4S ME- T. SCOTT OX ENTOMOSTRACA 



long. 6° 35' 2" E., 10 fathoms tow-netting, January 23rd (night collection). Station 23, 

 185 fathoms tow-netting, February 5th (clay collection). 



Kot more than one, or at most two, specimens of this Scolecitlirix were obtained in 

 each of the tow-nettings from the localities here recorded. The prominent keeled 

 forehead, which gives this species such a marked character, enables it to be readily 

 distingiiished. 



^S" 



ScOLECiTHRix CTENOPUS, Giesbrecht. (PI. V. figs. 2-9.) 



1892. Scolecithrix denopus, Giesbrecht, Fauna und Flora des Golfes von Neapel (Copepoden), p. 285, 

 pis. 13, 37. 



Male. Length, exclusive of tail-setse, 1'83 mm. The cephalothoras elongate, rounded 



in front and behind. Anterior antennae slender, reaching to the extremity of the 



abdomen, the left 21-, the right 20-jointed. The proportional lengths of the joints of the 



left antenna are nearly as follows : — 



16. 16. 3. 3.3. 4. 4. 16. 5. 5. 6. 6. 6. 5. 6. 5. 6. 6. 6.6. 3 

 1 -J. a 4 5 6 7 S y lu 11 12 13 14 15 16 17 18 19 20 21' 



The sixteenth joint of the right antenna consists of two coalescent joints, but otherwise 

 the right and left antennse are similar ; posterior antennce and mouth-organs as in Scoleci- 

 tlirix DaiKe. The inner branch of the third pair of swimming-feet small, the terminal spine 

 of the outer branch somewhat distorted, its outer margin being furnished with irregular 

 but stout and prominent teeth. The fifth pair of feet has one very short 3 -jointed, 

 and one very long, slender, 4-jointed branch, which extends beyond the extremity of 

 the abdomen ; the last segment of the elongate branch is curved, furnished on one side 

 with a dense fringe of hairs, and terminates in two unequal spines ; the small 3-jointed 

 branch is about as long as the first segment of the long branch, the basal joint being 

 longer than the other two together. Abdomen 4-jointed ; joints subequal, fully one- 

 fifth the length of the cephalothorax. Caudal stylets short, not divergent, bearing at 

 the extremity four moderately long plumose hairs, the inner being shorter, and the next 

 one considerably longer than the others ; the arrangement of the tail-setse in this species 



resembles Undina more than Scolecitlirix. 



Mahitat. Station 2, 50 fathoms tow-netting, January 1st (night collection). Station 9, 

 50 fathoms tow-netting, January 10th (day collection). Lat. 3° 58' N., long. 3° 42' W., 



25 fathoms tow-netting, January 13th (day collection). Lat. 3° 55' 3" N., long. 4° 7' 3" E.^ 



20 fathoms tow-netting, January 20th (day collection). Lat. 0° 21' 1" N., long. 7° 33' E., 



20 fathoms tow-netting, January 29th (day collection). 



Scolecitlirix ctenojms was comparatively a rare species in the ' Buccaneer ' collection, 



having been observed in only a few of the tow-nettings. The most marked characteristic 



uf this Scolecitlirix is the extremely long branch of the fifth foot, having the last 



segment curved, and with the margin densely setiferous. 



SCOLEClTHrvIX TENUIPES*, n. sp. (PI. V. figs. 10-19.) 



Male. Length, exclusive of tail-seta?, 1-4 mm. Anterior antennse reaching to beyond 



* From the Iod"- slender fifth loot. 



