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. Dactylosaster, Gray. w- 



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 f us ca. Brown; rays rather tapering. 

 Inhab. Migupou. H. Cuming, Esq. 



22. Cistina, 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. 



] . Cistina Columbia. 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. Ophidiaster, 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. 



