THE AMPHIPODA. 45 



EXPLANATION OE THE PLATES. 



Plate 2 a. 



Eusirogenes dolichocarpus. n. g. et. sp. 



n.s. Natural size indicated by a line showing the length of the specimen enlarged below. 



a.s., a.i. Upper antenna and part of lower antenna. 



L.t. Upper lip. 



m.m. Mandibles. 



mx. 1, mx. 2, mxp. First and second maxillae and maxillipeds. 



gn. 1, gn. 2, prp. 1, 2, 5. First and second gnathopods and parts of first, second, and fifth perjsopods. 



urp. 1, urp. 2. First and second uropods. 



In the detail figures the antennae and appendages of the perteon and pleon are drawn to one scale, 

 portions of a.s. and gn. 1 being added on the same scale as the mouth-organs. Parts of the mandibles 

 are still more highly magnified. 



Plate 2 b. 



Parascina Fowleri, n. g. et sp. 



n.s. Line showing length of specimen enlarged above, 



a.s., a.i. Upper and lower antennae. 



m.m., mx. 1, mx. 2, mxp. Mandibles, first and second maxillae, and maxillipeds. 



gn. 1, gn. 2, prp. 2, 3, 4, 5. First and second gnathopods, second, third, fourth, and fifth peraeopods. 



urp. 1, urp. 2, urp. 3, T. First, second, and third uropods and telson. 



Details of peraeon and pleon magnified to a uniform scale ; parts of the two gnathopods more highly 

 magnified ; parts of other appendages still more highly, in agreement with figures of the mouth-organs. 



Plate 3 a. 



Archeeoscina Bonnieri, n. g. et. sp. 



n.s. Line indicating natural size of specimen figured below. 

 a.s., a.i. Upper and lower antennte. 

 m.m. Mandibles. 



gn. 1, gn. 2, prp. 1-5. First and second gnathopods, first to fifth peraeopods. 



pip., urp. 1, 2, 3. A pleopod and first, second, and third uropods, the telson appearing between the 

 bases of the third uropods. 



All details drawn to the same sale. 



Plate 3 b. 



Scina lepisma (Chun). 



ns. Line showing length of specimen figured to the left. 



U.S., a.i. Upper and lower antennae. 



I.S., m.m.y mx. 1, mxp. Upper lip, mandibles, first maxilla, and maxillipeds. 



gn. 1, gn. 2, prp. 1-5. First and second gnathopods, first to fifth peraeopods. 



urp. 1, 2, 3, T. First, second, and third uropods and telson. 



Details drawn lo the same scale. 



8» 



