472 PROCEEDINGS OF THE ACADEMY OF [1891. 



after attachment takes place is perfectly planorboid, showing the 

 nuclear shell in the center. 



Locality, Saruga Coast, Japan. 



This species differs from Vermetus imbricatus Dkr. 1 in lacking 

 the imbricating growth-striae of that form. 



V. imbricatus as figured by Dunker is a planorboid form, like V. 

 masier Dh., atra Rouss, etc., but it may possibly be an immature 

 shell. 



T. medusae is apparently allied to V. polyphragmus Sassi, V. denti- 

 ferus Lam. and V. novce-hollandice Rouss., but it differs from them 

 in having the sculpture developed over the whole circumference of 

 the tube, not confined to its upper surface, or the part corresponding 

 to the base of the shell in ordinary gasteropods, as it is in those 

 species. 



The literature of Vermetidce is in a most confused state at present, 

 the labors of Morch being as remarkable for their obscurity as for 

 their extent, and that is considerable. 

 Terebra Stearnsii n. sp. PI. XIX, fig. 5. 



Shell very large, slender and elongated. 22 whorls remaining in 

 the specimen described, the upper portion, comprising probably 

 about one-fourth of the entire length, being broken off. The whorls 

 are flattened, having a narrow but prominent shoulder immediately 

 below the sutures, causing the spire to appear narrowly terraced. 

 The sculpture on the body-whorl consists of a narrow, deeply im- 

 pressed spiral groove, revolving at one-third of the distance between 

 suture and peripheral angle, another less impressed groove below it- 

 at the lower third, the spaces limited by these two grooves being 

 smooth save for slight growth-lines. Midway between the lower 

 groove mentioned and the peripheral angle there is a still deeper 

 groove, with one or two impressed spiral lines on each side of it. 

 The base has numerous (about 15) unequal spiral grooves. 



The color is soiled whitish with a series of brown spots upon the 

 middle and lower part of each whorl. The aperture is small ; col- 

 umella not obviously plicate, nearly vertical above, strongly curving 

 to the left below. Alt. of the decollated specimen 105, greatest 

 breadth 13i mm.; alt. of aperture 12, breadth 7 mm. Japan; 

 exact locality unknown. 



1 V. imbricatus has been re-named Thylacodes adamsii by Morch, Proc. Zool. 

 Soc. Lond. 1865, p. 99. 



