MUSEUM OF COMPAKATIVE ZOOLOGY. 159 



of the sutures. The epidermis is well marked ; the interior of the aperture is 

 white, with one obscure and three well-marked plaits, in the Blake specimens. 



Mitra straminea A. Adams. 



Mitra straminea A. Adams, P. Z. S. 1851, p. 132; Sby., Thes. Conch. Mitra, pi. xxv. 



fig. 561, 1874. 

 ? M. pia (Dohrn MS.) Sby., /. c, fig. 550 (an adult ?). 

 1 M. Malleti Petit, Journ. de Conchyl., III. p. 58, pi. ii. figs. 1 a-b, 1852. 



A single specimen of what appears to be this species was dredged off Cuba, 

 at Station 36, in 84 fms. It looks as if it might be a young stage of M. pia, 

 but figures, however good, are to be trusted only with all reserves. 



Mitra (Costellaria ?) styria n. s. 



Plate XV. Fig. 6. 



Shell pale yellowish, white, or pinkish, sometimes with a faint peripheral 

 brownish band, or mottled brown and white; elongated, acute, cancellately 

 sculptured ; nucleus elongated, pointed, glassy, pale brownish, smooth, of about 

 three and a half whorls ; other whorls 10-14, subconvex, with a distinct but 

 not channelled suture; sculpture of about (on the last whorl) 25 slightly 

 flexuous regular narrow even transverse ribs separated by wider interspaces, 

 extending clear over the whorl ; spiral sculpture of (behind the suture about 

 6-10) even threads, separated by squarely channelled narrower interspaces, 

 crossing the ribs and with a tendency to form a nodule at the intersection ; 

 canal rather slender, with seven or eight strong spiral threads externally, which 

 are crossed only by incremental lines ; the tip of the canal is slightly recurved ; 

 internally the outer lip is thin, unreflected, and smooth; deeper in the throat 

 are 6-10 tine spiral elevated lirge, ending in the adult in as many little knobs. 

 On the body whorl near the angle with the outer lip, at certain stages, is a 

 single small elevated callus ; over the surface and on the column the callosity 

 is thin ; the pillar has three well-defined plaits behind its own margin, the 

 posterior the largest; the completely adult may have two more. Lon. of shell, 

 19.0 ; of aperture, 7.0 ; max. diam. of shell, 5 mm. 



Habitat. Gulf of Mexico, off Havana, in 1 19 fms. ; at Station 32, in 95 fms. ; 

 Station 36, in 84 fms. ; at Barbados, in 73-100 fms.; off St. Domingo, at 

 Station 185, in 333 fins. ; Station 262, in 92 fms., near Grenada ; and by the 

 U. S. Fish Commission at Station 2646, near Cape Florida, in 85 fms., sand. 

 Bottom temperatures at the above stations, 44°. to 70°. 75 F. Specimens dead, 

 but in most cases fresh, and probably lived at the depth stated. 



This species varies in the relative strength of the ribs and spiral threads, and 

 the prominence of the intersections ; some specimens are more attenuated than 

 others. The measurements of the description are taken from the most perfect 

 specimen, but, judging from fragments, it attains a size one third larger, and 

 the adult will be proportionally somewhat stouter. 



