Oscar Sund. [Nr. 6 



B. "Rostrum" a horizontal crest, 

 sinuous anteriorly, not reaching 



bey ond the front margin P. principalis n. sp. 



(Short spine on scaphocerite, 

 base of 2nd pereiopod with only 

 2 to 5 spines. Size up to 16 cm.). 



C. "Rostrum" spearshaped, deflected, 

 projecting much beyond the frontal 



margin P tarda Krøyer. 



(Spine on scaphocerite short, 

 base of 2nd pereiopod with 1 to 

 4 spines. Size up to 15 cm.). 

 II. Telson not forked . . P. sivado Risso. 



Pasiphæa jnultidentRta Esmark 1865. 



P. norvegica M. Sårs 1868. 

 P. tarda G. 0. Sårs 1877. 

 P norvegica Faxon, 1895. 

 By all subsequent writers the species has been called P. tarda. 



In accordance with the rules of nomenclature the above name 

 must be used, though it is very unjust to M. Sårs, who first pub- 

 lished an accurate description with admirable figures (1868), but 

 in 1865 Esmark published a short note with a latin "definition of 

 specific characters", rather indefinite I may be permitted to say, 

 and without figures. Still an examination of his single mutilated 

 type specimen shows me that the species he intended to describe 

 is really the same as Sårs' P. norvegica. Esmark's diagnosis runs 

 as follows: 



u Pasiphæa multidentata n. sp. cephalo-thorace compresso, supra 

 carinato, carina antice parum adscendente in fine truncata vel sube- 

 marginata; articulo tertio pedum primiparis dentibus acutis undecim, 

 secundeparis vigintiquatuor armato; postabdominis articulo ultimo 

 sive lobo medio caudæ supra per totam longitudinem profunde canali- 

 culato, apiceque bifurcato. Long. 80 mm." 



The specimen preserved in the University Museum of Christiania 

 is not however, 80 but about 110 mm. in length. I believe the 

 figure to be a misprint, as the specimen is from Namsos and bears 

 on the table the name of the collector (Mosling) from whom Esmark 

 obtained his specimen. Moreover the "state of mutilation" of Esmark's 



