NO. 1573. PARASITIC COPEFODS— WILSON. 365 



Eclithrogaleus denticulatus , described by S. I. Smith in 1874, but 

 of which no figures have hitherto been pubhshed. 



" Dinematura'' neozealanica, described and figured by Thomson in 

 1S89, and rightly referred to the present genus ]\v Bassett-Smith in 

 1899. 



Echthrogaleus torpedinis, new species (p. 371). 



Dana's Dinemahira hraccata is possibly a young female of Ech- 

 throgaleus coleoptratus rather than of E. affinis, as Bassett-Smith 

 would have us believe ; eight valid species appear in the above key. 



In 1833 Milne Edwards described a new species of parasitic cope- 

 pod, to which he gave the name Pandarus alatus. Two years later 

 Johnston published a description of what he claimed to be the same 

 species, giving it Milne Edwards's name. On founding the present 

 genus Steenstrup and Liitken decided that Johnston's species was the 

 same as Guerin's " Dinematura coleoptrata," and that it was not 

 identical with Milne Edwards's species. This latter decision is con- 

 fu-med by the following differences: Milne Edwaids's species shows: 

 1. No division of the lateral areas of the carapace. 2. No trans- 

 parent spots on the dorsal plates of the fourth thorax segment. 

 3. Second maxillipeds armed with slender terminal claws and without 

 accessory claws or spines. 4. Marked differences in the shape of the 

 second antennge, first maxillipeds, and maxillae. 5. Both rami of 

 the second and third pairs of legs tliree-jointed. 6. Rudimentary 

 legs just in front of the abdomen. 



Johnston's species, on the contrary, shows: 1. Distinct divisions of 

 the lateral areas. 2. Transparent spots on the fourth segment plates. 

 3. Tliick and stout terminal claws on the second maxillipeds, fur- 

 nished with large accessory claws. 4. The rami of all the legs two- 

 jointed. 5. No rudimentary legs in front of the abdomen. Such 

 differences are rather too numerous and important to allow any 

 assumption of the identity of the two species. Johnston's descrip- 

 tion does agree with that of Guerin and Steenstrup and Liitken in 

 every particular, and his species may therefore be taken as a synonym 

 of Guerin's E. coleoptratus. 



As to the location of Milne Edwards's original "Pandarus alatus," 

 it is difficult to decide. In the stRicture of the mouth-tube, maxillae, 

 and second maxillipeds, in the three-jointed endopods of the second 

 and third legs and in the presence of rudimentary legs just in front 

 of the abdomen it conforms to the genus Dinematura rather than 

 Echthrogaleus. But in the fusion of the second and third thorax 

 segments, in the broad shape of the genital- segment, in the absence 

 of any dorsal plates for the sixth segment, and in the small size of 

 the fourth legs it conforms to Echthrogaleus and is unlike Dinematura. 



Hence it can not be located with certainty according to available 

 data; Milne Edwards's statements seem to favor its inclusion under 



