History of British Entomostraca. 331 



racter. — Antennis furcatis ; capite brevi-rostrato ; manibus unguiculatis ; 

 ovario externo unico, magno. 

 Habitat — Berwick bay. 



Description. — Body and tail distinctly separate from each other, 

 of ten segments, the first the largest, the last terminating in two 

 short lobes from which issue two long setae, more than half the length 

 of the body, and two others about half the length of the former. First 

 segment furnished with a short beak. Antennae very distinctly fork- 

 ed, consisting of about seven or eight articulations. Fork taking 

 place at fourth articulation — upper limb not articulated, longer than 

 lower limb, which is divided into three or four articulations. Each 

 articulation throws upwards and forwards a tuft of short setae. An- 

 tennules of two joints, the latter terminating in three or four pret- 

 ty long setae. Mandibles were not seen. Hands of two articula- 

 tions and a curved hook pointing upwards, as in minutus. Thoracic 

 or first pair of feet (Fig. 28) have the superior or external stalk the 

 longer of the two, of two joints, first short, second longer, having a 

 strong tooth or process on inferior edge, and terminating in three or 

 four short curved setae or hooks. Inferior or internal stalk of three 

 articulations ; first short and thick ; second longer and broad ; third 

 short and terminated by two pretty long straight setae or hooks, and five 

 or six curved ones, each gradually becoming shorter than the others. 

 Abdominal legs as in the other species above-mentioned. Fulcra 

 or supports have the appendage or finger in the form of a long, 

 slender, slightly curved stalk, toothed or serrated on the upper edge, 

 and terminating in three or four hairs. The external ovary is single, 

 large, and generally lying across the tail, in consequence of which 

 perhaps the insect generally swims prone or supine, seldom swim- 

 ming on lateral surface, as most of the other species do. I have 

 only met with three or four specimens of this species, all females ; 

 and in two or three of these, there was attached to the dorsal sur- 

 face of the fourth segment of the body, a substance very much re- 

 sembling a polype (Fig. 26,) consisting of a pedicle and three branch- 

 es, each branch terminated by four short fingers. 



7. Cyclops depressus. Plate X. fig. 9-12 Nova species Specific Character. 



Corpore lati-depresso ; antennis brevibus ; cauda biloba, setis duobus bre- 



vissimis instructa. 

 Habitat. Berwick bay. 



Description. — Body depressed, flat and broad, differing in this 

 respect very much from all the other species described ; of four seg- 

 ments, the first of which is much the largest, being more than equal 

 to the three succeeding ones, and having the upper part projecting 



