158 PYRAMIDELLID/E. 



than 50) which I have examined : operculum thin, exquisitely 

 and closely striated in the line of growth. L. 0-15. B. O05. 



Habitat : Muddy ground, in 7-12 f., Dartmouth 

 (M/ Andrew and Forbes), Southampton (M' Andrew), 

 Exmouth (Clark and Barlee), Torbay (Hanley and 

 others), Fowey (Barlee), Falmouth (Hockin), St. Cathe- 

 rine's Bay, Jersey (Norman). Loire-Inferieure (Cail- 

 liaud) ; Vigo Bay, 4 f. (M f Andrew) ; Spezzia (Marquis 

 J. Doria and J. Gr. J.) ; in sand from Rimini, nearly 40 

 years ago (J. G. J.) ; Algiers (Weinkauff) . 



A specimen which I dredged in Torbay exemplifies 

 the mode of growth under accidental conditions. It 

 had been broken ; and a new outer whorl smaller than 

 the preceding one was added, followed by another which 

 increased in size at the usual rate ; so that the shell had 

 the appearance of being double, one placed above the 

 other. The egg-capsule is semiglobular, attached by its 

 round and broad base, membranous and thin ; when the 

 fry are developed, they find their way out through an 

 oval hole in the centre of the upper part, which then 

 becomes enlarged from what was at first a narrow slit. 



This is the Turhonilla Weinkauffi of Professor Dunker. 

 Parthenia fenestrata, lately described by Mr. Arthur 

 Adams, from Japan, is a different species; such du- 

 plicate names must be changed. 



27. O. excava'ta*, Philippi. 



Rissoa excavata, Phil. Moll. Sic.i. p. 154, t. x. f. 6. 0. excavata, F. & H. 

 iii. p. 305, pi. xcvii. f. 3, 4. 



Shell pyramidal, solid, opaque, rather glossy: sculpture, 

 prominent spiral ridges, of which there are 3 on the main part 

 of the body-whorl, and 2 short ones on the base, the last being 

 close behind the pillar-lip ; the 3 principal ridges are equi- 

 distant, one just below the suture, another in the middle, and 

 the lowermost encircling the periphery ; each of the other 



* Hollowed out. 



