— 6€668 Miscellaneous. 
by the ventral marginal plates, which are very distinct ; the dorsal 
marginal plates are less striking; the plates corresponding to the 
tubercles of the dorsal surface are much thickened and round. In 
diameter the specimens range from 25 to 51 millim. 
5. Tylaster Willet, named in honour of Captain Wille, is a new 
species representing a new genus of the family Asterinide, obtained 
at two stations, in 71° 25’ and 75° 12’ N. lat., and 15° 40"5 and 
3° 2’ E. long., at depths of 620 and 1200 fathoms on a clay bottom. 
Temperature —1° and —1°6 C. (=30°2 and 29°1 F.). 
Genus TYLASTER. 
Body convex, pentagonal. Arms short, robust. Skin of the back 
with no skeleton, but everywhere beset with fine isolated calcareous 
spines, between which are tentacular pores. Dorsal marginal plates 
rudimentary. Ventral marginal plates furnished with spines. The 
interbrachial space of the ventral surface has small calcareous plates 
arranged in an arched form and having one or more spines. Anus 
central. Two rows of ambulacral feet without spicules. No pedi- 
cellarie. 
Tylaster Willer. 
Body convex on both surfaces. The smaller radius is to the larger 
as 1:13. Ambulacral papille in three series, of which the inner- 
most are the longest. Ventral marginal plates furnished with three 
rows of spines. In the interbrachial space three curved rows of 
spines, with isolated spines between the rows. Back tile-red, ventral 
surface white. Anal aperture and madreporic plate yellow. The 
species is figured. 
6. Poraniomorpha rosea is another new species representing a 
new genus of Asterinide, resembling Porania at the first glance, 
but in character approaching nearer to Asterina. A single example 
of this species was taken in N. lat. 61° 41’, H. long. 3° 18':5, at a 
depth of 220 fathoms, on a bottom of mud and clay. 
Genus PoRANIOMORPHA. 
Body 5-rayed, flat below, not very convex above. Anus subcentral. 
Both upper and lower surface covered all over with fine isolated 
calcareous spines. Margins sharp, formed by the ventral marginal 
plates alone, which bear spines. The dermal skeleton on the back 
consists of small, oval, calcareous pieces, forming a close reticulation 
with extremely small meshes; on the ventral surface of oblong, flat, 
calcareous pieces forming rows. No pedicellariz ; no spicules in the 
ambulacral feet. 
Poraniomorpha rosea. 
Radii in the proportion of 1:12. On each adambulacral plate 
five spines, of which two are directed inwards into the ventral 
furrow and form one row on each side ; the other three form three 
rows outside the furrow. ‘he ventral marginal plates bear from 
