308 EEPORT ON ALBATROSS MOLLUSCA DALL. 



closer, and obscure, being over-ridden by the spirals which they mi- 

 nutely undulate; the fasciole is slightly impressed and extends to the 

 suture, which is distinct but not channeled; the notch is shallow and 

 gently rounded; the outer lip arched forward, sharp; the body cov- 

 ered with a tbin glaze, in the aperture ; the pillar tbin, twisted, not 

 pervious; canal short, distinct; maximum longitude of specimen 16; 

 maximum latitude 8 mm . 



Hab. — Stations 2807 and 280S, near the Galapagos Islands, in the 

 Pacific, in latitude 0° 24' south and longitude 89° 6' west, in 812 and 

 634 fathoms, globigerina ooze and coral sand ; bottom temperature 38°.4 

 to 39o.9 F. 



This pretty little species is much like P. engonia Verrill, from deep 

 water off the New England coast, but differs from it in having a finer 

 and more elegant sculpture, rounder whorls, without the prominent angle 

 on the shoulder of P. engonia, a narrower fasciole inclined to the suture 

 at a greater angle, and a narrower and more differentiated canal. In P. 

 ■engonia the ripples on the fasciole are strongest near the suture and are 

 not very regular, while in the present form their regularity is conspic- 

 uous and they extend witbout weakening entirely across the fasciole. 



Pleurotomella Agassizii Verrill, var. permagna. 



Hab. — Station 2731, 124 miles southeast of Delaware Bay, alive, in 

 841 fathoms, soft mud, temperature 38°.5 ; and Station 2754, east of 

 Tobago, in 880 fathoms, ooze, north latitude 11° 40' and west longitude 

 £8° 33'; temperature 37°.9 F. 



This fine form resembles Pleurotomella Agassizii in general characters, 

 and even in the rosy-brown tint of the columella, but in a specimen of 

 each, with the same number of whorls, we find P. Agassizii has a length 

 of 28 and a maximum breadth of 12.5 mm , while the variety permagna 

 has a length of 35 and a breadth of 17.5 mm . Some specimens of P. per- 

 magna reach a length of 47 and a breadth of 22 mm . The number of 

 transverse riblets on the last whorl varies in both species; in P. per- 

 magna there are eighteen to thirty. I have not seen any of the typical 

 P. Agassizii with more than twenty ribs. 



P. permagna differs from P. Bairdii in just the characters, except size, 

 that P. Agassizii does, and from P Agassizii it is distinguished only by 

 its much greater size. The two may be distinct species or they may be 

 two races of one species. Knowing the great variability of abyssal 

 shells, 1 prefer to take the latter view for the present. 



Pleurotomella suffusa sp. nov. 

 Plate xii, Fig. 10. 



Shell small, slender, fusiform, the pillar suffused with yellowish pink, 

 the exterior white, with a thin, pale epidermis and seven or eight whorls, 

 without counting the nucleus; specimen somewhat eroded on the upper 



