FEOM THE GULF OF GUINEA. 49 



the extremity of the abdomen, the left 21-, the right 20-jointed. The following are the 



proportional lengths of the joints, nearly, of the left antenna : — 



5.4.3.3.3.3.3.13.4. 4 .5. 5. 5. 6. 5. 5.5. G.5. 5. 3 

 12 3 4 5 7 ^S 9 10 11 12 13 14 15 16 17 18 19 20 2l' 



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

 both right and left antennae are similar. The posterior antennae, mouth-organs, and first 

 pair of swimmiug-feet are somewhat similar to those of Scoleclthrix DancB. The outer 

 branch of the third pair has a distorted terminal spine, as in Scolecithrix ctenojms. The 

 segments of all the first four pairs of swimming-feet are armed with curved, transverse 

 rows of short, stout spinules. The fifth pair of feet consists of one very long, slender 

 branch, and an extremely short, almost obsolete, 3-jointed one. The elongate branch 

 has the basal joint somewhat stout and sliort, the second long, fully twice the length of 

 the third; the fourth long and slender, longer than the second; the last joint is 

 extremely small, with a spiniform extremity. Abdomen, caudal stylets, and tail-setae as 

 in Scolecithrix ctenopus, which appears to be closely allied to the species now described. 

 The fifth pair of feet are, however, decidedly different from those of Scolecithrix ctenopus, 

 being much more slender and without the fringe of hairs. The terminal worm-like 

 sense-organs of the anterior foot-jaws are stouter than those of Scolecithrix ctenopus, 

 though that species is the larger of the two. 



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

 50 fathoms tow-netting, January 10th (day collectionj. Lat. V 55' 5" N., long. 5° 55' 5". E., 

 30 and 3G0 fathoms tow-nettings, January 22nd (day collection). 



Scolecithrix temiipes was not obtained from any surface gatliering, and was of rare 

 occurrence in the few tow-nettings in which it was observed. 



Scolecithrix Dan.e (Lubbock). 



1856. Undina Dana, Lubbock, Trans. Entom. Soc. vol. iv. p. 15, pi. ix. figs. 6-9. 

 1883. Scolecithrix Dance, Brady, Report ' Chall.' Copep. p. 57, pi. xvii. figs. 1-12. 



Habitat. Station 2, surface tow-netting, January 1st (night collection). Station 9, 

 25 fathoms tow-netting, January 10th (day collection). Station 11, 10 fathoms tow-netting, 

 January 19th (day collection). Stations 21 and 22, surface tow-nettings, February 4th 

 (day collection). Lat. 5° 55' 1" S., long. 11° 30' 7" E., surface tow-netting, February 18th 

 (night collection). 



Scolecithrix Dance w^as observed in 57 tow-nettings, 20 of which were surface gatherings, 

 and tiie others undei'-surface ; 10 of the surface and 24 of the under-surface were day 

 collections, wdiile 10 of the surface and 13 of the under-surface gatherings were collected 

 during the night, as shown by the formula ; — 



r 10 day collections. 



f 20 surface 1 m ,,;'i + ^•^-^. 



rr, ,,. >- I <- 10 night ditto. 



Tow-nettings o / < ° 



1 37 under-surface | ^"^ '^^^ '^^^tto. 



1 13 night ditto. 



SECOND SERIES. — ZOOLOGY, VOL. VI. 7 



