TURRIS NEGLECTA. 259 



TURRIDyE. 



TROPHOSOME. — Htdrocaulus rudimental or developed. Htdranths with 

 scattered filiforin tentacles. 



GONOSOME. — GoNOPHORES medusiform; planoblasts with simple radiatiii"- 

 canals, and simple marginal tentacles. 



TURRIS, Lesson. 



Name. — From Titrris, a tower, in allusion to tlic form of the umbrella. 



TROPHOSOME. — HTDUOPnYTOX consisting of a creeping filiform htdroriiiza 

 and a rudimental htdkocaulus, the whole invested by a perisauc. Htdranths 

 claviform. 



GONOSOME. — GoNOPHORES phanerocodonic. Umbrella of mature medusa sub- 

 cylindrical ; manubrium massive, with a four-lipped mouth ; radiating canals four ; 

 marginal tentacles numerous, each with a bulbous base having a distinct ocellus. 



The gonosome of this genus has long been known, but it is only within a few years that its 

 trophosome has been detected. For the discovery of the trophosome of Turris, we are indebtcil 

 to Gosse, who found that the eggs discharged from the medusa to which Lesson assigned the 

 name of Turris ncr/lecfa, developed themselves into a CIava-\\kQ trophosome, an observation 

 which was afterwards confirmed and extended by Strethill Wright. 



Turris ^'eglecta, Lesson. 



Turris neglecta (planoblast), — Lesson, Prodromus (1837), No. 38 ; Hist. Nat. des Acad. 



(1843), p. 28-1. Forbes, British Medusae, p. 23, pi. iii, fig. 2. 



(Plauoblast and trophosome), Gosse, Devonshire Coast, p. 348, 



pi. xiii, figs. 6 — 10. 



Clavula Gossii (trophosome), Strelhill Vi'r'njht. In Ediub. New Pliil. Journ., for July, 1859, 



pi. viii, fig. 1. 



34 



