DR BAIRD ON ENTOMOSTRACA. 157 



FAMILY 1.— CALIGIDJE. 



Head in form of a large buckler, having anteriorly large frontal 

 plates. Four pairs of feet, which are furnished with long plumose 

 hairs. Antennae small, flat, and two-jointed. 



Genus Ist. — Caligus — MulUr, 



Fourth pair of feet slender, of one branch, and serving the in- 

 sect for walking. Not possessed of any appendage in the centre 

 of the anterior part of the buckler. 



Sp. Ist. — C. — ^Nov. spec ? Hab. The salmon, at Berwick. 



FAMILY 2.— ARGULID^. 



Head in form of a large circular-shaped shield. Antennae short, 

 thick, two-jointed ; second pair of foot-jaws absent, being replaced 

 by a pair of large suckers. 



Geniu Ist, — Argulus — Muller. Contains only one Genus. 

 Sp. 1st. — ^Argulus foliaceus — Monoculus foliaceus. Linn, 

 Syst. Nat. Argulus foliaceus, Jurinefils. Ann. des Mus. d'Hist. 

 Nat. vii. 431. Argulus delphinus, Muller. 



FAMILY 3.— DICHELESTID^.— (Dichelestiens, M. Edwards). 



Head small, tliick, obtuse in front, giving insertion to two slen- 

 der antennaj at its anterior edge. Body elongated. 



Oenxts 1st, — Anthosoma — Leach. 



Three pairs of feet, all foliaceous. Thorax provided above 

 with large lamellar appendages. 



Sp. 1st. — A. Smithii, Leach. Encyc. Brit. Suppl. i., t. 20, f 1-6. 



The order Lerncidfle, introduced here by M. Edwards, contain- 

 ing so many curious and outr6 forms, and the animals of which, 

 till within a few years, were considered to belong to the Vermes, has 

 been very little, if at all, studied in this country. As I have not 

 had an opportunity of examining those curious little creatures 

 alive, nor met with any from our Berwickshire coast, I >nll not 

 enter upon their arrangement here, though I have no doubt many 

 are to be found within the limits of our coasts. 



The Pyenogonidro Imve been constituted into an order of the 



