N E I L 0. 



Genus NEILO, Adams. 



Tatta biaalvis, himusculosa, transverse ohloiiga, concen- 

 trice lirata, utrinque clausa, Margo cardinalis 

 dentihus numerosis erectis utrinque arinatns. Liga- 

 inentum externum, conspiciium. 



Shell bivalve, bimuscular, transversely oblong, con- 

 centrically ridged, closed at both ends. Hinge 

 margin armed with numerous erect teeth on both 

 sides. Ligament external, conspicuous. 



Species. (Fig. 4, Mus. Cuming in Brit.) 



Neilo australis. Nei. iesid snbrhombed, verilricosd, 

 concentrice tenuiter lirata, incequilaterali ; latere 

 postico oblongo, recto, oblique angulato, inter 

 angulum umbonalem et marginem dorsalem depresso ; 

 margine dorsali produeto, margine tenninali suprd 



rostrato, infrd, subtnincato ; vmbonilnis 2>rominen- 

 tibus, margine ventrali rectivsculo ; latere antico 

 hrevi, supe7'ne angulato. 



The AUSTRALIAN Neilo. Shell subrhomboidal, ven- 

 tricose, concentrically finely lirated, inequilateral ; 

 posterior side oblong, straight, obliquely angular, 

 depressed between the umbonal angle and the 

 dorsal margin ; dorsal margin produced, terminal 

 margin rostrated above, subtruncated beneath ; 

 umboes prominent, ventral margin rather straight ; 

 anterior side short, angular above. 



QuoT ET Gaimard (Nucula), Voyage de I'Astrolabe. 



Neilo Cumingii, A. Adams. 



Ctenoconcha naciaila, Valenciennes. 



Hab. New Zealand. 



This shell has very much the form of the Arctic 

 yoldia, but like Solenella, it presents the character of 

 an external ligament and no cartilage pit. 



