322 REPORT OF A CRUISE IN H.M.S. "RESEARCH'* 



Addendum hij the Rev. Canon Norman^ D.C.L.^ F.L.S. 

 Solarium mediterraneum, Monterosato. 



1873. SOLAEIUM Mediteeranexjm, Monterosato. Notizie iutorno ai Solarii del 



Mediterraneo, p. 6, figs. 8, 9. 



A single living specimen dredged in 400 fath., 50° 29' 26'' N., 

 11° 4' W. 



In his ^' Porcupine ^^ paper Jeffreys considers Monterosato's species 

 to bea varietyof S.pseudo-jjerspectivum, Brocchi {8. discus, Philippi). 

 It may be so^ but I prefer to retain Monterosato's name liere because 

 it indicates that the first specimen taken in the British seas is refer- 

 able to that particular form. It is distinguished from S. pseudo- 

 perspectivum as follows : The comparative height is somewhat greater, 

 the umbilicus more contracted, the periphery more acutely keeled, 

 and the mouth consequently more pointedly produced in the position 

 of that keel. The u^pper surface is much smoother, presenting little 

 trace of sculpture beyond a faint spiral line (the corrugated ribs of 

 pseudo-perspectivum being absent) ; this under surface, on the other 

 hand, is more sculptured, the exterior half of the whorl bearing about 

 ten fine riblets, of which the outer two show some signs of corruga- 

 tion. Height 7 mm., width 12 mm. 



This is a second species of this genus added to our fauna. Two 

 living specimens of Solarium siculuni, Cantraine, were dredged by 

 the " Porcupine," 1869, lat. 51° 1' N., long. 11° 21' W., in 458 fath. 



The Mediterranean specimens with which I have compared the 

 Irish specimen of S. mediterraneiim are accurately represented by 

 Philippi's figure of S. discus ; but Brocchi's figure of 8. pseudo- 

 perspiectivum represents a shell of which the upper surface is smooth 

 or nearly so, and in this respect like 8. mediterraneiim, but it wants 

 the riblets of the under surface characteristic of the latter form. 



Family TURBINID^. 



Genus Leptothyra, P. P. Carpenter, M8. (Dall, 1871) = Collo7iia, 

 Philippi (non Collonia, Gray, 1852) = Homalopoma, P. P. Car- 

 penter, 1864 = Leptonyx, P. P. Carpenter, 1864 (non Leptonyx, 

 Swain, 1821). 



Dall, in his Report on the " Blake " Mollusca (Bull. Soc. Comp. 

 Zool., xviii, p. 352), by a slip of memory says in a note, *' The name 

 Homalopoma was under consideration by Dr. Carpenter as a substi- 

 tute for Leptonyx, but was never published by him." The fact is 

 that Homalopoma was the first term used by him {8'upp. Report 



