THE 



VOYAGE OF H.M.S. CHALLENaEK. 



ZOOLOGY. 



KEPORT on the Phyllocarida collected by H.M.S. Challenger during the 

 Years 1873-76. By Professor G. 0. Sars, of the University of Christiania. 



INTRODUCTION. 



Among the numerous Crustacea brought home by the Challenger Expedition, there are 

 two forms belonging to the above named interesting group, both of which represent new 

 generic types. This addition is especially of high interest since only a single recent 

 genus of Phyllocarida was hitherto known, viz., the genus Nebalia, all the other forms 

 belonging to this group being Palaeozoic fossils. Thus, a closer investigation of the two 

 new types added by the Challenger Expedition cannot fail to be of great importance in 

 advancing our knowledge of this very remarkable and anomalous group of Crustacea. 



One of the forms has abeady been roughly described by the late Dr. v. Willemoes 

 Suhm under the name of Nehalia longipes, and in the last edition of Professor Claus' 

 Zoology this form has been quoted with a new generic name as Paranehalia longipes. I 

 fully agree with Professor Claus that this species ought to be regarded as the type of a 

 new genus, which, however, is rather nearly related to the earlier known genus Nebalia. 

 The other form contained in the Challenger collection seems to deviate much more from 

 the typical genus, and may perhaps throw some light on the structure of certain fossil 

 forms. But the very restricted material has unfortunately prevented me from instituting 

 a satisfactory anatomical investigation of this interesting form. Besides these forms, 

 according to a letter fiopi the late Dr. v. Willemoes Suhm to Professor v. Siebold,^ a 



' Zeitschr. f. vnss. Zool., Bd. xxiv. 



(ZOOL. CHALL. EXP. — PART LVI. 1887.) Kkk 1 



