205 



linguiform, not extending as far as the distal one, marginal setse rather elongated 

 and 6 in number. 



Male with the inner rami of the 2nd and 3rd pairs of legs peculiarly 

 transformed; that of 2nd pair provided at the end of the proximal joint with 2 

 juxtaposed knob-like prominences, that of 3rd pair biarticulate, distal joint termin- 

 ating in 2 slender spines forming together a kind of forceps. Last pair of legs, 

 as usual, much smaller than in female, inner expansion of proximal joint with 

 only 2 spiniform setse. 



Colour whitish. 



Length of adult female 0.71 mm. 



Remarks. This form was first described under the above name by Th. 

 Scott, and was subsequently recorded by Prof. Lilljeborg as a species of the 

 genus Canthocamptus, the genus Atihcyella being not accepted by that author. 

 It -is an easily recognizable form, being especially distinguished by the prominent 

 rostral projection and the comparatively large and thick caudal rami, the 2 outer 

 seta) of which are moreover unusually elongated. 



Occurrence. The only place where I have hitherto met with this species 

 is in the "Songsvand", near Christiania. It occurred in the northern part of this 

 lake, on a muddy bottom at a depth of about 3 fathoms. 



Distribution. Sweden (Lilljeborg), Scotland (Scott). 



Gen. 44. Morarla, Scott, 1893. 



Syn: Ophiocamptus, Mrazek. 



Generic Characters. Body slender, cylindric in form, and very flexible, 

 with the segments rather sharply defined. Cephalic segment produced in front to 

 a distinctly prominent rostral projection. Anal opercle smooth, angularly pro- 

 duced behind. Caudal rami rather large, oblong in form, with 2 slender bristles 

 outside, apical setse comparatively short. Anterior antennse in female 7-articulate, 

 the terminal part being only composed of 3 joints; those of male strongly hinged. 

 Posterior antennas rather stout, with the outer ramus very small and uniarticulate. 

 Mandibular palp likewise small, biarticulate. Maxillae and maxillipeds about as 

 in Canilwcamptus. Legs very short, with the natatory setse imperfectly developed, 

 1st pair not much different in structure from the 3 succeeding ones, inner ramus 

 of the latter biarticulate and much shorter than the outer, being only slightly 



27 Crustacea. 



