1921] NATURAL SCIENCES OF PHILADELPHIA. 315 



Atlanta cordiformis Gabb. Text-fi?. 14. 



Atlanta cordiformis Gabb, Trans. Amer. Philos. Soc. xv, 1873, p. 201. 



A very minute species, composed of 4| whorls, the last carinate 

 and bearing the usual peripheral lamina, which is mainly broken 

 away. The aperture is cordiform, its inner edge in contact with 

 the preceding whorl, not supported on the peripheral lamina. This 

 may be a feature of immaturity. It is a much smaller shell than 

 A. peronii having the same number of whorls. 



Diameter 1.5, greatest width of aperture 0.55 mm. 



Type and tAvo other specimens are no. 2896 A. N S. P. 



Atlanta peronii Leseuer. 



Two small specimens, the largest 3.7 mm. in diameter. It is evi- 

 dently adult, somewhat over half a whorl being in contact with the 

 peripheral lamina only. On account of its small size, the reference 

 to A. peronii is made wdth some doubt, yet in other characters we 

 find no material difference. 



PROSOBRANCHIATA. 



TEREBRIDAE. 



The larger Terebras of Santo Domingo are in some confusion, 

 owing chiefly to the absense of figures of the types of three species 

 described by Sowerby. Guppy" figured " T". sulcifera Sowerby, " 

 from the Heneken collection, but as he united sulcifera, inequalis 

 and hipartita of Sowerby, we do not know definitely which was fig- 

 ured, nor whether his shell was from the original or the second 

 Heneken collection. The T. hipartita of Dall ^^ appears to us to be 

 a difi^erent species from that of Sowerby. 



Gabb 's identifications were apparently erroneous. His T. inae- 

 qualis is T. haitensis of Dall,i^ and his hipartita is the form we refer 

 to inaequalis Sowerby, T. rohusta Hinds, of Gabb, is T. gabbiDaW, 



13 Quarterly .Journ. Geol. Soc. vol. 32. pi. 29, fig.8. 



" Terebra (Acus) hipartita Sowerby, Dall, Proc. U. S. Nat. Mus. xviii, p. 38, 

 with vars. spinifera, oligomitra, and cirrus, Trans. Wagn. Inst, iii, pi. 59, figs. 13, 

 28, 29. 



15 Terebra (Hastula) haitensis Dall, Proc. U. S. Nat. Mus. xviii, p. 35. Terebra 

 (Oxytneris) hipartita, etc., Dall, Trans. Wagn. Inst, iii, pi. 59, fig. 30; Potrero, 

 Rio Anima, Santo Domingo. 



" Terebra gabhi Dall, Proc. U. S. N. M. xviii, p. 34; Trans. Wagn. Inst, iii, pi. 59, 

 fig. 31; Portrero, Rio Anima. T. rohusta Hinds, Gabb, Trans. Amer. Philos. 

 Soc. XV, p. 224. 



