135 



localities the specimens were taken in the free state among algse and other 

 marine growths. 



Distribution. British Isles (Scott), Kara Sea (Hansen), Ceylon (A. Scott). 



Fam. 9. Cancerillidae. 



Characters. Body of rather different shape in the different genera, but 

 scarcely clypeiform. The 2 or 3 posterior trunk- segments imperfectly developed, 

 without any epimeral plates. Tail short or moderately produced, with a some- 

 what varying number of segments. Anterior antennae normal. Posterior antennae, 

 however, very unlike those in the preceding families, being transformed into strong 

 prehensile organs terminating in a powerful curved claw. Siphon imperfectly 

 developed, in some cases obsolete. Mandibles short, mucroniform, extending 

 straight inwards, palp absent Maxillae likewise incurved and terminating in one 

 or 2 setiferous lobes. Maxillipeds on the whole built in the usual manner; 

 though attached at a somewhat greater distance from the median line than in the 

 other families. Some of the posterior pairs of legs imperfectly developed or quite 

 wanting, this imperfect development in some cases even extending to all the 

 legs (in female). 



Remarks. This family answers to the subfamily Cancerillince of Giesbrecht, 

 and contains as yet only 2 genera, to be treated of below. These genera, it is 

 true, differ considerably, both as to the outward appearance of the body and to 

 some of the structural details, but yet exhibit some well-marked features in 

 common, the most essential of which are the prehensile character of the posterior 

 antenna?, and the imperfect development of the siphon and of some of the legs. 



Gen. 34. ParartOtrOgUS, Scott, 1893. 



Generic Characters. General form of body not deviating much from the 

 usual type, the anterior division being moderately dilated and somewhat flattened. 

 Cephalic segment more or less expanded in the middle, with the frontal part 

 somewhat produced, but without any true rostrum; postero-lateral corners not 

 produced. The 2 succeeding segments well developed, with rounded epimeral 



