SHALLOW-WATER STARFISHES 219 



This variety often intergrades with the typical fonn and 

 with other varieties. It is, perhaps, the predominant form of the 

 species, in shallow water, when well grown, but the original form, 

 described by Dr. Stimpson, had roundish abactinal ossicles. 



In many cases the longer, lunulate ossicles show one or more 

 lines or grooves across them, apparently indicating a process of 

 dividing into two or more shorter parts. Should such a process occur 

 extensively, it would convert an individual of this variety into the 

 typical form. This may, perhaps, occur periodically, or at the times 

 of more rapid growth. 



HENRICIA LEVIUSCULA, Var. ATTENUATA (Clark). 



Cribrella leinuscula, var. attenuata H. L. Clark, Proc. Boston, See. Nat. 

 Hist., xxi.x, p. 327, 1901. 



Some specimens from Departure Bay, British Columbia, are 

 remarkable for the slendemess of the rays. The most attenuated 

 has the radii 7 mm. and 50 mm. ; ratio, 1:7. In another they are 

 9 mm. and 54 mm. ; ratio, 1:6. In the former the breadth of the 

 ray in the middle is 5 mm. ; in the latter it is 6 mm. These are, 

 therefore, much more attenuated than the one named by Dr. Clark. 



The rays are terete and evenly tapered from close to the base. 

 The dorsal pseudopaxillse are roundish, pretty uniform in size, even, 

 and crowdedly covered with minute spinules. 



The two marginal rows of plates are very evident, their plates 

 are squarish, about equal in size to dorsal ones, and covered with 

 similar spinules. One row of actinal plates, similar in size proxi- 

 mally, extends to the distal fourth of the ray; their spinules are a 

 little longer and coarser. Adambulacral spines are slender, ten to 

 twelve to a plate; the inner ones are larger. 



The color is orange and orange-red above ; yellow below. 



Departure Bay, British Columbia (C. H. Young, Geological Sur- 

 vey of Canada) ; Puget Sound (Clark) ; etc. 



HENRICIA LEVIUSCULA, var. INEQUALIS Verrill, nov. 

 Plate Lxxxvin, figures i, 10. 



The type is rather large, with five long, regularly tapered, mod- 

 erately slender rays. The radii are 15 mm. and 83 mm. ; ratio, i : 5.5. 



The dorsal surface is closely covered with small parapaxillae, mostly 

 roundish or elliptical, sometimes slightly curved, and bearing numer- 

 ous small, divergent, often stellate, very slender, partly clavate. 



