62 



with the last joint spiniformly produced ; those in male very large, both legs well 

 defined and angularly curved near the base, the right one 4-articulate, terminating 

 ist a more or less claw-like piece, left 5-articulate, with the penultimate joint 

 much tumefied, last joint incurved and provided with a number of delicate leaf-like 

 appendages. 



Remarks. As above stated, this genus was first (in the year 1892) 

 established by Th. Scott, to include a small Calanoid found by him off the Scot- 

 tish coast, S. minor. In the same year, but somewhat later, Dr. Giesbrecht 

 described a Mediterranean form, undoubtedly belonging to the same genus, under 

 the name of Moebianus gyrans. and a 3rd species was subsequently recorded by 

 Th. Scott as .S. Fultoni. I have myself observed 2 additional species off the 

 Norwegian coast, to be described below. The genus accordingly comprises at 

 present 4 different species. In all these species the last pair of legs in both 

 sexes are built upon the very same type, though those of the male, at any rate, 

 exhibit characteristic differences in each species. 



25. Stephos lamellatus, G. 0. Sars, n. sp. 



(PI. XLI & XLII). 



Specific Characters. Female. Body very short and robust, more so than 

 in any of the other species, with the anterior division, seen dorsally, broadly oval 

 in form, greatest width exceeding half the length, anterior extremity narrowly 

 rounded, posterior slightly contracted and somewhat irregular; seen laterally, 

 moderately vaulted above, dorsal margin forming, in front, a perfectly even curve. 

 Last segment of metasome deeply emarginated in the middle, lateral parts lamellarly 

 expanded and conspicuously asymmetrical, right lamella much larger and broader 

 than left. Urosome very short, scarcely attaining y 3 of the length of the anterior 

 division, genital segment asymmetrical, exhibiting on right side a rounded lamellar 

 prominence, but without any spiniform processes. Caudal rami scarcely longer 

 than they are broad, apical setae exceeding in length the urosome. Anterior 

 antennse rather slender, reaching, when reflexed, to the base of the caudal rami. 

 Posterior antennse with the outer ramus only slightly longer than the inner. Last 

 pair of legs with the terminal joint nearly straight, carrying outside, at some 

 distance from the base, a small spinule, distal part spiniform and very finely 

 ciliated outside. 



Male resembling the female both in size and general form of body, but 

 having the lateral parts of the last segment of metasome symmetrical and not 

 lamellarly expanded. Urosome somewhat narrower, and, as usual, composed of 



