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appearance it differs considerably from the ordinary Calanoid type, resembling 

 rather, in this respect, the Cyclopoida, which may have been Th. Scott's reason 

 for placing it in the family Misophriidce. 



Occurrence. Only 2 or 3 specimens of this remarkable form have hitherto 

 come under my notice. They were taken many years ago at Christiansund, west 

 coast of Norway, the exact depth not being recorded. On a closer examination, 

 one of the specimens turned out to be an adult male, though at first I did not 

 recognise it as such, on account of the inconspicuous sexual characters. 



Distribution. Scottish coast (Th. Scott). 



Farm. 19. Pseudocyclopidae, 



Characters. Body quite cyclopoid in appearance, though, as in other 

 Calanoids, having the last segment of metasome firmly connected with the preceding 

 one. Cephalosome well defined from the 1st pedigerous segment, front acutely 

 produced below, and without any tentacular appendages. Urosome consisting in 

 female of 4, in male of 5 segments. Anterior antennae very short, with the 

 number of articulations reduced; right antenna in male distinctly geniculate. 

 Posterior antennae with both rami well developed. Oral parts on the whole built 

 upon the calanoid type. Legs robust, cyclopoid in shape, with both rami 3-arti- 

 culate ; last pair in female resembling in structure the preceding pairs, in male 

 much transformed, prehensile. 



Remarks. This family has been established by Dr. Giesbrecht, to include 

 the genus Pseudocyclops of Brady, which was erroneously placed by the latter 

 author in the family Misophriidw. Among the more prominent characters dis- 

 tinguishing this family, may be named the structure of the last pair of legs, 

 these being biramous and natatory in the female, whereas in the male they are 

 transformed to very large and compact prehensile organs, somewhat recalling the 

 copulative appendages in the Ostracoda. We only know at present of a single 

 genus belonging to this family. 



18 Crustacea. 



