270 REPORT ON ALBATROSS MOLUCCA LULL. 



lamina is strengthened by a buttress from the ventral edge of the hinge ; 

 below the middle lamina is a deep pit; another pit is found above the 

 anterior lamina ; the ligamental groove is well marked. In the left 

 valve the middle tooth is thick and bent but with no pit below it; a 

 deep notch separates it from the anterior lamina; behind or above 

 these two is a deep irregular groove; the posterior lamina is independ- 

 ent, straight, short, with a deep groove between it and the surface to 

 which the ligament is attached. The altitude of a young but perfect 

 specimen is 20; the length 28; aud the diameter 12 rara . Fragments 

 show that the species attains nearly twice this size. 



II ab.— IT. S. Fish Commission Station 2754, east of Tobago, in 880 

 fathoms, globigerina ooze; bottom temperature 37°. 9 F. 



Figures 8 and 9 show the hinge of a well grown specimen. A view 

 from below of the hinge of the right valve, from a fragment of a still 

 larger specimen, shown by Fig. 7, will assist in making clear the com- 

 plicated mechanism of the hinge. 



This species, compared with the typical Callocardia, shows how short 

 is the interval which in some cases separates species with a deep pallia! 

 sinus from species with none; another instance is the relation of Vene- 

 riglossa Dall (Atopodorita (Jossman) with Cytherea. It is probable that 

 neither of the Callocardkv have long siphons, though one has retractor 

 muscles aud the other none, or none to speak of. These characters are 

 like the branclme, essentially adaptive and relatively superficial, and 

 can no longer be regarded as of high systematic importance, except 

 when correlated with other more fundamental features. 



It is rather curious that a close inspection shows that the cardinal 

 teeth of a young Isocardia cor. L. are more like those of Vesicomya 

 than like those of Kelliella miliaris, with which Jeffreys confounded the 

 young of the first mentioned species, to say nothing of Kelliella having 

 not the slightest trace of a lateral tooth. 



This species is named in houor of Prof. L. A. Lee, in charge of the 

 scientific work on the Albatross. 



VENERIGLOSSA Dall. 



Veneriglossa (subgenus of Cytherea) Dall, Bull. Mus. Comp. Zool., xii, p. 275, 1886. 

 Atopodonta Cossmaii, Mem. Soc. Roy. Mai. Belg., xxi, p. 110, 1887. 



Veneriglossa vesica Dall. 



Plate xiv, Figs. 8, 12. 



Cytherea ( Veneriglossa) vesica Dall, op. cit., p. 275, xvm, p. 440, 1889. 



Hab.— Gulf of Mexico and West Indies, in 81 to 100 fathoms. This 

 problematical shell is figured here for comparison with the preceding 

 species of Isocardiacea. 



