A FEW TYPE OF AMPHIPODA. 129 



the hand itself is the sixth joint. All the diflFerences enumerated 

 between Ingolfiella on the one side and the tribe Caprellina or 

 especially the family Caprellidse on the other side, prove that the 

 new type is very distant from the " Lsemodipoda " and cannot 

 be regarded as an intermediate form between some family of the 

 Grammarina and the family Caprellidse. 



"When Ingolfiella is compared with the families of the tribe 

 Gammarina, fresh diificulties are met with. The genus differs 

 from all Grammarina hitherto known not only by the four 

 characters printed above in italics, but besides by the filiform 

 body without " epimeral " thoracic plates and by some other 

 less important characters. It is easy enough to see that it has 

 nothing to do with such families as the Lysianassidse, the 

 Ampeliscidge, the Stegocephalidse, the G-ammaridse, &c., but it is 

 impossible for me to point out any family to which it is really 

 related. "When we compare it with the Corophiidse and the 

 Dulichiidse (sens. Sars), the two families in which the epimeral 

 plates are at most of very moderate size and sometimes small, 

 and the last pair of uropods reduced or wanting, several differ- 

 ences are easily observed. The mandibles of Inrjolfiella, differ 

 not only in the above-mentioned styliform molar process — in 

 the two last-named families this process is short, thick, broadly 

 truncate, and adapted for mastication — but aho in its general 

 shape and by not possessing the palp. In the maxillulse of 

 Ingolfiella the palp has the first joint proportionately elongate, 

 the second joint short, while the first joint is short, the second 

 very long in the Corophiidse and Dulichiidse as in all other 

 Gammarina possessing a palp of normal length. I am acquainted 

 with only one instance which may be said to be intermediate 

 between Ingolfiella and other Gammarids, viz., the palp of 

 Eusirojpsis Riisei, Stebbing, which, according to that author 

 (Trans. Linn. Soc. ser. 2, Zool. vol. vii. part 2, p. 40), " has a 

 stout first joint, but the second is weak and tapering, scarcely 

 longer than the first . . ." In the maxillipeds the third joint is 

 without any lobe, but in the two families named this lobe is very 

 large, much larger than the lobe from the second joint. The 

 disappearance of the lobe from the third joint is very rare in the 

 tribe Gammarina : Sars says (Crust, of Norway, vol. i. p. 234) 

 that these lobes are " obsolete " in the family Stenothoidse ; iu 

 his figures of those appendages of Stenotlioe and Proboliuni a 

 rudiment of the lobes can be seen, but in Metoj^a Alderi (Bate) 



