676 iwr.K sKonsHKur. 



S. -J-)!). S. A. !•;.. I'l. station (i 1), lat. '-'S" 35' X., luii.ii. L'-J" lit' W'.; at the suilacf; lo. Xl. 

 l;u»l; temperature, 23,0" C: I mature male. S. A. K., IM. station S I), lat. -21" 51' X.. long. 

 23".() \V.; at the surface; 11. XI. l!»(il: temperature, 23,2" C: 1 mmHhc i'cinale; H. M. S. 257. 

 S. A. K.. IM. station 20 b. lat. 1 1" it' S., long. 32" 55' W.; at the surl'acr; :>!». XI. l!»(il ; Irinpcratun', 

 2().4" ('. : 2 mature females ami 3 juvenes; R. M. S. 25S. 



Lat. 2t>" 15' N.. long. 20" 50' \V.*; Vll. 1895; collector Chr. Levinscn: I inatuic lemalc (delincd 

 liv (J. S. liu.MiV. li)02a as C.spinirostris: sec below p. 708). Stored in the collections of K. Z. M. 



Lat. 42»09' X., long. 42" 15' \V.; 17. 111. iSltS: I male juvcnis (length, 1,4 nun.); 

 K. .M. S. 383 (^- V. T. Cle\Ti:'s material, 1900). 



Distribution: — Atlantic Ocean from aboui lat. 42" N. (P. T. Clfak, 1900) to lat. 32" N. 

 (C. Cl.\US, 1891 a). 



All the stations of the Swedish „A n t a r c t i c" Expedition are consequently situated 

 south of the distributional area of this species as stated by previous authors. 



Gaussi group n. 



Besides the species dealt with below, which has given the group its name, only C. incisa 

 G. \V. MUller, out of the species of this genus hitherto described, seems to belong to this group. 

 Unfortunately on account of the incompleteness of G. \\\ MtJl-LER's description of C. incisa 

 it is impossible as yet to make a detailed diagnosis of this group. The most striking character 

 in this group is the occurrence of a large compound gland on both valves at about the middle 

 of the ventral margin of the shell. There is no such gland in any of the other species so far known 

 of this genus. There are no c- and d-bristles on the endopodite of the female second antenna. 



G. W. MUller in his work of 1906 a included C. incisa provisionally in the Bispinosa 

 group. „Verwandt diirfte der Gruppe C. incisa sein, und mag diese Art hier ihren Platz finden." 

 This writer was supported in this view by his investigation of C. Gaussi. He writes on this 

 point (1908, p. 72): ,,Die Richtigkeit dieser Anschauung wird durch die Untersuchung von 

 C. Gaussi bestatigt, da diese Form die fiir diese Gruppe charakteristischen Merkmale, Ver- 

 groBerung einiger medialer Driisenzellen des Hinterrandes, auffallige Entwicklung einer lateralen 

 Borste des zweiten Gliedes des Innenastes der zweiten Ant. zeigt, allerdings weniger auffallig 

 als bei den typischen Formen. Am Hinterrand findet sich nur eine kleine Gruppe von Zellen, 

 und diese Zellen scheinen nicht groBer als die benachbarten . . . die langere laterale Borste 

 ist nicht langer, sondern nur so lang wie das zugehorige Glied, aber immerhin langer als bei 

 den anderen Arten der Gattung Conchoecia, aucb ist sie viel langer als die neben ihr stehende. 

 Man beachte auch die Bewaffnung der Nebenborsten der ersten Antn." The similarities pointed 

 out by this writer are obviously not of a specially far-reaching natiire. But it seems to me 

 rather probable that C. Gaussi and C. incisa are fairly closely related to C. bispinosa. The 



* Not 29" 56, W., a.s is stated by G. S. Bradt. 



