TRICHOTROPIS SEPARATISTA. 45 



T. INSIGNIS, Middendorff. PL 8, fig. 88 ; ? PI. 7, fig. 59. 



Umbilicus small, shell thick, somewhat globose, with undu- 

 lating crenulated spiral ribs, two of them usually more prominent, 

 angulating the body-whorl, aperture margin often crenulated, 

 epidermis light 3 T ellowish brown. Length, 18 mill. 



Behring's Straits. 



The second figure is referred to this species as a lengthened 

 variety by Aurivillius ; it appears to me more like a variety 

 of T. borealis. 



Un figured Species. 



T. MIGRANS, Dall. Near Havana, Cuba. 



Remarkable as the first species of the genus found in tropical 

 waters. 



T. PUSILLA, Gould. (= Fossarus). 



T. PERAMABTLIS, Dall. Sitka. 



T. INFLATA, Friele. North Sea. 



T. ELLIPSOIDEA, Gould. Hong Kong Bay. 



T. d'OiiBiGNYANUM, Petit. (= Coralliophila, Manual, ii, 206). 

 T. TRICARINATA, and T. GRACILENTA, Brazier. N. Australia. 



T. (ALORA) GOULDII, A. Ad. Panama. 



Genus SEPARATISTA, Gray, 1847. 

 S. BLAINVILLEANA, Petit. PL 8, fig. 69. 



Widely umbilicated, membranaceous, pellucid, under a roseate 

 corneous epidermis ; whorls 6, rapidly increasing, broadly tabu- 

 late, periphery with two spiral distant ribs on the spire, and 

 three on the body-whorl ; aperture transverse, a little channeled 

 below. Diam. 10 mill. 



? Marianne Is. 

 S. CHEMNITZIT, A. Ad. PL 8, fig. 70. 



Spire more depressed than the preceding species, with fewer 

 whorls, which are convex, the three peripheral keels closer and 

 not so prominent as in the last species. Diam. 18 mill. 



Philippines. 

 S. GRAYI, A. Ad. 



Spire depressed; whorls with five keels ; aperture transversely 

 oblong; inner lip reflexed, anteriorly rounded. TJnfigured. 



Cape of Good Hope. 



