'212 BRITISH ENTOMORTRACA. 



into cio;ht verv short articulations, having between the 



o o 



fourth and fifth a very small lateral joint, as in most of the 

 other species. Each articulation sends off one or more 

 seta?. The antennules are similar to these organs in the 

 other species, as arc also the posterior foot-jaws, which 

 consist of two rounded joints, terminated by a slightly- 

 curved book. 



The first pah 1 of feet docs not differ in structure from the 

 others, and consists of two stalks, of nearly equal length, 

 each composed of three articulations, and each articulation 

 giving off two or three setae. The outer branch is more 

 slender than the inner. The fulcra or supports consist of 

 a broad, flat plate, with several tolerably long seta?, as in 

 the preceding species. 



Hah. Berwick Bay, 1835. Dover, North Foreland, 

 September 1849. 



Genus 3 ARPACTICUS.* 



CYCLOPS, Mi'dlci; Tilesuis, Jiaird, fyc. 

 MONOCULUS, Manuel, Gmrli/i, $r. 

 ARPACTICUS, M. AV///Y//V/.V, .Ihiinl, Dana (iu part). 

 NATJFLIUS (pars), Philippi. 



Character. Foot-jaws forming strong cheliform. hands. 

 Antennules simple. Ovary single. 



]. ARPACTICUS CHELIFER. Tab. XXIX, figs. 2, 3, %a-g. 



CYCLOPS CHELIFER, Mirlli-r, 7,ool. Dan. Prod., No. 2-il3, 1776; 



KM Inmost., 114, t. 19, f. 1-3. 

 latreille, Hist. Nat. Crust., iv, 209. 

 Hose, }lan Hist. .\at. Crust., ii, 259. 

 Jiairrt. Mag. Zool. and I'-oi, i, 328, t. !>, f. 15-22. 



MOHOCI I.I S CHELIFER, Mitilllfl, Kllf. llirtll., \ ii, 721, t. 201, f. 32-3-1. 



Omelin, Linn. S\>1. Nat, nlit. 13th, i, 2998, 

 No. 21. 



CYCLOPS Jon s SIMM. /.V//W, Trans. r,rr\v. Nat . Club, i. 97, t. 2, f. 4, 1 VS.', . 

 CYCLOPS ARM ATI s, '/V/V.svV'.v, .Mi'iii. Acail. Iniji. Si. IVtrrsl)., v, 3(iG, 



I. s, f. 7, 8. 



ARPACTICI s < nu.n i n. ///'//v/. Trans. Bcnv. Nai. Clul', ii, 15 I. L845. 

 NA.TTMI s t m.i.m i;, /'////////</, \Vii'i:iii. ami KnVlis. Arcln\ , 18-13, p. 69. 



* 1 -'., 



