188 



as also with a row of coarse spines inside the 2nd joint. Oral parts on the 

 whole of normal structure. Natatory legs comparatively slender, with both 

 rami 3-articulate ; inner ramus of 4th pair with the number of setae reduced. 

 Last pair of legs very small, bisetose. 



Remarks. This genus was established by my late father as early as 

 the year 1862, to include a peculiar Copepod found by him parasitic on the 

 gills of a species of Sabella. It ought undoubtedly to be included in the 

 family Lichomolgidce, as here defined, in spite of the aberrant form of the 

 body and the likewise somewhat aberrant structure of the 2 pairs of antennae. 

 The genus comprises as yet only a single species, to be described below. 



102. Sabelliphilus elongaius, M. Sars. 

 (PI. CVII). 



Sabellipliilus elongatns, M. Sars, Beskrivelse af 4 nye parasitiske Copepoder. Forh. Christiania 



Vid. Selskab f. 1861, p. 139. 



Syn: Sabelliphilus Sarsii, Claparede. 

 Lenckartii, Kossman. 



Lichomolgus subfiles. Thompson. 



Specific Characters. Female. Body very slender and elongated, with 

 the anterior division narrow oblong in outline, greatest width only slightly 

 exceeding Va of the length. Cephalic segment nearly twice as long as the 3 

 succeeding segments combined and obtusely truncated in front, exhibiting 

 behind a rather faintly marked transverse suture defining the cephalon from 

 the 1st pedigerous segment; rostral plate of moderate size and closely ap- 

 pressed to the ventral face, projecting at the end into 2 strong spiniform pro- 

 cesses. Lateral lobes of the 3 succeeding segments obtusely rounded. Last 

 trunkal segment very small. Tail scarcely attaining half the length of the 

 anterior division; genital segment of moderate size and considerably tumefied 

 in its anterior part; anal segment longer than the preceding one. Caudal 

 rami rather narrow, exceeding somewhat the anal segment in length, and scar- 

 cely divergent; seta of outer edge attached near the middle; apical setae slender, 

 the inner median one attaining the length of the tail. Anterior antennae about 

 half the length of the cephalon and clothed with comparatively short setae; 

 the first 2 joints much larger than the others and pronouncedly lamellar; 3rd 

 joint very small; the remaining 4 joints gradually diminishing in size. Posterior 

 antennae unusually strongly built, 4-articulate, the first 2 joints very massive 

 and forming with each other a geniculate bend; 2nd joint exhibiting inside a 

 longitudinal crest divided into 5 very strong teeth; 3rd joint armed at the end 



