8 



Gr. O. SARS. 



[No. 1. 



the last pair. — As to the inner organisation, the total want of 

 the lobular liver, filling up a great part of the head in all other 

 known bivavle Phyllopoda, is a very striking character, and the 

 structure of the heart would also seem to differ essentially from 

 that at least in Estheria, as described by several authors. 

 Finally, the propagation and development is quite unlike that in 

 any other known Phyllopoda, agreeing, on the other hand, closely 

 with that in the Cladocera. 



Cyclestheria hislopi (Baird). 



(Pl. I — VIII). 



Estheria hislopi, Baird, Description of some new recent En- 

 tomostraca from Nagpur, collected by the Rev. S. Hi slo p. Pro- 

 ceed. Eoyal Soc. London. Vol. XXVII, 1859, p. 232, Pl. LXIII, 

 fig. 1. 



Limnadia hislopi, G. S. Brady, Notes on Entomostraca 

 collected by Mr. A. Ha ly in Ceylon. Lin. Soc. Journ. Zool. 

 Vol. XIX, p. 294, Pl. XXXVII, figs 1—3. 



Specific Characters. — Shell somewhat tumid, with the valves 

 rather thin and pellucid, irregularly rounded, dorsal line in adult 

 females very strongly curved and sometimes almost angular in 

 the middle, umbones close to the anterior extremity, rather prom- 

 inent, lines of growth in adult specimens 6 — 7. Cephalic crest 

 evenly curved dorsally, rostral part obtusely rounded and finely 

 serrate above. Ocellus nearly as large as eye. Antennæ with 

 both branches seven-jointed, scape provided at the end above 

 with 2 or 3 lamellar expansions, densely supplied with recurved 

 spines. Caudal plate with 7 — 8 pairs of dorsal spines, besides 

 the slender terminal claws, last pair largest and armed at base 

 with a row of about ten small secondary denticles. Colour clear 

 yellowish or corneous, more or less tinged with green. Length 

 of shell in adult females attaining 5*™ height nearly the 

 same. 



RemarJcs. — That the present spedes is really identical 

 with the form described by Baird from India, appears to me beyond 



