22 Eev. T. R. R. Stebbing on Crustacea. 



figures of nine species of Dichelaspis, eight of which are 

 distinct from those above-mentioned. The first in liis list is 

 Dichelaspis Warwichii (Gray), of which he records the 

 occurrence in the Java Sea at Batavia, on the underside of 

 the cephalotliorax of Limulus moluccanus. Incidentally he 

 notes that the Mediterranean Dichelaspis Daricinii is found 

 on Palinurus vulgaris. Of his own species, Dichelaspis cor, 

 1892, Dichelaspis angulata, Dichelaspis aperfa, Dichelaspis 

 cuneata have only three valves, the terga being absent, while 

 his Dichelaspis hullafa, 1892, has only two valves, for here 

 the terga and carina are wanting-, as well as the basal segments 

 of the scuta. Dr. Aurivillius gives reasons for not 

 establishing new genera to suit the differences of structure 

 exhibited by these species, and for retaining the name Diche- 

 laspis, although its meaning is obviously inapplicable to a 

 species in which the scutum is not divided. It will, how- 

 ever, be very difficult to uphold the name in cases where its 

 meaning does not apply, in face of the fact that Darwin 

 displaced older names on the very ground that they were 

 suggestive of error. The three other new species are all from 

 the Java Sea, and from the bi-anchite of a Palinurus. The 

 first, Dichelaspis alata, is near to Dichelaspis Warwickii, 

 the second, Dichelaspis sinuata, to Dichelaspis Lowei, the 

 carina terminating in a large fork, in which respect the third, 

 Dichelaspis trigona, agrees with it. 



English Terrestrial Isopods. 



In an interesting paper on "The Irish Woodlice" Dr. ScharfF 

 has recently recalled attention to the terrestrial Isopoda of the 

 adjacent island as well as to those of Ireland itself. Of seven- 

 teen British species he remarks that " twelve are common to 

 Great Britain and Ireland, two are found in Great Britain 

 and not in Ireland, and three in Ireland and not in Great 

 Britain, so that the fauna of Ireland, though poorer in many 

 respects than that of Great Britain, is richer in woodlice by 

 one species." In justice to England, however, it must be 

 noted that Dr. Scharff has overlooked its recorded possession 

 of Metoponorthus cingendus (Kinahan). This species has 

 been found by more than one observer in South Devon ; 

 and by taking it into account the numbers of the land 

 Isopods on the opposite sides of St. George's Channel are 

 exactly balanced. But England is, in fact, richer in this 

 group than its past record siiows. Several years ago I ob- 

 tained at Ventnor, in the Isle of Wight, a specimen of Forcellio 

 dilatatus, Brandt, which I have now had the opportunity of 



