OF CONCHOLOGY. 129 



specimens as abundant as the nominal species, but the characters, 

 singly, are interchanged without limitation. With regard to 

 Gr. laeunata alone I am in doubt, as I have not found a complete 

 connecting series with the type, but it may very possibly be only 

 an extreme individual variation. It is due to Dr. Carpenter to 

 state that he worked from very few and often imperfect speci- 

 mens, and I am inclined to think that he would agree with the 

 present consolidation, from the labels which he has attached to 

 the varieties which I forwarded for his inspection. 



I have adopted lirulata as the name for the species in ques- 

 tion, as it appears to be the earliest of the published names. 

 The nominal forms graduate into and interchange characters 

 with each other to a marvellous extent. 



Gibbula Canfieldi, n. s. 



? Calliostoma Canfieldi, Dall, MSS. 1866. 



Shell of seven whorls, the last whorl comprising more than 

 half the shell. Above, sutures small but deeply channelled ; 

 whorls smooth, with three revolving ribs close to the suture, 

 also three or four on the lower part of the whorl. 



Color pearly, with bronze yellow pencillings obliquely to the 

 suture. Surface of the whorls rather flattened, semicarinated, 

 convex. Shell umbilicated with nine basal revolving ribs. Um- 

 bilicus strongly carinate internally, smooth, narrow and small. 

 Aperture rhomboidal, pearly, with grooves answering to the 

 exterior ribs. Columella straight, with a slight callosity, but 

 not reflected. 



Min. diam. -3, maj. diam. -4, alt. -4 in. Defl. 70° 40'. 



One specimen of this modest little shell was found dead on 

 the beach at Monterey. I take pleasure in dedicating it to Dr. 

 C. A. Canfield of Monterey, who has done much for science 

 with very slender means. (Dall, MSS. 1866.) The typical 

 and unique specimen of this species was forwarded, in 1866, to 

 Dr. Carpenter, who pronounced it to be distinct, but has not 

 returned it. I am therefore unable to institute comparisons 

 with other species. 



Chlorostoma brunneum, Phil. 



Trochus rustieus, Kiener ? not Gmelin. 



Abundant at Monterey. This species is very variable. The 

 surface is usually smooth, but in some specimens it is marked 

 with fine revolving ribs as in 0. Pfeifferi. The young and some 

 adults have a rather strong basal rib outside of the umbilical 

 region and bounding it. 



