36 ME. T. SCOTT ON ENTOMOSTEACA 



last segment of the abdomen. Eacli stylet is fm-nished with one extremely long seta, 

 wliicli is longer than the cephalothorax and abdomen together ; each seta bears a dense 

 mass of fine hairs, near, but not quite at, its extremity ; the extreme end appears to be 

 free from hairs ; there are also three short and densely plumose setse on the exterior 

 margin of the stylets, one near the middle and two near the extremity of each stylet. 



EaUtat. (1) Lat. 3° 58' N., long. 3°42' W., 25 fathoms tow-netting January, 13th (day 

 collection). (2) Lat. 1° 55' 5" N., long. 5° 55' 5" E., 360 fathoms tow-netting, January 

 22nd (day collection, temperature of the water about 43° E.). (3) Off Sao Thome Island 

 (lat. 0° 34' N., long. 6" 30' 4" E.), 24 fathoms tow-netting, January 23rd (day collection). 



Only two or three specimens of this interesting form were obtained. The extremely 

 long tail-setse, \Aath the remarkable accumulation of fine hairs near their extremity, 

 distinguish this Augaptilis at once from the other species described in this Report. 



AuGAPTiLis Rattrayi, n. sp. (PI. II. figs. 25-37.) 



Length, exclusive of tail-setse, 4'9 mm. Cephalothorax robust, seen from above 

 broadly ovate, measuring in breadth 2'6 mm., rounded in front, the postero-lateral 

 ano-les of the last thoracic segment also rounded. Thoracic segments five, the first as 

 lono" as all the other four together. Every part of the integument — cephalothorax, 

 abdomen, and appendages — is covered more or less with minute spinous hairs. Anterior 

 antennre short, not much longer than the first thoracic segment, 24-jointed. The pro- 

 portional lengths of the joints are nearly as follows : — 



60 . 25 . 20 . 20 . 20 . 20 . 22 . 35 . 35 . 32 . 43 . 50 . 53 . 49 . 52 . 54 . 60 . 5 6 . 47 . 49 . 4 . 42 . 45 . 36 

 i 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 2r"22 23 24" 



The antennae are sparingly setiferous, the setge on the second, eighteenth, and twentieth 

 joints being the longest. The posterior antennse have the basal part stout, the primary 

 and secondary branches short, the secondary branch being shorter and more slender than 

 the other and 7-jointed ; the last joint is rather longer than all the preceding four 

 too'ether, and furnished at the extremity with three long setae, which are plumose from 

 the middle. The end of the primary branch is also furnished with a number of hairs 

 similar to those of the secondary branch. The mandibles are slender and terminate in two 

 moderately long teeth, between which is another minvite and rudimentary one ; the 

 mandible-palp is stout, 2-branched, one of the branches 2-, the other 4-jointed ; 

 both branches bear several plumose hairs. The "rod-like process" of the maxillas 

 terminates in three very long plumose hairs. Two hairs, bearing each a double row of 

 peculiar short filaments having flat broadly crescent-shaped tops, which extend from 

 near the distal end to about the middle of the hairs, spring from the extremity of a 

 stout lateral appendage of the maxillse. Anterior foot-jaws stout, 5-jointed, the first 

 two with several stout spinous hairs on the anterior margin, the last three with a number 

 of long setae having a double row of short filaments, with flat, broadly crescent- 

 shaped tops, each double row not extending below the middle of the seta. The posterior 

 foot-jaw 6-jointed, the first two joints moderately stout and long, sparingly setiferous 

 on the upper margin ; the second joint has also a long non-plumose hair attached to 



