Dr. R. Bergh on Ismaila monstrosa. 137 
of which both sexes are known, it must always be care- 
fully borne in mind that such arrangements are only provi- 
sional, and can only be definitely settled when the males shall 
have been examined.” Nevertheless he ventures, with all 
due reservation, to give a generic character of the new para- 
site found in the Phidiana, and which he calls Zsmaila. 
IsMAILA, Bgh., n. g. 
Foemina.—Cephalothorax distinctus. Duo antennarum paria ; an- 
tenn priores minute ; posteriores paullo majores, prensoria. Ab- 
domen supra in tria segmenta divisum, ultimum in appendicem 
erectam productum; segmenta omnia utroque latere in brachium 
elongata ; duo priora segmenta inferiore pagina, pedum abdomina- 
lium loco, duobus paribus brachiorum inter sese similium preedita. 
Cauda elongata, apice solum articulata, ultimo segmento appendicibus 
caudalibus brevissimis setigeris. 
Mas ignotus. 
The mouth was furnished with a very powerful pair of 
mandibles. ‘The species is called sm. monstrosa, n. sp. 
Dr. Bergh has observed the Spl. brevipes, Hance. & Norman 
( 2 ), in anew species of Galvina from the Kattegat, G. viridula, 
Bgh.; a specimen of G. rupium yielded another parasite, 
namely an oceanic Acaride, of which some very few have been 
observed before. Having on a former occasion given a less 
accurate description of the rasp in Galvina rupium, the 
author now supplies the deficiency by an accurate drawing 
showing a peculiar depressed position of the apex, which is not 
seen from above, and therefore not observable in the figures 
given by Hancock (Monogr., suppl. pl. 47. figs. 25-27), but 
which seems to be found in all species of Galvina. 
EXPLANATION OF PLATE I. 
Fig. 1. The rasp of Phidiana inca, D’Orb., from the side. 
Fig. 2. A dental plate of the same, from underneath. 
Fig. 3. A part of the rasp of Phidiana lynceus, Bgh., from the side. 
Fig. 4. A dental plate of the same from above obliquely. 
Fig. 5. The apex of a rhinophore of the same. 
Fig. 6. The middle dental plates of Galvina rupium, Moll., from the side. 
Fig. 7. The same, from above. 
Fig. 8. The central part of the nervous system of Phidiana lynceus: 
a, ganglion olfactorium; 6, gangl. cerebroviscerale; c, ganel. 
pedizum; d, gangl. buccinatorlum; «#, commissura pediwa ; 
B, comm. visceralis (branchialis); y, commissura buccalis; 
6, comm. sympathica. 
Fig. 9. The larger eye of Phidiana lynceus. 
Fig. 10. The smaller eye of the same. 
Fig. 11. The epipodial margin of Margarita grénlandica, Ch., with the 
round bodies resembling eyes. 
Figs. 12 § 13, Small bodies resembling eyes. 
