Chasteu — On the MoUusca obtained hij the R.I.A. Cruises. 23 



Var. LACTOiDES (Monterosato MS.)- 



This form, characterised by its regularly conical outline and 

 broad base, represents one extreme of a series, at the other end 

 of which is T. delicata, Monterosato. Every intermediate gra- 

 dation exists between the two. Like so many other common 

 and widely ranging species T. pusilla varies greatly, and to 

 attempt to separate the more marked varieties as distinct species 

 is both unscientific and confusing. 

 EiJLiMKLLA sciLLJE, Scacchi, sp. {Melanio). 



Stations [VII.], YIII. Logs 21, 33 ; depth, 40 to at least 

 370 fathoms. Eidimella is, as Professor Verrill has pointed 

 out, scarcely worthy of separation from Turlonilla. Both 

 typically have the same microscopic spiral strise and all other 

 characters in common. Turlonilla di:ffers only in its longi- 

 tudinal ribs. These are absent on the lower whorls in some 

 species, and are wanting on the upper half of the shell in a 

 form I have from Delos. They consequently form a poor 

 character on which to base a genus. 

 E. coMMtJTATA, Mouterosato, = acicula, Philippi, 1836, non Lamarck, 

 1815. 



Logs 9, 11, 12, 16, 22, 26, 28, 33, 42, 50, 53, 55, 63, 70; 

 depth 7-120 fathoms. The specimens found exhibit a good 

 deal of variation in their characters. 

 Var. VENTiiicosA, Eorbes v. 



Logs 17, 18, 20, 33, 53 ; depth, 52^-110 fathoms. I^o in- 

 termediate specimens occurred connecting the variety and 

 type. These appear to have become distinct in the district 

 investigated. They are easily and completely connected in 

 certain other British areas. 

 E. ifiTiDissiMA, Montagu, sp. {Turho). 



Station YIII. Logs 6, 15, 25, 40, 62. Very rare in the 

 dredgings examined. 

 Ptegostelis iNTEEKUPTA, Totton, sp. [Turhonilla). 



[Station III.] Logs 18, 30, 42. A few fragmentary 

 examples. 

 P. scALAEis, Philippi, sp. {Melania). 



Log 6, A single broken specimen. 



Var. EDTESCENs, Forbes, v. 

 Los 50. 



