145 



with both rami in female 3-articulate. Inner ramus of 2nd pair of legs in male 

 transformed. Last pair of legs foliaceous, much larger in female than in male. 

 Ovisac double. 



Remarks. The chief character distinguishing this family is the duality 

 of the ovisac, a feature otherwise very rarely met with in the Harpacticoida. In 

 other respects this family exhibits a certain resemblance both to the Thalestridce 

 and to the Canthocamptidce. To the Norwegian fauna belong 3 well defined 

 genera, to be treated of txelow. 



Gen. 38. DiOSRCCUS, Boeck, 1872. 



Syn: Dactylopus, Glaus (part). 



Generic Characters. Body pronouncedly compressed in front, attenuated 

 behind, with the cephalic segment very large and deep, and the rostrum very 

 prominent. Anterior antennae comparatively slender, 8-articulate. Posterior an- 

 tennse with the outer ramus very small, uniarticulate. Mandibles with the masti- 

 catory part considerably dilated, cutting edge undivided, palp apparently simple, 

 with only a slight rudiment of an outer ramus. Maxillae distinguished by the 

 shortness of the masticatory lobe and the spines with which it is armed, palp 

 well developed. Anterior maxillipeds comparatively small, with only 3 lateral 

 lobes carrying short and thick digitiform spines. Posterior maxillipeds powerfully 

 developed, and of normal structure. 1st pair of legs with the outer ramus small, 

 not prehensile, inner much elongated and resembling in structure that in Thalestris, 

 though having the seta of the 1st joint attached close to the end. 2nd pair of 

 legs with the terminal joint of the outer ramus comparatively smaller than in 

 the succeeding pairs, and provided with only 2 spines outside; inner ramus of 

 same pair in the male very short, biarticulate. terminating in a strong spine. 

 Last pair of legs not very large, with short, partly spiniform setaa; in male still 

 smaller, and having the 2 joints confluent. 



Remarks. This genus was established by Boeck in the year 1872, to 

 include 2 of the species referred by Glaus to his genus Dactylopus, viz., D. tenu- 

 icor)iis and D. lonyirostris. These 2 forms, though alike in having 2 ovisacs, 

 are however evidently generically different, and the Boeckian genus must of course 

 be confined to one of them. This has indeed been done by Prof. Brady, who 

 describes the first-named species as the type of the genus Dioxaccus. The other 



