380 BULLETIN OF THE 



I find, however, that a species described by Libassi has been confounded 

 with S. maculuta in a way I am not able to untangle, S. peregrina Libassi 

 being named Trochus and Solarium by various contributors to the Jeffreys 

 collection, and Libassi's paper being inaccessible to me. Two species have 

 been sent under that name, one being S. maculata Wood, and the other the 

 broad variety of S. cegleis, both being found in the Tertiaries of Belgium and 

 Italy. To which Libassi's name applies I am not able to say. If to S. cegleis^ 

 it would of course take precedence. 



Leaving this question to be settled by any one having access to Libassi's 

 work, we may now proceed to eliminate other extraneous matters from the 

 synonymy of S. cegleis. Solariella lamellosa Verrill & Smith, and S. amahilis 

 Jeffreys, after careful study of a large series, I now consider distinct from each 

 other, from S. cegleis, and from S. ductus, with which Dr. Jeffreys united his 

 amahilis. Both amahilis and cegleis seem to have occasional finely reticulated 

 specimens with the strong spirals absent. These have been lumped together 

 as var. affinis Jeffreys. I am pretty confident that a larger series of specimens 

 would connnect together Trochus rJiina, rhysus, clavatus, and cegleis oi Watson 

 too closely to be specifically separated, but I have only been able to compare 

 specimens of what I suppose to be S. clavata, rhina, and cegleis, broad and 

 narrow varieties. But these have nothing to do with Trochus Ottoi Philippi 

 {Margarita regalis Verrill & Smith), which has been injudiciously referred 

 to them by Dr. Jeffreys, I presume by a lapsus of memory. For the purposes 

 of this paper I shall keep these supposed varieties separate. 



Solariella cegleis var. lata Dall (?= peregrina Libassi). 



Habitat. Station 208, off Martinique, 213 fms.; off Havana, Cuba, in 400 

 fms. ; Station 2, in 805 fms. Tertiary of Belgium and of Reggio, Italy. Tal- 

 isman Expedition, as " Trochus Ottoi" in Jeffreys collection, 



Solariella (cegleis var. ?) rhina Watson. 



Habitat. Station 2, in 805 fms. ; Station 176, in 391 fms. 



Solariella (cegleis var. ?) clavata Watson. 



Habitat. Station 2, in 805 fms., and Yucatan Strait, in 640 fms. 



The width and height of the shell, the strength of the spirals and tuber- 

 culation, and the size of the umbilicus, are all more or less variable factors, 

 not only in these deep-sea species, but in the ordinary littoral forms, as every 

 collector is aware. 



Solariella infundibulum Watson. 



Trochus {Margarita) infundihulum Watson, Journ. Linn. Soc, XIV. p. 707, Sept., 

 1879; Cliall. Rep. Gastr., p. 84, pi. v. fig. 5, 1885. 



Habitat. Station 41, in 860 fms., bottom temperature 39°. 5. Station 163, 

 off Guadelupe, in 769 fms., sand, bottom temperature 39°. 75 F. U. S. Fish 

 Commission Station 2723, 1886. 



This fine species grows as large as S. Ottoi Phil., or larger, and in sculpture 



