560 
ZOOLOGICAL LITERATURE. 
Cystidea. 
Hyponome sarsi, gen. et spec, nov., Lov«Sn, 1. c. p. . Its general appear- 
ance is that of a small starfish or Euryalid j disk convex ventrally, ilattened 
dorsally; rays 6, short, broad, each divided into two short dichotomous 
branches, ending in four very short rounded lobes j channels on disk forming 
tunnel-like passages leading to a mouth ; a proboscis-like funnel, interradial 
and ventral. No pinnulae. Ventral surface covered with small thiclt-set, 
irregular scales; rosette-arranged scales on dorsal surface. No trace of a 
calyx. In centre of disk a pentagonal space, studded with minute pores. 
Among the Oystideans this genus recalls the genus Ayelacrinites of Van- 
uxem, by the depressed form of the body, the scaly covering, and the flat- 
ness of the dorsal surface, devoid of anything like a stem or peduncle, as also 
by the absence of pectinated rhombs and of pinnulae. 
Hyponome shares with the surviving type of the Crinoidea the radiated 
form of the body and the simply conical unprotected funnel, and differs from 
the palaeozoic crinoids by the absence of a calyx. Cape York, Torres Straits. 
Crinoidea. 
Rhizoorinm, nov. gen., Sars, 1. c. p. 38. Columna articulata, longa, tenuis, 
canali centrali angulato perforata, apice incrassato obconico uniarticulato, 
oxtremitate inferiore nec dihitutfi nec adnata. Articuli clongati, teretes, 
superiores subcylindrici, ceteri medio magis minusve constricti extreinitati- 
bus tumidis et alternatim pttulo conipressis ita, ut axis longior faciei gle- 
noidalis extremitatis inferioris cuj usque articuli cum eodem extremitatis su- 
perioris angulum formet obliquum. Facies glenoidalis horum articulorum 
subelliptica, striis radialibus nullis, linea ornata eminente (crista articulari) 
utrinque dentata secundum axem longiorem extensa et excavationibus duabus 
rotundatis, medio confluentibus, secundum axem breviorem extensis. Cirri 
filiformes, cylindrici, articulati et velut articuli columnae calcarei, canali 
centrali circulari permeati, dichotomo-ramosi, basi crassiores sensimque 
.apicem versus maxime attenuati. Hi cirri in numero vario, semper auteni 
continue, articulorum inferiorum columnae obvii, e duobus punctis oppositi.s, 
in parte superiore tumida cujusque articuli paululum infra extremitates 
lineae glenoidalis sitis et cum iisdem articuli proximi regulariter alternanti- 
bus, prodeunt singuli (interdum duo, fortasse pro ramis unius cirri basi bi- 
partiti habendi), libere extrorsum porrecti et denique apice (saepissime in 
discum irregularem expanse, de cu j us peripheria filicula brevissima repentia 
•exeunt) alienis corporibus adnati. Extremitas libera articuli infimi columnae 
semper plures cirros emittit. Calyx apicem dilatatum columnae crassitudine 
aequans, e numero radiorum compositus miro modo variabili, saepissime 
quidem 5, baud raro autem 4 aut 6, rarissime 7. Basalia extus inconspicua 
(forsan rudimentaria et intus in spatio centrali annuli adhaesione radialium 
inlimorum format! relicto sita, cum his et inter se connata). Radialia infima 
(prima) pari modo extus baud visibilia, subtriangularia, cum columna et 
inter se connata. Badiale secundum et tertium libera, sat magna, elongata, 
compressa, subtetragona, secundum cum prinio vera articulatione (musculis 
duobus), cum tertio sutura (absque musculis) conjunctum. liadiale tertium 
non axillare. Iladii calycis scilicet non sunt divisi et quisque radius in bra- 
chium simplex continuatur ; numerus brachiorum itaque velut radiorum 
