112 Description of Two New Species of the Genus Batissa. 



XYI. — Description of TWO NEW SPECIES of the Genus 

 Batissa, ^vith Notes 07i that Genus. 



Bt Temple Prime. 

 Kead December 12, 1859. 



The genus Batissa was established a few years ago by Gray 

 for a class of the genus Cyrena, represented by the Cyrena 

 violacea Lamarck, which he thought differed sufficiently from 

 Cyrena to constitute a distinct genus. Since then the genus 

 Batissa has been adopted by Deshayes in the Proceedings of 

 the Zoological Society of London, 1851:, and by the brothers 

 Adams in their recent work. 



The species of this genus, of which I append a list, are as 

 yet not numerous. 



Batissa ^ig-antea Prime. 



T. ovato-orbiculari, oblique insequilaterali, tuinida, solidissima, magna, 

 intus alba, epiderinide brunnea vestita, sulcis remotis, umbonibus pro- 

 minentibus, antice inclinatis ; dentibus cardinalibus tribus, intequilatera- 

 libus, brevibus, crassioribus ; lateralibus angustis, serrulatis. 



Long. 5|-, lat, 4|, diam. 2^ inches. 



Hah.— ? Collect. Jay. 



This is the largest known species of this genus. One speci- 

 men, which is in the collection of Dr. Jay, was brought to this 

 country by the Expedition sent to Japan under Commodore 

 Perry, without, however, any data as to the locality where it 

 was found. 



Li general outline it bears some resemblance to the B. insignis, 

 Deshayes. 



Batissa similis Prime. 



T. ovato-orbiculari, oblique inajquilaterali, tumida, solida, depressa, 

 intus superne alba, postice inferneque violacea, epidermide nigra vestita, 



