378 BULLETIN OF THE 



42.0 wide), is covered with a delicate green epidermis, which erodes like that 

 of a fresh- water shell, and exhibits a nearly circular aperture with a somewhat 

 reflected lip and brilliantly pearly throat. There is no callus across the body 

 nor any umbilicus. The shell bears a singular resemblance to a very large thin 

 greenish Vivipara or Tulotoma. It is one of the finest animals collected on 

 the Albatross voyage, and was found in about four hundred fathoms, off the 

 coast of Southern California. 



It will be named Turcicula Bairdii in honor of the late U. S. Fish Commis- 

 sioner, Prof. Spencer F. Baird. A larger variety or closely related species was 

 dredged at about the same depth off the coast of Peru. 



Section BATHYMOPHILA Dall. 

 Margarita (Bathymophila) euspira Dall. 



Plate XXXII. Fig. 8. 



Margarita 1 euspira Dall, Bull. M. C. Z., IX. p. 44, 1881. 



M. {Bathymophila) euspira Dall, and var. nitens Jeffreys (MS.), Bull., //6. cit., p. 102, 

 Oct., 1881. 



Habitat. Station 2, in 805 fms. 



This species seems to be widely spread over the North Atlantic, and was 

 taken in considerable numbers by the Porcupine and Valorous Expeditions. 



It would seem as if the coronated form was less abundant than that not so 

 ornamented, judging by the specimens in the Jeffreys collection. The young 

 ones are often strongly spirally ridged, and it will be remarkable if they do 

 not get described as a Cyclostrema on their own account. 



The only species with which this is likely to be confused is Umbonium 

 Bairdii^ in which the whorls are much less rounded, being appressed to an 

 even slope I'rom the apex to the periphery, while in M. euspira the suture is 

 very distinct, and even in the coronated variety the whorls round down to it. 

 On the base M. euspira has no large callus, its callus being confined to the 

 surface of the pillar, and not a pad filling the umbilical basin. M. euspira is 

 larger and proportionally more elevated, and the young have a wide umbilicus. 

 It is also more pearly than the other. 



I doubt extremely whether this little shell is related to Oxystele, as some of 

 my conchological friends would have it; but whether the sectional name pro- 

 posed for it be worth retaining or not, I propose to suspend judgment until 

 I can get hold of some specimens preserving the soft parts. 



Subgenus SOLARIELLA A. Adams. 



Solariella amabilis Jeffreys. 



Trochus amabilis Jeffreys, Brit. Conch., III. p. 300 ; V. pi. Ixi. fig. 6. 



Habitat. Station 46, in 888 fms. ; Yucatan Strait, in 640 fms. ; Station 41, 

 in 860 fms.; Station 2, in 805 fms.; Station 21, in 287 fms., living; Station 



