140 



Male somewhat more slender than female, and having the last segment 

 of metasome conspicuously asymmetrical, right lateral lobe much larger than left, 

 and produced to a slender, somewhat inflexed process. Urosome much narrower 

 than in female, and, as usual, 5-articulate, 1st joint on right side produced in a 

 triangular projection, the 2 succeeding segments slightly asymmetrical. Caudal rami 

 much more elongated than in female, and nearly equal. Ventral eye of extraordinary 

 size, sub-pedicellate or club-shaped, extending obliquely anteriorly, its broadly 

 rounded end being received between the rami of the rostrum. Right anterior 

 antenna with the middle section bulbously tumefied in its proximal part, and 

 carrying a slender spine pointing obliquely inwards, the last 2 joints of this 

 section attenuated, and each 1 provided in front with a finely serrate lamella. Last 

 pair of legs without any trace of an inner ramus, left leg with the terminal joint 

 comparatively small, incurved, projecting at the tip to a short claw, and carrying 

 3 small spines outside; right leg with the chela sub-quadrangular in form, thumb 

 very small, dactylus somewhat spoon-shaped. 



Colour. Body generally of a fine bluish green colour, with a number of 

 irregular dark patches on the dorsal face of the anterior division arranged in a 

 double row, 1st and 2nd pedigerous segment each with a median dorsal pigment- 

 star, consisting of a dark nucleus and numerous radiating fibres of a silvery 

 hue; ventral eye indigo blue. 



Length of adult female 3.20 mm., of male 3.00 mm. 



Remarks. This handsome Calanoid was first described under the above 

 name by Templeton, and was some years afterwards recorded by Goodsir under 

 another name, viz., Irenceus splendidus. Kroyer referred the species to the genus 

 Pontia uf Milne-Edwards (= Pontella Dana). It is an easily recognizable form, 

 and perhaps one of our most beautiful Calanoids, being clearly distinguished both 

 by its unusual colouring and the very full development of the visual organs, 

 especially in the male. 



Occurrence. I have met with this form in several places, both off the 

 south and west coasts of Norway, generally congregated in great shoals. The 

 true habitat of this form, however, is undoubtedly the open ocean, and it is only 

 after heavy gales, and by the accompanying strong sea-currents, that it is occa- 

 sionally brought close to the shores and into the fjords. Under such circum- 

 stances I have found it rather plentifully at the Biological Station at Dr0bak, 

 and sometimes even in the uppermost part of the Christiania Fjord, close to the 

 town. Off the west coast of Norway, where it is known to the fishermen as 

 "Blaaaate" (blue bait), its presence in the fjords is a very good sign of the ap- 

 proach of the summer-herring. It is always found swimming close to the surface of 



