MARSHAI.L : ADIHTIOKS TO "liRI'l'lSH CONCHOI.OGY. 173 



do Mr. Du[)rey or Mr. Maiciiiand enumerate il in their lists, so that 

 Jeffreys' record emphatically reciuires confirmation. 



O. interstincta Mont. — Straits of Korea 4 if. and 54f., at the 

 latter depth associated with the var. s/zt/^nz/ts (H..M.S. 'Sylvia') ! 

 var. moulinsiana Fisch. — Tenby. 



Montagu's original figure of O. inferstiyicta is a poor one of a 

 nondescript form, and was probably taken from a specimen of the var. 

 inter mixta Monts. 



O. spiralis var. coarctata Marsh. — Freshwater West. By some 

 errors of punctuation on the part of the printer, my previous note on 

 this variety became unintelligible.^ It should read — "Found very 

 sparingly with the type, but is most prevalent at the mouth of the 

 Clyde \ and off the Mull of Cantire, in 60 fathoms, all the specimens 

 belong to this variety." 



O. eximia Jeff. — I detected half-a-dozen specimens of this very 

 rare little shell in some material received from Mr. Simpson, which 

 had been trawled off the Flugga Light, at the northern extremity of 

 the Shetlands. Its record from the Clyde arose from an error. 



O. fenestrata Forb. — Teignmouth. 



O. scalaris var. rufescens F. & H. — Off Loch Ryan 2of. 



O. lactea L. — Benbecula Sound lof. 



O. innovata Mont=. — Aldcmey (Marquand) ! 



O. verticalis Marsh. — A figure published of this species^ is a 

 photo only, and does not convey more than the general aspect and 

 form of the shell ; as such it cannot be differentiated from its congeners. 



O. multilirata Monts. ^ — This is well figured from a photographic 

 point of view, l)ut not suitably for scientific purposes, the character- 

 istic sculpture and the embryo not being made comparable with its 

 congeners. 



O. delicata Monts.— Another figure of this shell has also been 

 published,-^ but it cannot be commended except as a photo. It is a 

 coarser specimen than usual, and not quite mature, the aperture not 

 being formed ; but it is the only figure I know which exhibits the 

 "ribs exquisitely dentellated at the suture," a character pointed out 

 by Monterosato. 



Finding some difficulty in determining the identity of O. lactdides, 

 O. innovata, O. pusilio, and O. delicata, a writer thinks to simplify 

 matters by pronouncing them one species, with the added warning 

 that any attempt to separate them as distinct is "unscientific and 



1 Journ. 0/ Conch.., 1900, vol. 9, p. 



2 Journ. ofC<^nck., 1912, pi. 5, fig. 



3 Ibid., fig. 7. 



4 Ibid., fig. §, 



