45S TAr.H sui)(isi;i:i!(! 



alumt four to ttMi such lonji tcrtli wciv obsorvcd. scattered, situated at ahout e(|ual distances 

 from ono another; on the posterior main claws tliev heconie fewer and lewer and sliorter and 

 shorter; in some species, however, they aic rather short e\('n nii the anteiidr chtws. Tlie main 

 chiws. at least the anterior ones, are luinished dorsaily witli short hairs. Claws nos. 2 anil 15 

 are verv finely serrated ilorso-distally ; 1 cannot say with certainty whether a similar serration 

 <iceurs in all the species descrihed in this treatise, as this part ol the claws is often rather con- 

 siderablv worn. The posterior claws are finely pectinated. Sometimes the j)ostcrior claws are 

 finely annulated and on account oi this they are exceedingly like bristles; this character cannot, 

 however, be used as a criterion in classifying the claws into main claws and secondary claws, 

 as it varies, at least in a number of species; in some forms there seems to he no ammlat ion at all. 

 The lamellae often have short, fine hairs behind the claws. 



M a 1 e: — Tn some species it has the same number of claws as in thi- female, in others 

 it has slightlv fewer. It is practically impossible to discover any division into main claws 

 and secondary claws. The first claw is, at least in a number of species, somewhat more slender 

 and somewhat more boldly curved than in the female. The equipment of teeth on the claws 

 is somewhat weaker, especially on the first claw; this claw is almost entirely unarmed; its 

 distal quarter is even ipiite smooth. 



The u p p e r 1 i p is small and has two lobes; cf. Ci. O. S \i;s, 1887. ])1. V. fif^s. 4 and 5. 

 It has a very small field of glands. 



The rod-shaped organ is rather long, of moderate breadth and rounded distally; 

 its shape is somewhat irregular, most often somewhat broader at the middle; unjointed. In most 

 of the species described below of about the same type as that reproduced in fig. 11 foi' A. Ohlini. 



The lateral eyes are most often well developed; see below, A. ahyssicola. 



Gills: — These are of quite the same type in all the species I have investigated. 

 Cf. G. 0. Sars, 1887, pi. VI, figs. 6 and 7. There are fourteen of them, seven in each row. 

 They are all of about the same type, rather long and broad lamellae, of uniform width and more . 

 or less well rounded distally. 



Special terminology: — Shell: — The list inside the posterior margin of the shell is 

 called ,,the spine-bearing list". 



For the terms for the distal bri,stles of the first a n t (> n n a see the special 

 terminology of the family. 



Mandible: — The scythe-shaped process: The spine which is directed 

 proximally on the distal part of the ventral margin and which is characterized by the fact that it 

 is continued on the lateral side of the process by a low, bow-shaped ridge, armed, like the spine, 

 with a close series of stiff, rather short hairs, is called ,,the main spine". The protuberances 

 and spines on the ventral edge proximaUy of the main spine are called ,, ventral spines". The 

 serrate teeth of the dorsal edge are called ,,the dorsal serrate teeth". The bristle distally of 

 these serrate teeth is called ,,tlie dorsal bristle". The backward pointing pro- 

 cess: The three or four bristles situated distally on this process, which are characterized 

 by the fact that their secondary spines become weaker and weaker distally are called ..the 



