DE BAIRD ON ENTOMOSTKACA. 156 



armatns 1 Tilesius. Hah, Pools of sea water in rocks on shore 

 at Cockbumspath and Berwick. 



Sp. 2d. — A. nohilis. Nov. spec. 



Thoracic and abdominal portions of body distinct from each 

 other. The thorax is composed of four segments, and is large 

 and rounded. Abdomen consists of six slender segments, the last 

 bilobed, and giving off two long and two short setae. The whole 

 insect is beautifully coloured with green, red, and purple. Eye 

 large, of a ruby colour. Antennae short, of seven segments, all 

 setiferous ; the two first short and stout, the third much longer, 

 toothed on upper edge, and giving off at its extremity several 

 long setaj ; four last small and short. Antennules composed 

 of two segments, the first giving off a shoot from about the mid- 

 dle of its length, the second terminating in several stout setce. 

 The mandibles and anterior, or first pair of foot-jaws, are strong, 

 and resemble the same organs in cyclops quadricomis. Posterior 

 foot-jaws shorter and stouter than those of preceding species, 

 and consisting of two joints and a terminal hooked claw. Tho- 

 racic pair of feet differ from abdominal ones. They consist of 

 two stalks rising from a common base : the anterior or upper stalk 

 consisting of one long joint, and a very short one which ter- 

 minates in a strong claw ; the posterior or inferior stalk is very 

 short, toothed on the edge, and giving off several stout setae. The 

 abdominal feet resemble those of preceding species, the set® with 

 which they and the fulcra are provided being all plumose. The 

 fulcra resemble those of chelifer. The setae of tail, however, are 

 not plumose. This species is, at least, three times larger than 

 preceding, and has the body more rounded and much stouter. 

 Hah. Berwick Bay, September 1844. 



Oenu9 5th, — Altbutha.* 



Foot-jaws small, simple ; body flat. Two strong falciform ap- 

 pendages from fifth segment of body. 



Sp. 1st. — ^Alteutha depressa — Cyclops depressus, Baird, 

 Mag. Zool. and Bot. Hah, Berwick Bay. 



FAMILY 2.— PONTIAD^. 

 Head distinct from body, with a beak in front. Thoracic por- 



* like Town of (A« TwMd. 



