69 



large, far exceeding in length the body of the mandible, ranii however of very 

 unequal size, the inner one being much the larger and fully twice as long as the 

 basal part, proximal joint of this ramus imperfectly defined and without any setae, 

 distal joint oblong oval in form, and provided with 5 coarse setae, one of which is 

 attached to the outer edge, the other 4 to the obtusely rounded extremity; outer 

 ramus attached close to the base of the inner, and forming a small triangular lamella, 

 edged with 3 plumose setae. Maxillae with the masticatory lobe comparatively 

 small, with a restricted number of spines; endopodal part with 2 comparatively 

 short setse inside the base, terminal joint imperfectly defined and edged with 

 3 similar setae; exopodal lobe obsolete and replaced by 3 short setae attached 

 to the outer nearly straight edge of the palp, which is produced both prox- 

 imally and distally to a small knob-like prominence. Anterior maxillipeds with 

 the basal part imperfectly subdivided, and. exhibiting inside 5 digitiform lobes 

 and as many curved setae; terminal part small, uniarticulate, with a minute 

 apical spine and a densely ciliated seta outside the base. Posterior maxillipeds 

 composed each of a very large and massive basal part divided into 2 segments, 

 and of a comparatively short, but very mobile biarticulate dactylus curved in- 

 wards. The 4 anterior pairs of legs much reduced, with both rami quite 

 short and uniarticulate, the outer one narrow triangular in form, with the inner 

 edge perfectly smooth, the outer armed with 5 somewhat unequal spines; 

 inner ramus rounded oval in form and fringed with thickish, sparingly ciliated 

 setae, the number of which is somewhat varying in the different pairs. Last 

 pair of legs far less produced than in the other species, and attached to the 

 sides of the posterior part of the trunk, somewhat nearer the dorsal face; 

 each having the form of a narrow lanceolate lappet carrying on the tip a 

 rather strong curved seta accompanied by 2 much smaller bristles, another 

 still smaller bristle occurring on the upper edge somewhat beyond the middle. 

 Only a single comparatively large globular ovisac present, attached to the 

 dorsal face of the genital segment. 



Body in the living animal of a pale reddish orange hue, with the ovarial 

 tubes and the ripe ova bright green in colour. Length of adult female 1.70 mm. 



Male unknown. 



Remarks. The above-described species may be easily distinguished from 

 any of the other forms recorded by the quite unsegmented anterior division 

 of the body, as also by the poor development of the legs. 



Occurrence. Some few female specimens of this form were found, many 

 years ago, within the body cavity of a species of Botryllus, taken at Espevaer, 

 west coast of Norway. 



10 Crustacea. 



