On the Lysianassa magellanica etc. 19 



lias been already described, and of the genus Acidostoma full details vill 

 be given in the sequel. 



The genus Tiron x ) is typified in a species, found by us at Christian- 

 sund in Norway at a depth of 30 to 40 fathoms, which we in our public 

 lectures have called Tiron acatithnrus. n. sp. 



Forma capitis ex parte cum eadem gen. Oediceri congruit, antennae 

 superiores vero flagello appendicular! longo sunt praeditae, et pedes trunci 

 7:mi paris longitudine pedes anteriores aequant, et breves, crassi et unguiferi 

 sunt. Pedes trunci l:mi et 2:di paris graciles, ungue tamen non flexibili 

 instruct! Segraenta caudalia superne in medion lungitudinalitcr carinata, 

 carina ad marginem posteriorem segmcntorum in aculeuin, qui in segnicntis 

 4:to et 5:to niagnus est, et adliuc in segmento 6:to observatur, excurrente. 

 Antennae superiores longitudine pedunculo antennarum inferiorum ajquales. 

 Frons aliquanto producta, basin antennarum superiorum obtegens, rostro 

 brevi sed acuto. Oculi rubri. Longitudo circ. 10 milliin. 



The genus Oediceropsis is also typified by a single species, found by 

 us in the sea off Moldc in Norway at a depth of 40 or 50 fathoms, which 

 we in our public lectures have called Oediceropsis brevicornis n. sp., the upper 

 antennae being particularly short. 



Forma corporis eidem gen. Oediceri valde similis, caput tamen rostro 

 caret, et pedes trunci 7:mi pans, qui longuin et rectum ungucm habent, et 

 longi et graciles suut, tamen pedibus anterioribus (j:ti paris non duplo — 

 circ. sesqui — longiores sunt. Antennae superiores non finem articuli pen- 

 ultimi pedunculi antennarum inferiorum assequuntur, et flagello appendicu- 

 lar! carent. Antennae inferiores magnae, fere pediformes, articulo penultimo 

 pedunculi ceteris majore et ad apicem infra setam magnam gerente. Oris 

 partes appendiculares et hujus et anterioris speciei structura solita. Pedes 

 trunci l:mi et 2:di paris forma inter se similes, manu subeheliformi, ovali, 

 carpo postice aliquantum producto. Pedes trunci 3:tii et 4:ti paris parvi 

 et graciles. Segmentum candale 7:mum integrum et parvum sed lammare. 

 Pedes caudales ultimi ramis duobus angustis, fere aequalibus. Color flave- 

 scens; oculi rubescentes, sed parum visibiles. Longitudo circ. 8 millim. 



To the genera Microplax , Odius and Calliopius we have given new 

 names instead of the names Iduna, Otus and Calliope, which had already 

 before been given to other animals. 



') Tu'owv Proper name. 



