70 



Gen. 19. PseudOCydOpia, Scott, 1892. 



Generic Characters. Body short and compact, with the anterior division 

 strongly vaulted above and more or less compressed. Eostral prominence deflexed, 

 without any tentacular appendages. Lateral parts of last segment of metasome 

 rounded off. Urosome with the last segment well developed in both sexes; 

 caudal rarni short, each with 4 apical seta?. Anterior antennae very unlike those 

 in other Calanoids, being unusually short and tapering rapidly distally, with 16 

 to 20 articulations, the 1st very large. Posterior antennoe with the outer ramus 

 6-articulate and much shorter than the inner. Mandibles very strong, masticatory 

 part thickened and having the cutting edge irregularly curved and minutely denti- 

 culate, palp with both rami well developed. Maxillae normal. Anterior maxillipeds 

 with the terminal appendages simple, setiform. Posterior maxillipeds slender, 

 with the 1st basal joint remarkably produced at the end anteriorly; terminal part 

 reflexed. Natatory legs with the spines of the outer ramus remarkably strong, 

 the terminal one in 2nd to 4th pairs coarsely serrate outside; seta of the 1st 

 basal joint in 3rd pair transformed to a strong elongated spine. Last pair of 

 legs in female 3-articulate, terminal joint the largest and spiniferous ; those in 

 male of moderate size, both legs uniramous, the right terminating in a styliform 

 claw, the left with the basal part considerably tumefied, outer part slender, 

 triarticulate. 



Remarks. This genus, established by Th. Scott, was erroneously referred 

 by that author to the family MisophriidcB, which, as shown by Dr. Giesbrecht, does 

 not even belong to the Calanoida, but more properly to the Cyclopoida. The 

 generic name Pseudocyclopia, proposed by Th. Scott, bears an inconvenient 

 resemblance to Psetidocyelops, a genus which does not belong to this, but to the 

 next section (Heterarthrandria), though it certainly exhibits some resemblance in 

 its external appearance, to the genus in question. Th. Scott records no less 

 than 3 different species of this genus, viz., P. crassicornis, minor and caudata, 

 all of them found in the Firth of Forth. None of these species have hitherto 

 come under my notice. On the other hand, a form observed by me many years 

 ago off the west coast of Norway, has proved to be identical with a 4th species 

 recently described by Mr. Thompson from Liverpool Bay. This species will be 

 described below. 



