p 



Dr. Baird on the genus Cypridiua. 21 



II. — Note on the genus Cypridina, M. Edwards; with a de- 

 scription of two new species. By W. Baird, M.D., F.L.S. &c. 



[With two Plates.] 



The genus Cijpridina was founded by M. Edwards in 1838, in a 

 note to the second edition of Lamarck's * Hist. Nat. An. sans 

 Vcrtebres/ and was afterwards more fully detailed in the third vol. 

 of his ' Hist. Nat. des Crustacees.' The animal resembles a good 

 deal in its general form and structure that of the genus Cypris. 

 From his observations however it appears to have two eyes, di- 

 stinct from each other ; two pairs of antennse, both pediform ; one 

 pair of natatory feet, and a peculiar organ apparently for support- 

 ing the ova, similar in purpose to, but differing in structure from, 

 the second pair of feet in the Cypris. In 1840 M. Philippi pub- 

 lished a paper in the sixth vol. of the ' Ann, and Mag. Nat. Hist.' 

 in which he describes and figures a small Entomostracan allied 

 to the genus Cypris, and to which he gives the name of Aster ope. 

 In some of its characters as given by him, it differs from the 

 Cypridina of Edwards, — points of difference which he particularly 

 mentions, — but in others it resembles it very closely. I have very 

 lately had opportunities of examining two species of Entomo- 

 straca which I can only refer to the genus Cypridina, and which, 

 upon dissection, I found in several of its parts to partake of the 

 nature and form of that genus, and in other parts to resemble 

 Asterope. From this mixture of the characters of the two genera, 

 and taking into consideration the minuteness of the parts ex- 

 amined, and the different appearance these same parts assume in 

 different positions under different microscopes and with different 

 observers, I am inclined to believe these two genera to be iden- 

 tical. Waiting however till better opportunities occur for exa- 

 mining these little creatures, I shall content myself at present 

 with describing two new species that have lately occurred to me. 



Sp. 1st. Cypridina MacAndrei. PI. VI. B. figs. 1, 2. Shell of 

 an oval shape ; the two extremities prolonged into sharp points ; 

 that of upper extremity curved and projecting forwards and a 

 little upwards, that of inferior extremity projecting a little back- 

 wards. The whole shell is dotted over with small spots. On 

 anterior edge near the upper extremity the shell is deeply notched, 

 ""t is smooth and of a light colour (dry). 



Several specimens of this little animal were placed in my hands 

 by Mr. M'Andrew, who di-edged them in deep water off the Shet- 

 land Isles. They were preserved diy, the whole animal being of 

 the size of a small pin's head, and the shell being tolerably hard, 

 'n consequence of having been kept thus dry for a considerable 

 me, the animal had become so shrunk that it was with consi- 



