MOLLtrSCA OP THE ' CHALLENGEB' EXPEDITION. 385 



higher, the canal in front is much narrower ; finally, Lesson's 

 species has tico embryonic whorls, and these stand up much higher 

 than in this. 



The Eev. J. E. Tenison Woods, in a very interesting paper 

 (read before the Eoyal Society of N. S. Wales, July 4, 1877, and 

 of which he obligingly sent me a copy) on the Tertiary deposits 

 of Australia, p. 8, refers to a fossil Fusus occurring in the lowest 

 clays of the Australian Tertiary deposits of lower Miocene, or 

 perhaps Eocene, age. Of this Fusus he says that " it is so like the 

 beautiful and delicately spined IP. -pagodus of the Philippines, that 

 it has I believe been named F. pagoddides by Prof. M'Coy." I 

 have not been able to ascertain that this spcies has ever been 

 published, and having already, before Mr. Woods's paper reached 

 me, selected this name for the ' Challenger ' species, I have thought 

 it better to retain it, the more so that, should the Australian 

 fossil prove to be the same as the species living in deep water 

 off Sydney, the substitution of another name would be a pity and 

 would tend to create confusion. 



Since writing the above, and just as this paper is leaving my 

 hands, I have received from Prof. v. Martens with his accus- 

 tomed kindness the number of his 'Conchologische Mittheilungen' 

 (vol. II. pts. 1 & 2), issued for December 1881, containing his 

 beal^tifully illustrated description of Fusus pagoda, Lesson 

 (p. 106, pi. xxi. f. 4.), which he attaches to a new subgenus of Pleu- 

 rotoma under the name of Cohomharium, enriching the group with 

 a new species P. (C.) spinicincta (p. 105, pi. xxi. f. 1-3), got by 

 the German war-vessel ' Gazelle ' in 76 fathoms, from (apparently) 

 a spot some 500 miles N. by E., on the same east coast of Australia 

 from which the 'Challenger' specimens come. At p. 122, Mr. 

 G. Schacko (pi. xxiv. f. 1, 2) gives details of the radula, on the 

 peculiarities of which the subgenus is mainly based. The opinion 

 of Prof. V. Martens is of course of commanding weight ; and if I 

 have not followed him here, it is merely because I see that not 

 F. pagoddides alone, but many of the forms grouped ujider Tro- 

 phon will have to share the fate of -F. pagoda, Less., whatever that 

 may ultimately be. 



In the meantime 1 content myself with calling attention to 

 this increase in the number of those forms which gather round 

 Lesson's remarkable and beautiful species. \Vith this increase 

 in their number, however, there comes no link of connexion be- 

 tween them ; for not one of the three species helps to unite the 



