REPORT ON THE AMPHIPODA. 1611 



"Rliabdosoma Whitei Sp. Bate, CataL Amph. Crust, pg. 345, PI. 54, fig. 7. 12 Febr. 75. Western 



Pacific ( t? ) ; lat. 4° 19' N., long. 130° 15' E., between the Tulus and Warren Hastings Isl. 



Jin der Melanesian sea, auf dem Wege von Api — Cap York, lat 14° 7' S., long. 153° 43' E. 



24 Aug. 74. 



Fig. 1. S lOxnat Gr. 



« Erste ) 



? rr -i r Antcnne. 



o Zweite J 



br. Braucbien. 



<j Ganglion. 



<jl Casca des Darms. 



stm Muskelmagen. 



i Darm. 



t Hoden. 



x unbekannter Muskelansatz. 



v Herzklajspen. 



Fig. la. Erste Antenne des g. 



Fig. 2. Kopf des 9 x 10 nat. Gr. 



md Mandibula, sonst Buclistaben wie oben. 



Fig. 2a. lte Antenne des $?. 



l °' ' . } Gnathopod des <J. 



le Z welter J 



Fig. \g. Unterlippe niit Item Gnathop. des g. 



Fig. Id Mandibula -v 



Fig. le lte Maxilla I des <?." 



Fig. 1/ 2te Maxilla) 



The specimens referred to have not come into my hands, but it is clear that in 

 fig. 1 the small fifth perseopod by a very natural mistake has been marked as one 

 of the branchial vesicles ; the ostia of the heart are placed in the second, fourth, and 

 sixth segments of the perseon, no lateral opening being shown in the third segment ; 

 the third and fourth perseopods are drawn with the fingers directed backwards just as 

 in the first and second pairs, instead of forwards, which is their ordinary position ; the 

 fourth pergeopod is represented as considerably larger than the third, but it may be 

 taken for granted that the two have been transposed, probably owing to an accidental 

 crossing of these delicate appendages in the specimen itself. 1 Fig. \g is said to 

 represent the Unterlippe, that is, the maxillipeds, with the first gnathopod, but the part 

 spoken of as the Unterlippe is more probably the lower part of the first segment of the 



1 Spence Bate in his description of Rliabdosoma whitei, loc. cit., says, " pereiopoda gradually increasing in length 

 posteriorly, the fourth pair being the longest." Streets also says in his account of " Rliabdosoma rohitei," Bate, in 

 reference to the peraeopods, " the remaining thoracic legs simple, first joint not dilated, as slender as the preceding, 

 increasing in length to the sixth," meaning by the sixth thoracic legs the fourth pera;opods. Nevertheless it seems to 

 me altogether improbable that the form should differ in this respect from all the rest of the Oxycephalidse, whether in 

 this genus or in other genera of the family. When for convenience of delineation the legs are stretched out in the 

 firpire apart from one another below the body, mistake seems impossible, but in the specimen itself the limbs are 

 apt to get very mixed in appearance, so that in the entanglement an observer, guided by an earlier description, might 

 readily adopt an error which in the first instance was easy enough to make. This consideration lessens the wei«ht 

 which would necessarily be attributed to the agreement on the point in question between Spence Bate, Streets, and 

 v. Willemoes Suhm. 



