254 BULLETIN OF THE 



Section NEILONELLA Dall. 

 Neilonella Dall, Bull. M. C. Z., IX. p. 125, 1881. 



Shell like Tindaria Bellardi, with a single ligament directly between the 

 beaks, chiefly external, but its base dividing the hinge-line, while its upper 

 surface extends about equally before and behind the beaks. Type Leda 

 {Neilonella) corpulenta Dall. 



This section is almost exactly intermediate between Leda, with an inner and 

 outer ligament, and Tindaria, with a purely external one. 



Leda (Neilonella) corpulenta Dall. 



Leda (Neilonella) corpulenta Dall, Bull. M. C. Z., IX. p. 125, 1881. 



Plate VII. Figs, la, lb. 



Habitat. Station 23, 190 fms., living, bottom temperature 64°.0 F.; Station 

 21, 287 fms. ; Station 47, 331 fms.; Sigsbee, off Havana, 450 fms. 



No additional specimens of this interesting form have turned up in the col- 

 lection ; it probably lived at all the stations mentioned, though valves only 

 were obtained except at Station 23. There is nothingr like it, recer* or fossil, 

 in the Jeffreys collection. 



Genus MALLETIA Desmoulins. 



Section TINDARIA Bellardi. 



Malletia (Tindaria) cytherea Dall. 



Nucida (Tindaria?) cytherea Dall, Bull. M. C. Z., IX. p. 123, 1881. 



Malletia veneriformis E. A. Smith, Chall. Rep., p. 246, pi. xx. figs. 9, 9 a, 1886. 



Plate VIII. Figs. 1, 1 a. 



Habitat. Off Cape San Antonio, 413-424 fms.; Yucatan Strait, 640 fms.; 

 Station 226, near St. Vincent, in 424 fms. ; and Station 2392 of the U. S. Fish 

 Commission in the Gulf of Mexico, Lat. 28° 45', Lon. 87° 30' W., in 724 fms., 

 mud, living, bottom temperature 40°.7 F. 



The original specimens from ■which this species was described were single 

 valves, subiridescent with decay. The supposed minute pit proves pathologi- 

 cal. The reception of two magnificent specimens from the Fish Commission 

 dredgings enables me to correct my erroneous reference of the species to 

 Nucula, which I regret the more since it may have led my friend Mr. Smith 

 into a redescription of the species. 



