412 CALLIOSTOMA-EUTROCHUS. 



Margarita asperrima DALL, Bull. M. C. Z. ix, p. 40, 1881. 

 Calliostoma (Dentislyla) asperrimum DALL, ' Blake ' Gasterop., p.. 

 373, and var. dentiferum, t. 23, f. 7, 8. 



C. SERICIFILUM Dall. PL 60, figs. 19, 20. 



Shell delicately but sharply reticulate all over ; two peripheral 

 spirals minutely spinose at the intersections ; columellar tooth present 

 but not strong. Shell thinner and more nacreous than the typical 

 form, and with the radiating and spiral sculpture not differing so 

 much in strength. Alt. 4'5 ; diam. 4'1 mill. (Dall.} 



Off Grenada, in 92 fms. 



Calliostoma (Dentistyla) sericifilum DALL, ' Blake ' Gasteropoda, p. 

 373, t. 24, f. 1, la. 



These species are somewhat puzzling. With the external sculpture 

 and umbilicus of a rather conical Solariella, we find in adult speci- 

 mens a well-marked blunt tooth on the columella, and the aperture 

 opposite furnished with raised lira?. In other specimens these are 

 not visible, but then it is impossible to say that they are completely 

 adult. The sculpture runs the usual gamut of evenly reticulate ; 

 nodose reticulate, the intersections marked by little imbrications 

 while most of the net-work is obsolete; and, finally, of uneven 

 reticulation where the cords one way are much stronger than those 

 by which they are intersected. None of the specimens contained the 

 soft parts, so their relations must for the present remain problematical. 

 The group is hardly Thalotia, being umbilicate ; it is certainly not 

 a Euchelus or Craspedotus. Perhaps the most reasonable conclusion, 

 in the absence of more information, is that this section bears to 

 Thalotia about such a relation as Eutrochus bears to Calliostoma. 

 The tooth is on the pillar, not at its anterior end. (Dall.) 



C. STRIGOSITS (Gm.) Philippi. PL 57, figs. 46, 47. 



Philippi has figured under this name, a conical little species like 

 Calliostoma exasperatum in form and color, but narrowly umbilicated. 

 Whorls 6-7. Alt. 9, diam. 8 mill. 



Coasts of Morocco and Portugal. 



T. strigosiis GMEL., Syst. Nat. xiii, p. 3573, teste PHILIPPI, 

 Conchy 1. Cab., p. 61, t. 13, f. 4. 



C. JERUGINOSUM Philippi. PL 67 ; figs. 81, 82. 



The exactly conical, pretty thin shell consists of 7 completely flat 

 whorls, which are beset on the acute basal carina with spines ; 



