318 [November, 



Pale gray; arms marked'with scattered brown spots. Oral plates not surrounded 

 with papilla?, angles acute, the distal one truncate; the posterior plate is distin- 

 guished by only a single marginal forannen. The inflexed margin of the disc is not 

 margined with papillas as in the preceding species: the oral papilla? are large, and 

 there are only three on each side : the tentacular pores have two small oblong 

 scales: the spines are in three rows, and their length is only one half the diameter 

 of the arms: the spines of the middle row are rough. This species seems very 

 similar to O. elongata Mul. 95. Ophiura elong. Say J. Ac. 5, 116. 



3. O. s i m p 1 e X , subtus pallida, supra obscura, disco scutis mediocribus, granu- 

 latis, subimbricatis tecto, radialibus paulo maioribus modice approximatis, inter- 

 stitio scutis duobus ; brachiorum scutis dorsalibus latitudine duplo brevioribus, 

 lateribus rotundatis, ventralibus quadratis angulis rotundatis, squama tentaculo- 

 rum unica ; spinis lateralibus serie 5-plici sitis, scutis buccalibus taansversis, 

 subrotundatis, postico foramine apicali notato: brachiis disci diametro V'^^ lon- 

 gioribus. Long. 4 unc. 



Pale beneath, above blackish brown ; arms marked with a few paler bands ; 

 the scales are all finely granulated, the radial ones separated by two plates. The 

 oral plates are not surrounded with papillae, and on each side there is only a sin- 

 gle oral papilla; the tentacular pores are protected with single scales, the second 

 scale being spiniform and forming the lowest of the five series of lateral spines, 

 the longest of which is scarcely equal to the diameter of the arms. 



4. O, h i s p i d a, albicans, maculis parvis nigricantibus supra adspersa, disco squa- 

 mis minutis imbricatis tecto, spinulisquebrevissimis dense hispido: scutis radiali- 

 bus elongatis, approximatis; brachiorum scutis dorsalibus latitudine triplo breviori- 

 bus extorsum subrotundatis, ventralibus quadratis, transversis, angulis rotundatis, 

 spinis lateralibus serie triplici sitis, longitudine dimidium brachiorum diametri 

 aequantibus; scutis buccalibus rhomboideis, postico foramine apicali notato, bra- 

 chiis disci diametro lO'fs longioribus. Long. 6 unc. 



Only a single specimen found very distinct by the hispid surface of the disc. 

 The oral plates have on each side 3 or 4 tolerably large papillas. The tentacular 

 pores have two small elliptical scales. 



Besides the species described above, a large one was given me by Dr. Duchas- 

 saing, which strongly resembles O. serpentaria, from the West Indies. The dor- 

 sal plates of the arms were a little more transverse, and the buccal plates more 

 rounded. Not having had sufficient opportunity for examining whether these 

 should be considered as specific differences, I forbear for the present expressing 

 an opinion on this specimen. 



OPHIOTIIRIX, Mul. 



O.spiculata, supra obscura, subtus pallido-maculata,disco confertim spiculato, 

 spiculis echinatis, spinis maioribus versus medium intermixtis, scutis radialibus 

 magnis, triansularibus, granulatis, rarius spiculatis, ansulo brachiali albicante, 

 per paria approximatis, brachiorum scutis dorsalibus sub-carinatis vix transver- 

 sis, angulis lateralibus acutis, margine externo fortiter rotundato, ventralibus 

 quadratis sub-transversis, lateribus rotundatis, spinis lateralibus serie 7P''ci sitis, 

 serie superiore vix breviore; oris scutis transversis, angulis lateralibus rotundatis, 

 externo acuminato, brachiis diametro disci Git's longioribus. Long. 4 5 unc. 

 This species is very variable as regards the closeness of the numerous short 



