ISTOBOIDBA 01 NORTH I'm lib \\i> akj.v - FISHJ 1 '.'•") 



burne, Antic Ocean, and ref< bis //. arctica, based on a worn specimen In 



my opinion //. arctica i- i>u t a sporadic variant ottumida with the plates and spin< 

 smaller than usual. The Attn [aland example shows thai the variation may occur 

 fur from the Arctic. Verrill distinguishes arctica also by the large number of adam- 

 bulacral Bpinelets, in "aeveral" transverse rows. But his 1 



(too tram iws Although young specimens of tumida often h one 



tnii. of Bpinelets, large examples generally have two. T. 



from the same lol as Verrill's type of arctica were recorded by me 1 91 1 . p. 278, < Jape 



tirne, Henry I > Wbolfe and 1 find no reason to consider them specifically different 

 from the very variable, unstable tun, 



Verrill also listed typical tu ■. namely, the specimen from 



Bering [aland, V Grebnitaky (Verrill, 1914, p. 229 I have an example of the same 

 lot which is referable u> tumida, 



BBNBII U m n SCUUk Stfc^M . pi l. p. 2m. 



[ncluding Henricia •■ var. lunula Verrill, 1914, p. 218, pi. 88, G 



Verrill, 1914, p. 219, pi B8, figs I, la; vai Verrill, I 



p -'-'t. pi. 5, fig. 1; pi. 11: text fig. 12; other synonyms as given in pt. l, p. . 



Aleutian Islands to Monterey Bay, Calif., in a typical form, and thence south to 

 tin- Santa Barbara Channel and Sim Diego, '"alif., the southern form- not typical. 

 The typical form is found along ahore at low tide, or in comparatively -hallow water. 

 l.ou tide to 53 fathoms. 



MIMIliU IIUIMII I form., DY84 Itl I V > i.hrr 



//• musculo dyscrita Fisher, 1911, p. 289, pi 74, figs, l 



//- '/•/ vnr. dyscrita Verrill, 1914, p 223, pi. 12, fig 



Middle .'imi southern California, offshore, 21 to s " fathoms; sand, stones, mud, 

 mid rock 



This may eventually prove to be a good deep water race of 



however rather unstable and a more conservative treatment is t insider it a form* 



//<i in some respects intermediate with 

 soman i \ i imi -• i i <, bfi< i i d a v i m 



Clark, Proc. Boston Soc. Nat. Hi-t . vol 29, 1901, p 

 pi. 2; pi. 4. fig. l 



//- //■; multispina Fisher, 1911, p. 286, pi. 72 figs l I; pi 



figs. 1,2. 



Uenricia rpiculifera Clark). Fisher, 1911, p. 2 



//■ ■•'.■■ (era Verrill, I'M l. p 220 



//■ 'il<i var. mil)' Verrill, 1914, p .'. 



From Oregon to Bering Sea, Bering Strait, the Aleutians, ami south on the 

 Asiatic side to Simushir, Kuril Islands; low tide to 238 fathoms 



_'. Figures 1 ,m,l 2, ami Plate 1 I 1' .rure- 1 ami 2, of part 1 



lent idea of tins relative of \t Verrill unfortunately figured a Bering 



Island specimen >>f which I have duplicates I, instead of ( Mark's type-, w hich he held 

 for many years These types came from P ind and are evidently not extreme 



examples of the race, Hut are probably nearer to letiuscida than is the type of mufti- 



