Additional species. 



Fam. Ectinosomidae. 



Ectinosoma tenuireme, Scott. 



(Suppl. PI. 52). 



Ectinosoma tenuiretne, Th, & A. Scott, Revision of the British Copepoda belonging to the genera 



Bradya and Ectinosoma. Trans. Linn. Soc. London, 2nd ser. Vol. IV, Part 5, p. 439, PI. 36, 



fig. 33; PI. 37, figs. 8, 27, 36, 46; PL 38, figs. 1, 24, 40, 49. 



Specific Characters. Female. Body exceedingly slender, of narrow linear 

 form. Rostral plate not very prominent, and narrowly rounded at the tip. Uro- 

 some considerably shorter than the anterior division and somewhat tapered distally, 

 last segment very small. Caudal rami scarcely longer than they are broad, and 

 slightly divergent, apical setae exceedingly slender and elongated, the inner 

 medial one exceeding in length 2 / 3 of the body. Anterior antennse unusually 

 slender and attenuated, 7-articulate, 1st joint much the largest, last joint very 

 small. Posterior antennse with the outer ramus very narrow, 3-articulate, last 

 joint nearly twice as long as the other 2 combined. Anterior lip with the usual 

 recurved projection in front. Mandibles and maxillae of the usual structure. 

 Anterior maxillipeds very strongly built, with the 2nd basal joint considerably 

 dilated and fully twice as long as the 1st, terminal claws very slender. Posterior 

 maxillipeds long and narrow, with the terminal joint fully half as long as the 

 middle one. Natatory legs with the outer ramus much smaller than the inner, 

 scarcely exceeding in length the first 2 joints of that ramus combined. Last pair 

 of legs comparatively small, distal joint twice as long as it is broad, with the 

 middle seta exceedingly long and slender, almost 3 times as long as the other 2, 

 which are subequal in length; inner expansion of proximal joint extending con- 

 siderably beyond the middle of the distal joint, the 2 apical setae rather unequal. 

 Ovisac comparatively large, oblong in form. 



Colour not yet ascertained. 



Length of adult female 0.73 mm. 



