230 VERRILL 



and smaller ossicles, which bear small groups of four to seven short, 

 blunt spinules ; in the smaller size of the inferomarginal plates, and 

 their longer and larger spinules; and especially in the fewer and 

 unusually large adambulacral spines, with a pair of stout spines 

 standing on the margin of the groove, on each plate. 



TERATOLOGY. 



On the New England coast I have collected several specimens 

 with six regular rays. One of these, from off Salem, Massachusetts, 

 in shallow water, has the rays uncommonly slender and a very small 

 disk. Radii, 7 mm. and 31 mm. ; ratio, about 1 : 4.5. The dorsal 

 pseudopaxillae are very small and bear mostly only two to four spin- 

 ules which are slender, thorny and acute; many have only a single 

 spinule. The ossicles are small, slender, and form a fine-meshed 

 network. 



The adambulacral spines are elongated and slender, acute, about 

 four or five in a nearly simple row. 



The marginals of both rows are small and scarcely different from 

 the adjacent laterals and peractinals, but they form pretty regular 

 rows. 



Another specimen (Yale Mus., No. 5380), from Eastport, Maine 

 (coll. A. E. Verrill, 1870), is larger and of about the usual propor- 

 tions; radii, 13 mm. and 58 mm.; ratio, about 1 :4-5. The spinula- 

 tion is much finer than that of the typical form. The dorsal ossicles 

 are much smaller, and roundish, with small papular areas, approach- 

 ing those of var. miliaris. 



A specimen of moderate size, from Alaska, has two madreporic 

 plates, near together, both interradial; one is more coarsely spinu- 

 lated; they are about equal in size. This specimen is rather more 

 coarsely spinulated than usual, dorsally, and the adambulacral spines 

 are larger, finer, and less unequal than usual. Both rows of marginal 

 spines are unusually small, not larger than the dorso-lateral ones, and 

 scarcely distinguishable; they have few spinules. 



HENRICIA SANGUINOLENTA, Var. PECTINATTA Verrill. 

 Plate XLIX, figures I, 10 (type). 



Cribrella pectinata VERRILL, Proc. U. S. Nat Mus., xvn, p. 278, 1894. 

 Henricia sanguinolento variety C, FISHER, op. cit., ignb, p. 272, pi. LXV, fig. 2; 

 pi. LXVI, figs, i, 3, 4, 5. 



Rays five, elongated, rounded, thick at base, tapering evenly to the 

 small tips. Disk moderately swollen, the lesser to the greater radii 



