some deeply emarginatecl behind, and almost wholly encompassing laterally the 

 small last segment. Urosome not attaining half the length of the anterior division, 

 genital segment slightly dilated in its anterior part, and exceeding in length the 

 remaining segments combined. Caudal rami broader than they are long, and 

 transversely truncated at the tip, apical setse rather elongated and densely plu- 

 rnous, the innermost but one fully half as long as the whole body. Anterior an- 

 tennse about the length of the cephalic segment, and consisting of 16 articulations, 

 the 3 proximal of which are considerably dilated and densely clothed with partly 

 ciliated setse. Last pair of legs with the 1st joint conically produced at the end 

 inside, and carrying on both edges a ciliated seta, that of the inner corner rather 

 elongated and deflexed; 2nd joint somewhat smaller, and obliquely produced out- 

 side, with a long seta at the outer corner; last joint oval in form and carrying 

 on the tip a lanceolate, denticulated spine and a slender seta, outer corner pro- 

 duced to a small dentiform projection. Ovisac small, rounded, and containing a 

 very limited number of large globular ova. 



Male considerably smaller than female, with the anterior division of the 

 body less expanded. Genital segment considerably dilated, and generally contain- 

 ing on each side a large, oval spermatophore. Anterior antennse composed of 

 only 13 articulations, basal section considerably dilated and 5-articulate. with 

 several well-developed sensory appendages in front; middle section very sharply 

 defined from the basal one, narrow fusiform, and consisting of 6 articulations; 

 terminal section biarticulate. Last pair of legs scarcely different from those in 

 female. 



Colour whitish, with a pale reddish tinge. 



Length of female 0.70 mm., of male 0.55 mm. 



Remarks. This peculiar Copepod may be easily recognized from any of 

 the other Harpacticoida, its external appearance deviating, indeed, considerably 

 from the ordinary type, and more resembling that in forms belonging to quite 

 different divisions of the Copepoda. It is unquestionably the most anomalous 

 form of the whole group. 



Occurrence and Habits.- I have found this interesting form occasionally 

 in several places off the west coast of Norway, in depths varying from 20 to 50 

 fathoms, sandy bottom. Last summer, a single female specimen was captured in 

 the Trondhjem Fjord, near Agdenaes, in about 50 fathoms. The solitary specimen 

 examined by Boeck, was taken at Skudesnses, west coast of Norway. 



The animal moves in a manner very similar to that observed in some 

 of the deep-sea Calanoids, for instance Stephos and Pseudocydops, now proceeding 

 quite slowly in a somewhat rotatory manner produced by rapid vibrations of the 



