In deep water among 
broken shells and weeds in the Blasket sound, I obtained several 
specimens of a crustacea which might have been considered near 
to acheus, particularly in the outline of the carapace, and the fal- 
cate or sickle-like form of the tarsi. The tubercles on the carapace 
are similar to achwus, but there are other outlines that show 
affinities both to Pisa, and to Hyas, especially to the latter in the 
contraction immediately behind the post orbitar process. The 
anterior portion of the carapace is much broader in Hyas than 
in the specimens that I had obtained, and the first pair of legs 
are considerably longer in Hyas, However, no identity with 
acheus can be confirmed, 
