the Genera and Species of Starfish. 283 
2. Ferdina Cumingii. Yellow or brown; rays rather longer than 
the width of the body, with a central and a marginal row of larger 
rounded tubercles and some scattered smaller ones ; the larger tuber- 
cles on the sides are red when the granules are rubbed off, which 
they often are. 
Inhab. West Coast of Columbia. H. Cuming, Esq. 
b. The ambulacra with a series of very small short filiform spires 
(placed in pairs) with a parallel series of spines near them ; the rays 
Formed of longitudinal series of tubercles united by transverse ossicula ; 
dorsal wart intricate. 
* Spines near the ambulacra larger than the ambulacral ones. 
20. DactytosasTEerR, Gray. 
Rays cylindrical, nearly smooth, formed of regular oblong ossi- 
cula, each furnished with a central group of unequal short mobile 
tubercles ; dorsal wart 1. 
1. Dactylosaster cylindricus. Asterias cylindrica, Lam. Gray, 
Ency. Metrop.t. .f. . Reddish, brown marbled, rays elongated, 
cylindrical, blunt, with 8 rows of groups of spinose tubercles, 3 times 
as long as the width of the body. 
Inhab. ‘‘Isle of France.” W. E. Leach, M.D. 
2. Dactylosaster gracilis. Reddish, brown marbled, rays slender, 
four times as long as the width of the body, with 7 rows of groups 
of small spines. 
Inhab. West Coast of Columbia. H. Cuming, Esq. 
21. Tamaria, Gray. 
Rays cylindrical, formed of 7 series of granular convex roundish 
ossicula, each of the upper ones with 3 or 4 unequal and the lower 
ones with a central short blunt spine. 
1. Tamaria fusca. Brown; rays rather tapering. 
Inhab. Migupou. H. Cuming, Esq. 
22. Cristina, Gray. 
Rays cylindrical, nearly smooth, formed of rows of 3-lobed flat os- 
sicula, each furnished with a central mobile spine ; dorsal warts (1 
or 2) oblong. 
1. Cistina Columbie. Yellow, arms rather more than 4 times as 
long as the width of the body, with 7 rows of spines. 
Inhab. West Coast of Columbia. H. Cuming, Esq. 
The larger specimen has two very distinct dorsal warts, but I 
can only see one very obscure one in the smaller specimen. It may 
be a monstrosity in the large specimen. 
23. OpuiprasTER, Agassiz. 
Rays cylindrical, elongate, uniformly granular all over, without 
any spines; back with a small central group of larger tubercles; 
dorsal wart concave with radiating or twisting grooves. 
