72 THE VOYAGE OF H.M.S. CHALLENGER. 



36. Trochus (Solariella) prodictus, Fischer. 



Margarita angulata, A. Adams (not of Sowerby, Eicbwald, or Munster), Proc. Zool. Soc. Lond., 1851, 



p. 190, sp. 18. 

 Monilea {Solariella) angulata, A. Adams, Genera, p. 431. 



Minolta angulata, Angas, Port Jackson Moll., Proc. Zool. Soc. Lond., 1867, p. 217, No. 195. 

 Trochus prodictus, Fischer in Kiener's Iconog., p. 395, sp. 240, pi. cxviii. fig. 1. 



April 17-18, 1874. Port Jackson, Sydney. 2 to 10 fathoms. 



Habitat. — Sandwich Islands (Adams), Port Jackson (Angas). 



Solariella is a MS. generic name of Searles Wood, published in his Catalogue of Crag. Moll, 

 in 1842, and suppressed by him as a mere synonym of Margarita in his Crag. Moll. (Pal. Soc), 

 vol. i. p. 134. Adams revives it in his " Genera " as a subgenus of Monilea, with which it has 

 nothing specially to do ; but it may not be amiss to retain it for the Australian group of Trochidas, 

 whose brilliant colours distinguish them from the Margaritas. As for the name Minolta proposed 

 by Adams in the Annals and Magazine of Natural History for 1860, p. 336, apart from the very 

 serious objection of its similarity to Monilea, there really is not room for it as distinct from Solariella, 

 the connecting links between these being already too numerous as species are now grouped. (See 

 Carpenter, Mollusca, West Coast of North America, British Association Report, 1 863, p. 653.) 



A good deal of confusion exists in collections between this species and Trochus delicatus, A. Ad., 

 which is more tumid, especially on the base, larger, with a smaller umbilicus, higher, with a narrower 

 shoulder below the suture, and the angle there not so sharp. 



The propriety of the change in Adams' name will be variously estimated in accordance with the 

 importance attached to the subdivisions of Linne's genus. Of course any one who esteems them as 

 worse than useless can have no hesitation in accepting Fischer's name. 



37. Trochus (Solariella) vitiligineus, Menke. 



Trochus vitiligineus, Menke, Moll. Nov. Holl., p. 18, No. 73. 



„ „ Philippi, Conch. Cab. (ed. Kiister), p. 176, sp. 213, pi. xxviii. fig. 2. 



Margarita nitiligineus (sic), A. Adams, Proc. Zool. Soc. Lond., 1851, p. 190, No. 12. 

 Monilea (Solariella) vitiliginea, Adams, Genera, vol. i. p. 431. 

 Minolta vitiliginea, Angas, South Austr. Moll, Proc. Zool. Soc. Lond., 1865, p. 182, No. 167. 



„ ,, Angas, Port Jackson Moll., Proc. Zool. Soc. Lond., 1867, p. 217, No. 194. 



Trochus vitiligineus, Lischke, Japan. Meer. Conch., vol. ii. p. 86. 



,, „ Fischer in Kiener's Iconog., p. 397, sp. 242, pi. cxviii. fig. 3. 



April 17-18, 1874. Port Jackson, Sydney. 2 to 10 fathoms. 



Station 186. September 8, 1874. Lat. 10° 30' S., long. 142° 18' E. Wednesday 

 Island, Cape York, North-Eastern Australia. 8 fathoms. Coral mud. 



Habitat. — From St Vincent's Gulf in South Australia (Angas), to the Philippines and 

 Japan (Lischke). 



