SHALLOW-WATER STARFISHES 2O9 



they are scattered over the surface, somwehat in quincunx, but in 

 some parts seem to belong to about twelve to sixteen rows. 



The dorsal ossicles are strong, deeply lobulate, and openly reticu- 

 late, leaving many papular areas, with numerous small papulae. The 

 madreporic plate in this specimen is double, the two parts nearly 

 equal, rounded, and a little separated, covered with small spinules. 

 The superomarginal plates are scarcely distinguishable from the 

 dorsal ossicles, except distally ; they mostly bear one or two conical 

 spines. The inferomarginals are a little larger, strongly lobed, and 

 often bear two spines not distinctly larger than the dorsals. A row 

 of small interactinal ossicles, part of them bearing small spines, is 

 interpolated proximally. The adambulacral spines stand in a trans- 

 verse row of three, or sometimes four, on each plate, besides a 

 small, short one (rarely two) within the margin of the groove. They 

 are subequal, round, a little tapered, blunt, and decidedly longer than 

 the outer spines. The one next the margin of the groove is usually, 

 but not always, the longest ; the outer one is the shortest. 



This species occurs commonly from Panama to Lower California. 

 It is said to occur also at San Diego, California. 



The types were from La Paz, Gulf of California ; San Diego (Ives, 

 1891) ; Bay of Pichilinque (Ives, 1889) ; Monterey, California 

 (Ives, 1889). The latter is probably an error; it needs confirmation. 



Mr. Clark, op. cit., 1901, mentions a specimen from Puget Sound, 

 which he refers doubtfully to this species, as having the rays " long 

 (52 mm. to 62 mm.) and very slender, and though rough, they are 

 not spiny." This must be a different species or genus if it has no 

 obvious spines. 



Perhaps the locality label was erroneous, as was the case with 

 several other species in the same collection. It was not to be found 

 when I studied the collection, at Columbia University. 



Genus Henricia Gray. 



Henricia GRAY, Ann. Mag. Nat. Hist., vi, p. 184, November, 1840; Synopsis 

 Starfishes, p. 5, 1866. Bell, Ann. and Mag. Nat. Hist., vr, p. 473, 1890; 

 Catal. British Echinod., p. 95, 1892. Fisher, 191 ib, p. 266. 



Rhopia (pars) GRAY, op. cit, 1866, p. 12. 



Cribella FORBES, Brit. Starfishes, p. 100, 1841, or December, 1840. 



Echinaster (pars) MULLER and TROSCHEL, April, 1840; Syst. Aster., p. 22, 

 1842. 



Linckia FORBES (non Nardo), Mem. Wern. Soc., vm, p. 120, 1839. 



IS 



