SlucJics on iiiaiiiie Oslracods 4U( 



A. Midlcri. 



., van lorujiseta. 

 ,, Ohlini. 



The form A. curta described below also seems to be closely related to this group. In some 

 characters, however, it occupies a special position: 



Female: — First antenna: — On the anterior side of the third joint there are 

 only five bristles (six in the former species). M a n d i b 1 e: -- The backward pointing process 

 on tlie second protopodite joint has two dwarf bristles. The seventh limb has more than 

 twelve bristles; the teeth of the end combs are evenly and finely pectinated. Male: — The 

 firs t a n t e n n a has only six sensorial filaments on the sensory bristle of the fifth joint. 



For the relation to this group of the following species not investigated by me see pp. 488 — 490, 

 the remark under ^. Mi'dleri: Cypridina teres, A. M.l^omi as, 1861, Cylindroleberis teres, G.fi.Bl<MJ\ , 

 1868 b. Asterope oblonga och ovalis, C. Claus, 1876, Cijlindroleheris teres, G. W. Mt'LLKlJ, 1894, 

 Asterope teres, G. S. Brady and A. M. NORMAX, 1896 and A. oculata, G. S. BRADY, 1902 a. 



A. glacialis is very closely connected to A. curta; cf. the remark under the latter species. 



Grimaldi group: 



Female: — S li e 1 1: — Seen from the side it is more or less elongated, with the 

 posterior and anterior parts of about the same height. 



First antenna: — The sensory bristle of the fifth joint has seven sensorial fila- 

 ments. Its end joint has only six bristles, as of the d- and e-bristles only the latter is well deve- 

 loped, the d-bristle being represented only by a very small verruciform process. 



Mandible: — Protopodite: First joint: The rod-shaped process of the endite 

 has three short powerful spines distally. Second joint: The backward pointing process: The 

 triaena bristles have rather few (from two to five pairs) of secondary spines proximally of 

 the distal pair. Two dwarf bristles are developed on this process. On the middle of the 

 dorsal side of this joint there is usually one, but sometimes no or two bristles. Endopodite: 

 The second joint has one proximal bristle and has no long, narrow bristle, with fine, short 

 hairs, between the main bristles b and c. 



Seventh limb: — This has twelve cleaning bristles, six of which are situated near 

 the point of the limb, three on each side, and six somewhat proximally of these, three on each 

 side. The teeth of the end combs are evenly and finely pectinated. 



The median eye is bare. 



Male: — The first antenna has numerous sensorial filaments on the sensory bristle 

 of the fiftli joint. For other examples of dimorphism see the descriptions of the species. 



The following species of those investigated by me belong to this group: 



A. Grimaldi 

 „ ,, var. vicina 



,, oculata 



,, norvegica. 



A. abyssicola is also very closely related to this grou]i. It dift'eres from it, however, in 

 a number of characters: Mandible: — Tlie second endopodite joint has two proximal 



