Dr. R. Bergh on Ismalla 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 Ismaila. 



ISMAILA, Bgh., n. g. 



Fosmina. — Cephalothorax distinctus. Duo antennarum paria ; an- 

 tennae priores minut£e ; posteriores paullo majores, prensoria. Ab- 

 domen supra in tria segmenta di visum, 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 praedita. 

 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 Ism. monstrosa^ n. sp. 



Dr. Bergh has observed the 8pl. hrevipes^ Hanc. & Norman 

 ( ? ), in a new species oiGalvina from the Kattegat, G. viridulaj 

 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. pi. 47. figs. 25-27), but 

 which seems to be found in all species of Galvina. 



EXPLANATION OF PLATE I. 



Fiy. 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 It/ncem, 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 ; h, gangl. cerebroviscerale -, c, gangl. 



pediseum; d, gangl. buccinatorium ; «, commissura pedia^a; 



^, comm. visceralis (brauchialis) ; y, commissura buccalis ; 



8, 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 gronlandica, Ch., with the 



round bodies resembling eyes. 

 Figs. 12 ^- 13. Small bodies resembling eyes. 



