Zoological Society. §& 



20 to 26 in number. When viewed under the microscope, the 

 structure of this carapace presents the following appearance : the ribs 

 are strongly marked and are somewhat prominent, the lower edge 

 being beaded or ornamented with a line of raised round dots of a 

 rather regular figure. The surface between the ribs is slightly con- 

 cave, and is marked very distinctly with numerous raised -do^s^ or 

 punctations of a rather irregular form and size. ' ' ^^'^^1^^ vi 



Hab. Strasbourg, Hermann. Toulouse, Joly. Oran, M. ^rdi^Hd. 

 Algeria, Lucas. Regency of Tunis, Mr. Frazer. Brit. Mus. ^5'>^ 



That this is the Baphnia yigas of Hermann I think there is ob 

 <J(iubt, and quite diiferent from the Limnadia Hermanni of Bron- 

 gniart. The body of the Limnadia is entirely enclosed within a cara- 

 pace, regularly oval, transparent, and of a whitish colour. That of 

 the Baphnia gig as, according to Hermann, is enclosed within a cara- 

 pace of the colour of amber, horny, transparent, oval, with the back 

 gibbous, keeled, and edged with brown. The carapace of the Lim- 

 nadia is smooth, or offering only two or three zones parallel to its 

 free edge. That of the Baphnia gigas has 7 rings or parallel zones 

 on the two lower thirds of its body, and to judge from the figure 

 given by Hermann, has several more on the upper portion. In struc- 

 ture and form it thus agrees with the characters of the genus Estheria, 

 and appears to me to be perfectly identical with the Isaura Cycllir 



doides of Joly. ? , ■ , p ^^^ 



^ ^■'- inuis&o ;iiB§'io rnioinyq 



^^ Sp. 2. ESTHERIA MeLITENSIS, Nobis. 2=!' T*.; *),. roiol ill fn\h(U 



^^-Carapace-valves of an elongated oval form, considerably narrower 

 m the posterior than the anterior extremity ; of a light horny colour, 

 and semitransparent. Anterior extremity rounded ; the beaks si- 

 tuate near that extremity and prominent, causing that part of the 

 shell to be much more convex than any other portion. Ribs some- 

 what prominent, the surface between them slightly concave and com- 

 pletely covered with numerous very small dots or raised punctations 

 of rather a regular figure. The lower edge of each rib is beaded like 

 the last, but the dots are smaller. The shell is considerably more 

 elongated than in preceding species, and the beaks are more pro- 

 minent and rather nearer the anterior extremity. The colour is 

 much lighter ; the ribs rather less prominent, and the punctations 

 on the intermediate spaces much smaller and a great deal more nu- 

 merous. 



Hab. Pool of rain-water at Malta, Rev. Mr. Hennah. Brit* Mus. 



Sp. 3. ESTHERIA POLITA, NoblS. f f p ^J^^g* 



Carapace-valves obovate, resembling in form the shell of a Pisiavum. 

 Anterior extremity somewhat broader than posterior, much more 

 convex and gaping. Beaks prominently elevated, and situated near 

 the anterior extremity. The shell is of a light yellowish horny co- 

 lour internally and externally, and of a fine glossy polished appear- 

 ance and finely pellucid. The ribs are numerous, about 27 in num- 

 ber, elevated, and smooth. The spaces between are slightly concave, 

 and are beautifully dotted with numerous sri^all ipij^rfss^d ^^y^aii^ti^]^. 

 u Hab. India, Captain Boys. Brit. Mu^, b^iijjfrr sta Ei^riar owt 



