Zoological Society. 57 



extremity, beaks, and dorsal edge of a purplish tint possessing a 

 somewhat metalUc histre ; the interior is of a Hght purple tint and 

 somewhat shining lustre ; the ribs are numerous, about 34 in imm- 

 ber, and prominent, and the surface between them is striated longi- 

 tudinally and impressly punctate, the striae extending across one-half 

 the space, the other half being occupied with the pmictations. 

 Hab. India, Capt. Boys. Brit. Mus. 



Sp. 8. EsTHERiA siMiLis, Nobis. 



Carapace-valves elongate obovate ; anterior extremity considerably 

 broader than posterior, which is rather narrow ; beaks very promi- 

 nent, placed very near anterior extremity ; carapace opake ; colour 

 externally and internally the same as m last ; the ribs are numerous 

 and prominent, the first 7 or 8 rather broader than the rest, smooth, 

 and flattish ; the remainder sharply prominent, and having on their 

 surface a row of sharp angular beads ; the surface between the ribs 

 is deeply striated, the strise extending nearly quite across the space. 

 This species differs from the preceding in being smaller, more elon- 

 gate in proportion ; in having the posterior extremity considerably 

 narrower and sharper, and the beaks nearer anterior extremity, and 

 in having the ribs beaded. 



Hab. India, Capt. Boys. Brit. Mus. 



Sp. 9. EsTHERIA TETRACERA. 



Syn. Limnadia tetracera, Krynicki, Bull. Soc. Imp. Nat. Mos- 

 cou, 1830, i;6. t. 7. f. 1, 2. M. Edwards, Hist. Nat. Crust, iii. 

 363. No. 3. 



Isaura tetracera, Joly, Ann. Sc. Nat. 2nd ser. xviii. 



Carapace-valves broadly obovate ; anterior extremity broader than 

 posterior, which is obtusely rounded ; beaks prominent, very near 

 anterior extremity. 



Not havmg seen this species I cannot describe the structure of the 

 carapace. 



Krynicki describes this species as a Limnadia, but at the same 

 time remarks " that it ought to form the type of a new genus." 



Hab. Neighbourhood of Charkow, Russia, Krynicki. 



June 12. — W. Spence, Esq., F.R.S., in the Chair. 



Letters had been received from Richard Hill, Esq., W. C. Kelaart, 

 Esq., R. J. Bourchier, Esq., and Dr. Bland, Corr. Members. 



Mr. Kelaart's letter was dated San Fernando, Trinidad, May 6. 

 Among other interesting intelligence he states that he has " no doubt 

 of the existence of a large Red Monkey, and according to some, of a 

 white one also, inhabiting the woods of this island ; and although no 

 specimens have yet been procured, the promises of several of the pro- 

 prietors give hope of a speedy solution of the question as to what spe- 

 cies these animals may belong." 



Mr. Gray exhibited, from the collection of J. H. Hora, Esq., a 

 female specimen of Ovis Gmelini, from Tauri in the Persian Gulf. 



It was peculiar for the large size of the tuft of hair over the orbital 

 gland, which was closely matted together by the secretion from it ; 



