128 ME. T. SCOTT ON ENTOMOSTEACA 



equal to half the entire length of the animal, exclusive of caudal stylets ; forehead 

 hroadlv rounded. Anterior antennae slender, shorter than the first hody-segment, 

 20-jointed; the second to the ninth joints and also the eighteenth and twentieth, 

 which are all of nearly equal length, are shorter than the others, as shown in the 

 annexed formula : — 



10. 4. 3. 3. 3. 2. 2. 3. 4. 4. 7. 7. 7. 6. 7. 8. 10. 4. 6. 3 



1 2345678 9 101112 13 1415 16 17 18 19 20 



An olfactory filament springs from the end of the seventeenth joint. Posterior 

 antennae and mouth-organs nearly as in Artoti^ogus Boeckii, except that the mandihular 

 stylets are considerably longer and their terminal setoe shorter ; the terminal claw of the 

 posterior foot-jaws is also longer in the ' Buccaneer ' specimens. The five pairs of 

 swimming-feet also resemble those of Artotrogus Boeckii. In the fourth pair (fig. 26) 

 a long, stout, plumose seta springs from the extero-distal angle of the first basal joint, 

 and the outer distal angle of the second joint of the inner branch is bidentate. The 

 abdomen consists of three segments, and the caudal stylets, which are about three times 

 as long as broad, are equal in length to the last abdominal segment. 



Habitat. Accra, in a shore gathering, collected January IGth. One or two specimens 

 only were obtained. 



Artotrogus, Boeck (1859). 



Artotrogus (pars) and Asterocheres, Boeck, Tvendc nye parasitiske Krebsdyr, 1859. 

 Ascomyzon, Thorell, Om Knistaceer i Ascidier, 1859. 



? Artotrogus abyssicolus, n. sp. (PL XII. figs. 5-9 ; PL XIV. figs. 11-18.) 

 Female. Length 1"1 mm. Cephalothorax robust ; the first segment, which is con- 

 siderably dilated and equal to about four-ninths the length of the entire animal, is 

 anteriorly three-lobed ; the two side-lobes are i-ounded, but the middle one is broadly 

 triangular ; the last thoracic segment is very small and scarcely so broad as the first 

 segment of the abdomen. The abdomen is elongate and slender, and nearly of equal 

 breadth throughout ; first segment about equal to the length of the next two together, 

 the remaining segments become gradually shorter. Caudal stylets about half the 

 length of the last abdominal segment, and furnished with five moderately long setae. 

 Anterior antennce short, S-jointed, the last joint longer than any of the others ; a 

 long sensory filament springs from the end of the sixth joint ; the relative lengths of the 

 joints are shown in the formula : — 



27 . 12 . 6 . 12 . 8 . IS . 10 . 3 4 

 T 2 3 4 "5 6 7 8" 



Posterior antenna? 4-jointed, the second and third joints subequal and longer than the 

 first or fourth ; the last joint bears three spines — two terminal, one of which is moderately 

 long and one short, and a marginal spine ; a small 1-jointed secondary branch springs 

 from near the end of the second joint. The mandible consists of an elongate basal 



