144 DUBLIN UNIVERSITY 



Parcellana platychcles. — In about equal abundance as at Dublin and 

 Valentia. 



Porcellana longicomis. — Bather rare ; very common in Dublin and Va- 

 lentia. 



Portunuspuler. — Much commoner than in Dublin, and about as common 

 as in Valentia. 



Portunus arcuatus, so common as a littoral species in Valentia, not 

 found here as such, while the following, which are common in 

 Dublin, were not met with : — Palcemon squilla, PCippolyte varians,* 

 H. Cranchii* Xantho florida, also a common littoral species in Va- 

 lentia, does not occur here, except in deep water, and I was told was 

 nowhere abundant along the coast. Can this be a Lusitanian form ? 



To one who had never explored these southern shores the extreme 

 littoral zone furnished a most remarkable sight : — Several species of 

 Tunicata regularly festooning the rocks and squirting water over you at 

 every step ; — great bunches of a sponge (Grantia compressa ?) and of 

 Polyzoa overhanging every nook and cranny, which were lined with a 

 cirriped ( Chthalamus punctatus), not found in Dublin, as far as my know- 

 ledge goes; — and, to make the scene more striking in every sense, the 

 rock bored on every side by colonies of Saxicava rugosa, all contributing 

 their share to the involuntary shower-bath which the adventurous ex- 

 plorer was compelled to undergo in his researches after the treasures of 

 this shore. I regretted that the short time at my disposal precluded my 

 examining more fully the species found here. Idoteas were rare as 

 contrasted with Dublin; there were but few pools suited for them. 

 I met Bex amine spinosa, Gammarus locusta, Amphitoe littorina, in 

 abundance. 



Accompanied by my host, I took a short trip into Cornwall, as far as 

 Polperro, passing through Millbrook, Craft's Hole, and Looe. 



Many features of the Botany were remarkably striking. The im- 

 mense profusion of Asplenium Adiantum nigrum, which, interspersed 

 with Lophodium affinis and Scolopendrium vulgare, completely swathe 

 the steep hedge-rows of the district, unlike anything I had ever seen in 

 Ireland, except in the county of "Waterford. The profusion of plants, 

 either unknown as indigenous in Ireland, or else extremely rare, such 



* Both_ these species occur not uncommonly elsewhere in this district. 



