155 



long, and somewhat obliquely truncated at the tip, setae normal. Anterior an- 

 tennae rather slender and attenuated, 8-articulate, 4th joint considerably longer 

 than 3rd, and about equal in length to the 2nd, terminal part nearly half as 

 long as the proximal one. Posterior antennae with the outer ramus of moderate 

 size, middle joint well defined and setiferous. 1st pair of legs rather slender, 

 outer ramus slightly exceeding half the length of the inner, and, as in the 4 pre- 

 ceding species, having the middle joint much larger than the others, last joint 

 small and armed with 3 claw-like spines and 2 geniculate setae inside the latter; 

 inner ramus with the 1st joint very slender, the other 2 quite short, subequal, 

 and as a rule bent outwards at nearly a right angle with the 1st, last joint 

 armed with a strong, distinctly pectinate claw and a slender geniculate seta inside 

 it. Natatory legs very slender, otherwise of normal structure. Last pair of legs 

 with the distal joint of moderate size and broadly ovate in form, with 6 not very 

 elongated marginal setae; inner expansion of proximal joint rather large, extend- 

 ing considerably beyond the middle of the distal joint, marginal setae 5 in number 

 and rather strong. Ovisacs comparatively large, extending to the end of the 

 urosome. 



Male having the anterior antennae transformed in the usual manner. 2nd 

 basal joint of 1st pair of legs forming, inside, 2 strongly chitinized dentiform pro- 

 jections in addition to the usual spine, which latter does not exhibit any differ- 

 ence from that in the female. Inner ramus of 2nd pair of legs with 2 closely 

 juxtaposed spiniform appendages outside near the tip, the latter unarmed. Last 

 pair of legs with the distal joint much smaller than in female, and sub-cordate in 

 form; inner expansion of proximal joint with only 2 unequal marginal setae. 



Colour whitish, with a slight rosy tinge. 



Length of adult female 0.64 mm. 



Remarks. The above-described form is unquestionably identical with that 

 recorded by Prof. Brady as Dactylopus minutus, Glaus. The description and 

 figures given by Glaus are certainly very scanty; but I believe that there is no 

 reason to doubt the correctness of Prof. Brady's identification. The form recorded 

 by Boeck as Diosaccus dbyssi is this species, and this is also evidently the case 

 with the form described by Th. Scott from Franz Josef Land as Dactylopus 

 lonyirostris Glaus. The present species is easily distinguished from any of the 

 4 preceding ones, both by its much inferior size and by the structure of the 

 anterior antennae and 1st pair of legs. 



Occurrence. I have found this form occasionally in the Christiania Fjord, 

 as also off the south and west coasts of Norway in moderate depths among algae. 



