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in the middle with a very small spine accompanied by a likewise small bristle; 

 dactylar joint conical in form, with a minute spinule at the base. Natatory 

 legs resembling in structure those in the type species (P. gracilis) ; inner ramus 

 of 4th pair however of larger size and densely ciliated on both edges, the 

 outer one exhibiting in the middle a well-marked dentiform projection. Last 

 pair of legs, as in the other species of this genus, quite rudimentary, being 

 represented on each side by a short spine and 2 setae, all attached immediately 

 to the corresponding segment. 



Body, in the living state of the animal, very pellucid, of whitish colour, 

 with orange-colured intestine and light fuscous ovarial tubes. 



Length of adult female slightly exceeding 1 mm. 



Male unknown. 



Remarks. The most prominent peculiarity of the present species is 

 the composition of the tail of only 3 segments, in which respect it differs not 

 only from the other species of this genus, but from all the known Licho- 

 molgidae. The structure of the several appendages, however, is in full accor- 

 dance with that found in the genus Pseudanthessius, to which it accordingly 

 must be referred. In the very narrow and produced caudal rami it resembles 

 the form recorded by Brady as Lichomolgus Thorelli, and indeed at first I was 

 inclined to regard it as identical with that species. The structure of the caudal 

 segments, however, as also that of the last pair of legs, is, according to the 

 figures given by Brady of these parts, so totally different that an identification 

 of these 2 forms is inadmissible. 



Occurrence. Only a single female specimen of this form has hitherto 

 come under my notice. It was taken many years ago off the west coast of 

 Norway, the exact locality not being noted, and, after a coloured drawing was 

 made from the still living animal, it was submitted to a careful anatomical 

 examination. The figures here given are copied from the drawings made at 

 that time. 



Page 189. Add the following genus and species: 



Gen. Lichomolgella, G. O. Sars, n. 



Generic Character. General form of body somewhat resembling that 

 in the genus Machrocheiron. Tail however comparatively shorter and stouter, 

 with the genital segment (in female) rather massive and exhibiting behind 2 

 peculiar ventral lappets confluent in the middle. Anterior antennae unusually 



