528 EEV. K. Booa watson on the 



Shell. — Short, very broad, narrowed at both ends, little bent, and 

 that almost entirely toward the mouth, very much swollen in 

 the middle, and bulging a good deal on the concave curve, a 

 little more attenuated behind, and very slightly laterally com- 

 pressed (in the proportion of 14 to a little less than 15). It is 

 pretty strong, polished, translucent white, with one, sometimes 

 two opaque rings near the apex. Sculpture. A few very vague 

 and faint, distant transverse lines. Mouth rather large, 

 straight ; edge thin and much chipped. Apical opening small, 

 straight, chipped, narrowed inside by a minute shelf-like pro- 

 jecting ring. L. 0*109. B. at mouth 0*02, thickest 0-04, at 

 apex 0*01. 



This is nearly of the same proportions as G. curtus, except 

 being very much broader ; like that, too, it is narrowed laterally. 

 I have hesitated very much in making it more than a variety ; but, 

 on the whole, think it safer to reckon it as distinct. One speci- 

 men has its breadth exaggerated by a gibbous pad of enamel. 



9. Cadulus ttimidosus, Jefr. 



St. 78. July 10, 1873. Lat. 37° 24' K, long. 25° 13' "W. 

 Azores. 1000 fms. Glohigerina-ooze. 



St. 85. July 19, 1878. Lat. 28° 42' N., long. 18° 6' W. 

 Canaries. 1125 fms. Volcanic sand. 



J. G-wyn Jeffreys, ' Yalorous ' dredgings, Ann. & Mag. N. H. 

 1877, xix. p. 156 :— Erom St. 12, 1450 fms. In the ' Porcupine,' 

 Channel slope, 557 fms. ; Bay of Biscay, 292-1095 fms. ' Jose- 

 phine ' expedition, 110-550 fms. Fossil at Messina. 



Mr. Grwyn Jeifreys verified my determination of this species. 



I have failed to see the callus -rib iu the mouth ; but there 

 is within the posterior opening a circular rib or narrow sharp 

 ledge, which from the outside is seen as an opaque band, but 

 with some difficulty may be seen within as a narrow projecting 

 shelf. The edge of the apex seems to me rather chipped than 

 regularly notched. 



10. Cadultjs exiguus, W. 



St. 24, March 25, 1873. Culebra Island, St. Thomas, D. W. I. 

 390 fms. Mud. 2 specimens. 

 Shell. — Very small, short, broad, pinched in, and projecting at 



both ends ; very slightly bent, and that almost entirely in front ; 



very much swollen in the middle, bulging on the concave curve, 



